From 22634a34f3f0af273431b2042586c1b59cd572b5 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Wed, 22 Apr 2026 13:11:02 -0400 Subject: [PATCH 01/33] progress on oOo --- .../pipeline/InstructionDispatchQueue.scala | 19 ++++++++ .../scala/RISCV/pipeline/ReorderBuffer.scala | 48 +++++++++++++++++++ 2 files changed, 67 insertions(+) create mode 100644 src/main/scala/RISCV/pipeline/InstructionDispatchQueue.scala create mode 100644 src/main/scala/RISCV/pipeline/ReorderBuffer.scala diff --git a/src/main/scala/RISCV/pipeline/InstructionDispatchQueue.scala b/src/main/scala/RISCV/pipeline/InstructionDispatchQueue.scala new file mode 100644 index 0000000..37b923b --- /dev/null +++ b/src/main/scala/RISCV/pipeline/InstructionDispatchQueue.scala @@ -0,0 +1,19 @@ +package RISCV + +import chisel3._ +import _root_.circt.stage.ChiselStage +import scala.math._ + +class InstructionQueueEntry extends Bundle { + val ready = Bool() + val instruction = UInt(32.W) + val memory_write = Bool() + val rd = UInt(32.W) + val rd_value = UInt(32.W) +} + +class InstructionDispatchQueue() extends Module { + val io = IO(new Bundle { + + }) +} \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/ReorderBuffer.scala b/src/main/scala/RISCV/pipeline/ReorderBuffer.scala new file mode 100644 index 0000000..9e6be38 --- /dev/null +++ b/src/main/scala/RISCV/pipeline/ReorderBuffer.scala @@ -0,0 +1,48 @@ +package RISCV + +import chisel3._ +import _root_.circt.stage.ChiselStage +import scala.math._ + +// class ReorderEntry extends Bundle { +// val ready = Bool() +// val instruction = UInt(32.W) +// val memory_write = Bool() +// val rd = UInt(32.W) +// val rd_value = UInt(32.W) +// } + +// class ReorderBuffer(val size: Int = 32, val key_size: Int = 5) extends Module { +// val io = IO(new Bundle { +// val empty = Output(Bool()) +// val full = Output(Bool()) + +// val head = Output(UInt(key_size.W)) + +// val push = Input(Bool()) +// val push_value = Output(ReorderEntry()) + +// val pop = Input(Bool()) +// }) + +// val buffer = RegInit(VecInit(Seq.fill(size)(ReorderEntry()))) + +// val head_pointer = RegInit(0.U(key_size.W)) +// val tail_pointer = RegInit(0.U(key_size.W)) + +// io.empty := head_pointer === tail_pointer +// io.full := head_pointer === tail_pointer - 1.U + +// io.head := buffer(head_pointer) + +// when(io.push) { +// val write_position = (head_pointer + 1.U) % size.U(key_size.W) + +// head_pointer := write_position +// buffer(write_position) := io.push_value +// } + +// when(io.pop) { +// tail_pointer := tail_pointer + 1.U +// } +// } \ No newline at end of file From 585b9a3873c96fb948a3bc43b00c3bb9a83951f8 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Thu, 21 May 2026 22:39:53 -0400 Subject: [PATCH 02/33] logging pipelined data --- .vscode/settings.json | 4 +- src/main/scala/RISCV/Decoder.scala | 6 +- src/main/scala/RISCV/Memory.scala | 1 - .../pipeline/InstructionDispatchQueue.scala | 19 ---- .../scala/RISCV/pipeline/ReorderBuffer.scala | 48 ----------- src/test/scala/RISCV/MainSpec.scala | 86 ------------------- 6 files changed, 3 insertions(+), 161 deletions(-) delete mode 100644 src/main/scala/RISCV/pipeline/InstructionDispatchQueue.scala delete mode 100644 src/main/scala/RISCV/pipeline/ReorderBuffer.scala delete mode 100644 src/test/scala/RISCV/MainSpec.scala diff --git a/.vscode/settings.json b/.vscode/settings.json index 32cfc61..dd42a44 100644 --- a/.vscode/settings.json +++ b/.vscode/settings.json @@ -1,5 +1,5 @@ { "files.watcherExclude": { - "**/target": true - } + "**/target": true + } } \ No newline at end of file diff --git a/src/main/scala/RISCV/Decoder.scala b/src/main/scala/RISCV/Decoder.scala index 2bb3cd2..8320bf1 100644 --- a/src/main/scala/RISCV/Decoder.scala +++ b/src/main/scala/RISCV/Decoder.scala @@ -3,16 +3,12 @@ package RISCV import chisel3._ import chisel3.util._ import _root_.circt.stage.ChiselStage -import upickle.default object InstructionFormat extends ChiselEnum { val R, I, S, B, U, J = Value } -/** @param width - * Bit width (default: 32 bits) - */ -class Decoder(val width: Int = 32) extends Module { +class Decoder() extends Module { val io = IO(new Bundle { val instruction = Input(UInt(32.W)); val rs1 = Output(UInt(5.W)); diff --git a/src/main/scala/RISCV/Memory.scala b/src/main/scala/RISCV/Memory.scala index 3f43b78..8f2a36d 100644 --- a/src/main/scala/RISCV/Memory.scala +++ b/src/main/scala/RISCV/Memory.scala @@ -26,7 +26,6 @@ class Memory() extends Module { }) val memory = SyncReadMem(1024, UInt(32.W)) - loadMemoryFromFileInline(memory, "program.hex") io.address_vga := 0.U io.write_vga := true.B diff --git a/src/main/scala/RISCV/pipeline/InstructionDispatchQueue.scala b/src/main/scala/RISCV/pipeline/InstructionDispatchQueue.scala deleted file mode 100644 index 37b923b..0000000 --- a/src/main/scala/RISCV/pipeline/InstructionDispatchQueue.scala +++ /dev/null @@ -1,19 +0,0 @@ -package RISCV - -import chisel3._ -import _root_.circt.stage.ChiselStage -import scala.math._ - -class InstructionQueueEntry extends Bundle { - val ready = Bool() - val instruction = UInt(32.W) - val memory_write = Bool() - val rd = UInt(32.W) - val rd_value = UInt(32.W) -} - -class InstructionDispatchQueue() extends Module { - val io = IO(new Bundle { - - }) -} \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/ReorderBuffer.scala b/src/main/scala/RISCV/pipeline/ReorderBuffer.scala deleted file mode 100644 index 9e6be38..0000000 --- a/src/main/scala/RISCV/pipeline/ReorderBuffer.scala +++ /dev/null @@ -1,48 +0,0 @@ -package RISCV - -import chisel3._ -import _root_.circt.stage.ChiselStage -import scala.math._ - -// class ReorderEntry extends Bundle { -// val ready = Bool() -// val instruction = UInt(32.W) -// val memory_write = Bool() -// val rd = UInt(32.W) -// val rd_value = UInt(32.W) -// } - -// class ReorderBuffer(val size: Int = 32, val key_size: Int = 5) extends Module { -// val io = IO(new Bundle { -// val empty = Output(Bool()) -// val full = Output(Bool()) - -// val head = Output(UInt(key_size.W)) - -// val push = Input(Bool()) -// val push_value = Output(ReorderEntry()) - -// val pop = Input(Bool()) -// }) - -// val buffer = RegInit(VecInit(Seq.fill(size)(ReorderEntry()))) - -// val head_pointer = RegInit(0.U(key_size.W)) -// val tail_pointer = RegInit(0.U(key_size.W)) - -// io.empty := head_pointer === tail_pointer -// io.full := head_pointer === tail_pointer - 1.U - -// io.head := buffer(head_pointer) - -// when(io.push) { -// val write_position = (head_pointer + 1.U) % size.U(key_size.W) - -// head_pointer := write_position -// buffer(write_position) := io.push_value -// } - -// when(io.pop) { -// tail_pointer := tail_pointer + 1.U -// } -// } \ No newline at end of file diff --git a/src/test/scala/RISCV/MainSpec.scala b/src/test/scala/RISCV/MainSpec.scala deleted file mode 100644 index 25c9932..0000000 --- a/src/test/scala/RISCV/MainSpec.scala +++ /dev/null @@ -1,86 +0,0 @@ -package RISCV - -import chisel3._ -import chisel3.simulator.scalatest.ChiselSim -import org.scalatest.freespec.AnyFreeSpec -import org.scalatest.matchers.must.Matchers -import scala.io.Source -import java.nio.file.{Files, Paths} -import java.nio.ByteBuffer -import chisel3.simulator.PeekPokeAPI.TestableRecord - -class MainSpec extends AnyFreeSpec with Matchers with ChiselSim { - "Main should execute Store and Load Instructions correctly" in { - simulate(new Main()) { dut => - // Load hex file, one instruction per line - val instructions = Source - .fromFile("./programs/hello.hex") - .getLines() - .filter(_.trim.nonEmpty) - .map(line => java.lang.Long.parseLong(line.trim, 16)) - .toSeq - - dut.io.debug_write.poke(true.B) - - instructions.zipWithIndex.foreach { case (instr, idx) => - dut.io.debug_write_address.poke(idx.U) - dut.io.debug_write_data.poke(instr.U(32.W)) - dut.clock.step(1) - } - - dut.io.debug_write.poke(false.B) - dut.clock.step(1) - - dut.io.execute.poke(true.B) - dut.clock.step(64) - } - } - - // "Main should execute Store and Load Instructions correctly" in { - // simulate(new Main()) { dut => - // dut.io.debug_write.poke(true.B) - - // dut.io.debug_write_address.poke(0.U) - // dut.io.debug_write_data.poke(0x00004137L.U) - // dut.clock.step(1) - - // dut.io.debug_write_address.poke(1.U) - // dut.io.debug_write_data.poke(0x000041b7L.U) - // dut.clock.step(1) - - // dut.io.debug_write_address.poke(2.U) - // dut.io.debug_write_data.poke(0x00408093L.U) - // dut.clock.step(1) - - // dut.io.debug_write_address.poke(3.U) - // dut.io.debug_write_data.poke(0x00218133L.U) - // dut.clock.step(1) - - // dut.io.debug_write_address.poke(4.U) - // dut.io.debug_write_data.poke(0x00110023L.U) - // dut.clock.step(1) - - // dut.io.debug_write_address.poke(5.U) - // dut.io.debug_write_data.poke(0xff5ff06fL.U) - // dut.clock.step(1) - - // // dut.io.debug_write_address.poke(0.U) - // // dut.io.debug_write_data.poke(0b000000000111_00000_000_00001_0010011.U) // ADDI - // // dut.clock.step(1) - - // // dut.io.debug_write_address.poke(1.U) - // // dut.io.debug_write_data.poke(0b0000000_00001_00000_010_00000_0100011.U) // SW - // // dut.clock.step(1) - - // // dut.io.debug_write_address.poke(2.U) - // // dut.io.debug_write_data.poke(0b000000000000_00000_010_00010_0000011.U) // LW - // // dut.clock.step(1) - - // dut.io.debug_write.poke(false.B) - // dut.clock.step(1) - - // dut.io.execute.poke(true.B) - // dut.clock.step(24) - // } - // } -} From 2e227d7abef90bac1ee9754d068001454431ac01 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Thu, 21 May 2026 22:55:29 -0400 Subject: [PATCH 03/33] execute stage --- disabled-tests/MainSpec.scala | 86 +++++++++++++++++++ src/main/resources/program.asm | 4 + src/main/resources/program.hex | 4 + src/main/scala/RISCV/Core.scala | 84 ++++++++++++++++++ .../scala/RISCV/pipeline/DecoderStage.scala | 49 +++++++++++ .../scala/RISCV/pipeline/ExecuteStage1.scala | 29 +++++++ src/main/scala/RISCV/pipeline/ReadStage.scala | 35 ++++++++ src/test/scala/RISCV/CoreSpec.scala | 37 ++++++++ 8 files changed, 328 insertions(+) create mode 100644 disabled-tests/MainSpec.scala create mode 100644 src/main/resources/program.asm create mode 100644 src/main/resources/program.hex create mode 100644 src/main/scala/RISCV/Core.scala create mode 100644 src/main/scala/RISCV/pipeline/DecoderStage.scala create mode 100644 src/main/scala/RISCV/pipeline/ExecuteStage1.scala create mode 100644 src/main/scala/RISCV/pipeline/ReadStage.scala create mode 100644 src/test/scala/RISCV/CoreSpec.scala diff --git a/disabled-tests/MainSpec.scala b/disabled-tests/MainSpec.scala new file mode 100644 index 0000000..25c9932 --- /dev/null +++ b/disabled-tests/MainSpec.scala @@ -0,0 +1,86 @@ +package RISCV + +import chisel3._ +import chisel3.simulator.scalatest.ChiselSim +import org.scalatest.freespec.AnyFreeSpec +import org.scalatest.matchers.must.Matchers +import scala.io.Source +import java.nio.file.{Files, Paths} +import java.nio.ByteBuffer +import chisel3.simulator.PeekPokeAPI.TestableRecord + +class MainSpec extends AnyFreeSpec with Matchers with ChiselSim { + "Main should execute Store and Load Instructions correctly" in { + simulate(new Main()) { dut => + // Load hex file, one instruction per line + val instructions = Source + .fromFile("./programs/hello.hex") + .getLines() + .filter(_.trim.nonEmpty) + .map(line => java.lang.Long.parseLong(line.trim, 16)) + .toSeq + + dut.io.debug_write.poke(true.B) + + instructions.zipWithIndex.foreach { case (instr, idx) => + dut.io.debug_write_address.poke(idx.U) + dut.io.debug_write_data.poke(instr.U(32.W)) + dut.clock.step(1) + } + + dut.io.debug_write.poke(false.B) + dut.clock.step(1) + + dut.io.execute.poke(true.B) + dut.clock.step(64) + } + } + + // "Main should execute Store and Load Instructions correctly" in { + // simulate(new Main()) { dut => + // dut.io.debug_write.poke(true.B) + + // dut.io.debug_write_address.poke(0.U) + // dut.io.debug_write_data.poke(0x00004137L.U) + // dut.clock.step(1) + + // dut.io.debug_write_address.poke(1.U) + // dut.io.debug_write_data.poke(0x000041b7L.U) + // dut.clock.step(1) + + // dut.io.debug_write_address.poke(2.U) + // dut.io.debug_write_data.poke(0x00408093L.U) + // dut.clock.step(1) + + // dut.io.debug_write_address.poke(3.U) + // dut.io.debug_write_data.poke(0x00218133L.U) + // dut.clock.step(1) + + // dut.io.debug_write_address.poke(4.U) + // dut.io.debug_write_data.poke(0x00110023L.U) + // dut.clock.step(1) + + // dut.io.debug_write_address.poke(5.U) + // dut.io.debug_write_data.poke(0xff5ff06fL.U) + // dut.clock.step(1) + + // // dut.io.debug_write_address.poke(0.U) + // // dut.io.debug_write_data.poke(0b000000000111_00000_000_00001_0010011.U) // ADDI + // // dut.clock.step(1) + + // // dut.io.debug_write_address.poke(1.U) + // // dut.io.debug_write_data.poke(0b0000000_00001_00000_010_00000_0100011.U) // SW + // // dut.clock.step(1) + + // // dut.io.debug_write_address.poke(2.U) + // // dut.io.debug_write_data.poke(0b000000000000_00000_010_00010_0000011.U) // LW + // // dut.clock.step(1) + + // dut.io.debug_write.poke(false.B) + // dut.clock.step(1) + + // dut.io.execute.poke(true.B) + // dut.clock.step(24) + // } + // } +} diff --git a/src/main/resources/program.asm b/src/main/resources/program.asm new file mode 100644 index 0000000..8484b1f --- /dev/null +++ b/src/main/resources/program.asm @@ -0,0 +1,4 @@ +addi x1, x0, 1000 +addi x2, x0, 200 +addi x3, x1, 300 +addi x4, x1, 400 \ No newline at end of file diff --git a/src/main/resources/program.hex b/src/main/resources/program.hex new file mode 100644 index 0000000..92e322a --- /dev/null +++ b/src/main/resources/program.hex @@ -0,0 +1,4 @@ +3e800093 +0c800113 +12c08193 +19008213 \ No newline at end of file diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala new file mode 100644 index 0000000..1b7a240 --- /dev/null +++ b/src/main/scala/RISCV/Core.scala @@ -0,0 +1,84 @@ +package RISCV + +import chisel3._ +import _root_.circt.stage.ChiselStage +import scala.math._ + +class Core() extends Module { + val io = IO(new Bundle { + val execute = Input(Bool()) + + val flash = Input(Bool()) + val flash_address = Input(UInt(32.W)) + val flash_value = Input(UInt(32.W)) + }) + + val program_pointer = RegInit(0.U(32.W)) + + val registers = Module(new Registers()) + registers.io.write_enable := false.B + registers.io.write_address := 0.U(5.W) + registers.io.read_address_a := 0.U(5.W) + registers.io.read_address_b := 0.U(5.W) + registers.io.read_address_c := 0.U(5.W) + registers.io.in := 0.U(32.W) + + val memory = Module(new Memory()) + memory.io.address_1 := program_pointer + memory.io.read_1 := true.B + memory.io.write_1 := false.B + memory.io.write_value_1 := 0.U + + memory.io.address_2 := 0.U + memory.io.write_2 := 0.U + memory.io.write_value_2 := 0.U + memory.io.read_2 := 0.U + + memory.io.btns := 0.U + + val decode_stage = Module(new DecoderStage()) + decode_stage.io.instruction := memory.io.read_value_1 + + val read_stage = Module(new ReadStage()) + read_stage.io.instruction := decode_stage.io.decoded + read_stage.io.register_value_a := registers.io.out_a + read_stage.io.register_value_b := registers.io.out_b + registers.io.read_address_a := read_stage.io.register_read_a + registers.io.read_address_b := read_stage.io.register_read_b + + val execute_stage_1 = Module(new ExecuteStage1()) + execute_stage_1.io.instruction := read_stage.io.next_instruction + execute_stage_1.io.rs1 := read_stage.io.out_a + execute_stage_1.io.rs2 := read_stage.io.out_b + + when(io.execute) { + program_pointer := program_pointer + 4.U + + printf("\n\n\n=== Memory ===\n"); + printf("Program Pointer: %d\n", program_pointer); + printf("Data: %b\n", memory.io.read_value_1); + + printf("=== Decode ===\n"); + printf("Opcode: %b\n", decode_stage.io.decoded.opcode); + printf("Immediate: %b\n", decode_stage.io.decoded.immediate); + printf("Rs1: %d\n", decode_stage.io.decoded.rs1); + printf("Rs2: %d\n", decode_stage.io.decoded.rs2); + printf("Rsd: %d\n", decode_stage.io.decoded.rd); + + printf("=== Read ===\n"); + printf("A: %b\n", read_stage.io.out_a); + printf("B: %b\n", read_stage.io.out_b); + + printf("=== Execute 1 ===\n"); + printf("Out: %b\n", execute_stage_1.io.out); + }.otherwise { + printf("Loading...\n"); + + when(io.flash) { + memory.io.read_1 := false.B + memory.io.write_1 := true.B + memory.io.address_1 := io.flash_address + memory.io.write_value_1 := io.flash_value + } + } +} \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/DecoderStage.scala b/src/main/scala/RISCV/pipeline/DecoderStage.scala new file mode 100644 index 0000000..543a73c --- /dev/null +++ b/src/main/scala/RISCV/pipeline/DecoderStage.scala @@ -0,0 +1,49 @@ +package RISCV + +import chisel3._ +import _root_.circt.stage.ChiselStage +import scala.math._ + +class InstructionBundle extends Bundle { + val rs1 = UInt(5.W) + val rs2 = UInt(5.W) + val rd = UInt(5.W) + val immediate = UInt(32.W) + val opcode = UInt(7.W) + val func3 = UInt(3.W) + val func7 = UInt(7.W) +} + +class DecoderStage() extends Module { + val io = IO(new Bundle { + val instruction = Input(UInt(32.W)) + + val decoded = Output(new InstructionBundle()) + }) + + val decoder = Module(new Decoder()) + decoder.io.instruction := io.instruction + + val rs1 = RegInit(0.U(5.W)) + rs1 := decoder.io.rs1 + val rs2 = RegInit(0.U(5.W)) + rs2 := decoder.io.rs2 + val rd = RegInit(0.U(5.W)) + rd := decoder.io.rd + val immediate = RegInit(0.U(32.W)) + immediate := decoder.io.immediate + val opcode = RegInit(0.U(7.W)) + opcode := decoder.io.opcode + val func3 = RegInit(0.U(3.W)) + func3 := decoder.io.func3 + val func7 = RegInit(0.U(7.W)) + func7 := decoder.io.func7 + + io.decoded.rs1 := rs1 + io.decoded.rs2 := rs2 + io.decoded.rd := rd + io.decoded.immediate := immediate + io.decoded.opcode := opcode + io.decoded.func3 := func3 + io.decoded.func7 := func7 +} \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala new file mode 100644 index 0000000..40afa87 --- /dev/null +++ b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala @@ -0,0 +1,29 @@ +package RISCV + +import chisel3._ +import chisel3.util._ +import _root_.circt.stage.ChiselStage +import scala.math._ + +class ExecuteStage1() extends Module { + val io = IO(new Bundle { + val instruction = Input(new InstructionBundle()) + val rs1 = Input(UInt(32.W)) + val rs2 = Input(UInt(32.W)) + + val next_instruction = Output(new InstructionBundle()) + val out = Output(UInt(32.W)) + }) + + val instruction = RegInit(0.U.asTypeOf(new InstructionBundle())) + instruction := io.instruction + io.next_instruction := instruction + + io.out := 0.U + + switch(io.instruction.opcode) { + is("b000_0010011".U) { + io.out := io.rs1 + io.instruction.immediate; + } + } +} \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/ReadStage.scala b/src/main/scala/RISCV/pipeline/ReadStage.scala new file mode 100644 index 0000000..25baaad --- /dev/null +++ b/src/main/scala/RISCV/pipeline/ReadStage.scala @@ -0,0 +1,35 @@ +package RISCV + +import chisel3._ +import _root_.circt.stage.ChiselStage +import scala.math._ + +class ReadStage() extends Module { + val io = IO(new Bundle { + val instruction = Input(new InstructionBundle()) + + val register_read_a = Output(UInt(5.W)) + val register_value_a = Input(UInt(32.W)) + val register_read_b = Output(UInt(5.W)) + val register_value_b = Input(UInt(32.W)) + + val next_instruction = Output(new InstructionBundle()) + val out_a = Output(UInt(32.W)) + val out_b = Output(UInt(32.W)) + }) + + val instruction = RegInit(0.U.asTypeOf(new InstructionBundle())) + instruction := io.instruction + io.next_instruction := instruction + + val out_a = RegInit(0.U(32.W)) + val out_b = RegInit(0.U(32.W)) + out_a := io.register_value_a + out_b := io.register_value_b + + io.out_a := out_a + io.out_b := out_b + + io.register_read_a := io.instruction.rs1 + io.register_read_b := io.instruction.rs2 +} \ No newline at end of file diff --git a/src/test/scala/RISCV/CoreSpec.scala b/src/test/scala/RISCV/CoreSpec.scala new file mode 100644 index 0000000..d59f703 --- /dev/null +++ b/src/test/scala/RISCV/CoreSpec.scala @@ -0,0 +1,37 @@ +package RISCV + +import chisel3._ +import chisel3.simulator.scalatest.ChiselSim +import org.scalatest.freespec.AnyFreeSpec +import org.scalatest.matchers.must.Matchers +import scala.io.Source +import java.nio.file.{Files, Paths} +import java.nio.ByteBuffer +import chisel3.simulator.PeekPokeAPI.TestableRecord +import scala.io.Source + +class CoreSpec extends AnyFreeSpec with Matchers with ChiselSim { + "Core should execute program.hex correctly" in { + simulate(new Core()) { dut => + val path = getClass.getResource("/program.hex").getPath + val lines = Source.fromFile(path).getLines().toList + + dut.io.flash.poke(true.B) + + lines.zipWithIndex.foreach { case (line, index) => + val value = java.lang.Long.parseLong(line.trim, 16) + + dut.io.flash_address.poke((index * 4).U) + dut.io.flash_value.poke(value.U) + + dut.clock.step(1) + } + + dut.io.flash.poke(false.B) + + dut.io.execute.poke(true.B) + + dut.clock.step(4) + } + } +} From 6743f9a3e628572f82747c0a7ed4aa2eef910a1c Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Thu, 21 May 2026 23:07:21 -0400 Subject: [PATCH 04/33] write stage --- src/main/scala/RISCV/Core.scala | 13 +++++++++ .../scala/RISCV/pipeline/WriteStage.scala | 29 +++++++++++++++++++ src/test/scala/RISCV/CoreSpec.scala | 2 +- 3 files changed, 43 insertions(+), 1 deletion(-) create mode 100644 src/main/scala/RISCV/pipeline/WriteStage.scala diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index 1b7a240..db10220 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -51,6 +51,14 @@ class Core() extends Module { execute_stage_1.io.rs1 := read_stage.io.out_a execute_stage_1.io.rs2 := read_stage.io.out_b + val write_stage = Module(new WriteStage()) + write_stage.io.instruction := execute_stage_1.io.next_instruction + write_stage.io.value := execute_stage_1.io.out + + registers.io.write_enable := write_stage.io.register_write + registers.io.write_address := write_stage.io.register_address + registers.io.in := write_stage.io.register_value + when(io.execute) { program_pointer := program_pointer + 4.U @@ -71,6 +79,11 @@ class Core() extends Module { printf("=== Execute 1 ===\n"); printf("Out: %b\n", execute_stage_1.io.out); + + printf("=== Write ===\n"); + printf("Write: %b\n", write_stage.io.register_write); + printf("Address: %b\n", write_stage.io.register_address); + printf("Value: %b\n", write_stage.io.register_value); }.otherwise { printf("Loading...\n"); diff --git a/src/main/scala/RISCV/pipeline/WriteStage.scala b/src/main/scala/RISCV/pipeline/WriteStage.scala new file mode 100644 index 0000000..0f70aef --- /dev/null +++ b/src/main/scala/RISCV/pipeline/WriteStage.scala @@ -0,0 +1,29 @@ +package RISCV + +import chisel3._ +import chisel3.util._ +import _root_.circt.stage.ChiselStage +import scala.math._ + +class WriteStage() extends Module { + val io = IO(new Bundle { + val instruction = Input(new InstructionBundle()) + val value = Input(UInt(32.W)) + + val register_write = Output(Bool()) + val register_address = Output(UInt(5.W)) + val register_value = Output(UInt(32.W)) + }) + + io.register_write := false.B; + io.register_address := 0.U; + io.register_value := 0.U; + + switch(io.instruction.opcode) { + is("b000_0010011".U) { + io.register_write := true.B; + io.register_address := io.instruction.rd; + io.register_value := io.value; + } + } +} \ No newline at end of file diff --git a/src/test/scala/RISCV/CoreSpec.scala b/src/test/scala/RISCV/CoreSpec.scala index d59f703..c864046 100644 --- a/src/test/scala/RISCV/CoreSpec.scala +++ b/src/test/scala/RISCV/CoreSpec.scala @@ -31,7 +31,7 @@ class CoreSpec extends AnyFreeSpec with Matchers with ChiselSim { dut.io.execute.poke(true.B) - dut.clock.step(4) + dut.clock.step(8) } } } From b474d38b8cb9e7a30da7d9536115bcb456b6c3f0 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sat, 23 May 2026 20:06:23 -0400 Subject: [PATCH 05/33] fetch + valid --- src/main/scala/RISCV/Core.scala | 24 +++++++++++++++---- .../scala/RISCV/pipeline/DecoderStage.scala | 6 +++++ .../scala/RISCV/pipeline/ExecuteStage1.scala | 6 +++++ .../scala/RISCV/pipeline/FetchStage.scala | 24 +++++++++++++++++++ src/main/scala/RISCV/pipeline/ReadStage.scala | 6 +++++ .../scala/RISCV/pipeline/WriteStage.scala | 18 ++++++++++---- 6 files changed, 75 insertions(+), 9 deletions(-) create mode 100644 src/main/scala/RISCV/pipeline/FetchStage.scala diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index db10220..d160037 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -24,7 +24,6 @@ class Core() extends Module { registers.io.in := 0.U(32.W) val memory = Module(new Memory()) - memory.io.address_1 := program_pointer memory.io.read_1 := true.B memory.io.write_1 := false.B memory.io.write_value_1 := 0.U @@ -36,13 +35,23 @@ class Core() extends Module { memory.io.btns := 0.U + val fetch_stage = Module(new FetchStage()) + fetch_stage.io.execute := io.execute + fetch_stage.io.program_pointer := program_pointer + fetch_stage.io.memory_read_value := memory.io.read_value_1 + + memory.io.address_1 := fetch_stage.io.memory_read_address + val decode_stage = Module(new DecoderStage()) - decode_stage.io.instruction := memory.io.read_value_1 + decode_stage.io.instruction := fetch_stage.io.instruction + decode_stage.io.valid := fetch_stage.io.next_valid val read_stage = Module(new ReadStage()) read_stage.io.instruction := decode_stage.io.decoded read_stage.io.register_value_a := registers.io.out_a read_stage.io.register_value_b := registers.io.out_b + read_stage.io.valid := decode_stage.io.next_valid + registers.io.read_address_a := read_stage.io.register_read_a registers.io.read_address_b := read_stage.io.register_read_b @@ -50,10 +59,12 @@ class Core() extends Module { execute_stage_1.io.instruction := read_stage.io.next_instruction execute_stage_1.io.rs1 := read_stage.io.out_a execute_stage_1.io.rs2 := read_stage.io.out_b + execute_stage_1.io.valid := read_stage.io.next_valid val write_stage = Module(new WriteStage()) write_stage.io.instruction := execute_stage_1.io.next_instruction write_stage.io.value := execute_stage_1.io.out + write_stage.io.valid := execute_stage_1.io.next_valid registers.io.write_enable := write_stage.io.register_write registers.io.write_address := write_stage.io.register_address @@ -62,9 +73,10 @@ class Core() extends Module { when(io.execute) { program_pointer := program_pointer + 4.U - printf("\n\n\n=== Memory ===\n"); + printf("\n\n\n=== Fetch ===\n"); printf("Program Pointer: %d\n", program_pointer); - printf("Data: %b\n", memory.io.read_value_1); + printf("Data: %b\n", fetch_stage.io.instruction); + printf("Valid: %b\n", fetch_stage.io.next_valid); printf("=== Decode ===\n"); printf("Opcode: %b\n", decode_stage.io.decoded.opcode); @@ -72,18 +84,22 @@ class Core() extends Module { printf("Rs1: %d\n", decode_stage.io.decoded.rs1); printf("Rs2: %d\n", decode_stage.io.decoded.rs2); printf("Rsd: %d\n", decode_stage.io.decoded.rd); + printf("Valid: %b\n", decode_stage.io.next_valid); printf("=== Read ===\n"); printf("A: %b\n", read_stage.io.out_a); printf("B: %b\n", read_stage.io.out_b); + printf("Valid: %b\n", read_stage.io.next_valid); printf("=== Execute 1 ===\n"); printf("Out: %b\n", execute_stage_1.io.out); + printf("Valid: %b\n", execute_stage_1.io.next_valid); printf("=== Write ===\n"); printf("Write: %b\n", write_stage.io.register_write); printf("Address: %b\n", write_stage.io.register_address); printf("Value: %b\n", write_stage.io.register_value); + printf("Valid: %b\n", write_stage.io.next_valid); }.otherwise { printf("Loading...\n"); diff --git a/src/main/scala/RISCV/pipeline/DecoderStage.scala b/src/main/scala/RISCV/pipeline/DecoderStage.scala index 543a73c..0d5f9ed 100644 --- a/src/main/scala/RISCV/pipeline/DecoderStage.scala +++ b/src/main/scala/RISCV/pipeline/DecoderStage.scala @@ -17,8 +17,10 @@ class InstructionBundle extends Bundle { class DecoderStage() extends Module { val io = IO(new Bundle { val instruction = Input(UInt(32.W)) + val valid = Input(Bool()) val decoded = Output(new InstructionBundle()) + val next_valid = Output(Bool()) }) val decoder = Module(new Decoder()) @@ -46,4 +48,8 @@ class DecoderStage() extends Module { io.decoded.opcode := opcode io.decoded.func3 := func3 io.decoded.func7 := func7 + + val valid = RegInit(false.B) + valid := io.valid + io.next_valid := valid } \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala index 40afa87..756f26a 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala @@ -10,9 +10,11 @@ class ExecuteStage1() extends Module { val instruction = Input(new InstructionBundle()) val rs1 = Input(UInt(32.W)) val rs2 = Input(UInt(32.W)) + val valid = Input(Bool()) val next_instruction = Output(new InstructionBundle()) val out = Output(UInt(32.W)) + val next_valid = Output(Bool()) }) val instruction = RegInit(0.U.asTypeOf(new InstructionBundle())) @@ -26,4 +28,8 @@ class ExecuteStage1() extends Module { io.out := io.rs1 + io.instruction.immediate; } } + + val valid = RegInit(false.B) + valid := io.valid + io.next_valid := valid } \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/FetchStage.scala b/src/main/scala/RISCV/pipeline/FetchStage.scala new file mode 100644 index 0000000..0a0ef76 --- /dev/null +++ b/src/main/scala/RISCV/pipeline/FetchStage.scala @@ -0,0 +1,24 @@ +package RISCV + +import chisel3._ +import _root_.circt.stage.ChiselStage +import scala.math._ + +class FetchStage() extends Module { + val io = IO(new Bundle { + val execute = Input(Bool()) + val program_pointer = Input(UInt(32.W)) + val memory_read_value = Input(UInt(32.W)) + + val memory_read_address = Output(UInt(32.W)) + val instruction = Output(UInt(32.W)) + val next_valid = Output(Bool()) + }) + + io.memory_read_address := io.program_pointer + io.instruction := io.memory_read_value + + val valid = RegInit(false.B) + valid := io.execute + io.next_valid := valid +} \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/ReadStage.scala b/src/main/scala/RISCV/pipeline/ReadStage.scala index 25baaad..1b6d1d8 100644 --- a/src/main/scala/RISCV/pipeline/ReadStage.scala +++ b/src/main/scala/RISCV/pipeline/ReadStage.scala @@ -7,6 +7,7 @@ import scala.math._ class ReadStage() extends Module { val io = IO(new Bundle { val instruction = Input(new InstructionBundle()) + val valid = Input(Bool()) val register_read_a = Output(UInt(5.W)) val register_value_a = Input(UInt(32.W)) @@ -16,6 +17,7 @@ class ReadStage() extends Module { val next_instruction = Output(new InstructionBundle()) val out_a = Output(UInt(32.W)) val out_b = Output(UInt(32.W)) + val next_valid = Output(Bool()) }) val instruction = RegInit(0.U.asTypeOf(new InstructionBundle())) @@ -32,4 +34,8 @@ class ReadStage() extends Module { io.register_read_a := io.instruction.rs1 io.register_read_b := io.instruction.rs2 + + val valid = RegInit(false.B) + valid := io.valid + io.next_valid := valid } \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/WriteStage.scala b/src/main/scala/RISCV/pipeline/WriteStage.scala index 0f70aef..622eb92 100644 --- a/src/main/scala/RISCV/pipeline/WriteStage.scala +++ b/src/main/scala/RISCV/pipeline/WriteStage.scala @@ -9,21 +9,29 @@ class WriteStage() extends Module { val io = IO(new Bundle { val instruction = Input(new InstructionBundle()) val value = Input(UInt(32.W)) + val valid = Input(Bool()) val register_write = Output(Bool()) val register_address = Output(UInt(5.W)) val register_value = Output(UInt(32.W)) + val next_valid = Output(Bool()) }) io.register_write := false.B; io.register_address := 0.U; io.register_value := 0.U; - switch(io.instruction.opcode) { - is("b000_0010011".U) { - io.register_write := true.B; - io.register_address := io.instruction.rd; - io.register_value := io.value; + when(io.valid) { + switch(io.instruction.opcode) { + is("b000_0010011".U) { + io.register_write := true.B; + io.register_address := io.instruction.rd; + io.register_value := io.value; + } } } + + val valid = RegInit(false.B) + valid := io.valid + io.next_valid := valid } \ No newline at end of file From c8d73ada985c82dd87ced2afbba45ee1121be1ab Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 31 May 2026 06:14:24 -0400 Subject: [PATCH 06/33] fetch stage spec and halt --- src/main/scala/RISCV/Core.scala | 8 +++- .../scala/RISCV/pipeline/FetchStage.scala | 4 ++ src/main/scala/RISCV/pipeline/ReadStage.scala | 16 ++++++- src/test/scala/RISCV/FetchStageSpec.scala | 46 +++++++++++++++++++ 4 files changed, 71 insertions(+), 3 deletions(-) create mode 100644 src/test/scala/RISCV/FetchStageSpec.scala diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index d160037..167fce5 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -39,6 +39,11 @@ class Core() extends Module { fetch_stage.io.execute := io.execute fetch_stage.io.program_pointer := program_pointer fetch_stage.io.memory_read_value := memory.io.read_value_1 + fetch_stage.io.next_halting := false.B + + when(!fetch_stage.io.halting) { + program_pointer := program_pointer + 4.U + } memory.io.address_1 := fetch_stage.io.memory_read_address @@ -51,6 +56,7 @@ class Core() extends Module { read_stage.io.register_value_a := registers.io.out_a read_stage.io.register_value_b := registers.io.out_b read_stage.io.valid := decode_stage.io.next_valid + read_stage.io.next_halting := false.B registers.io.read_address_a := read_stage.io.register_read_a registers.io.read_address_b := read_stage.io.register_read_b @@ -71,8 +77,6 @@ class Core() extends Module { registers.io.in := write_stage.io.register_value when(io.execute) { - program_pointer := program_pointer + 4.U - printf("\n\n\n=== Fetch ===\n"); printf("Program Pointer: %d\n", program_pointer); printf("Data: %b\n", fetch_stage.io.instruction); diff --git a/src/main/scala/RISCV/pipeline/FetchStage.scala b/src/main/scala/RISCV/pipeline/FetchStage.scala index 0a0ef76..aa50333 100644 --- a/src/main/scala/RISCV/pipeline/FetchStage.scala +++ b/src/main/scala/RISCV/pipeline/FetchStage.scala @@ -13,11 +13,15 @@ class FetchStage() extends Module { val memory_read_address = Output(UInt(32.W)) val instruction = Output(UInt(32.W)) val next_valid = Output(Bool()) + val halting = Output(Bool()) + val next_halting = Input(Bool()) }) io.memory_read_address := io.program_pointer io.instruction := io.memory_read_value + io.halting := io.next_halting || !io.execute + val valid = RegInit(false.B) valid := io.execute io.next_valid := valid diff --git a/src/main/scala/RISCV/pipeline/ReadStage.scala b/src/main/scala/RISCV/pipeline/ReadStage.scala index 1b6d1d8..7504822 100644 --- a/src/main/scala/RISCV/pipeline/ReadStage.scala +++ b/src/main/scala/RISCV/pipeline/ReadStage.scala @@ -15,10 +15,24 @@ class ReadStage() extends Module { val register_value_b = Input(UInt(32.W)) val next_instruction = Output(new InstructionBundle()) + val next_valid = Output(Bool()) + val halting = Output(Bool()) + val next_halting = Input(Bool()) + val out_a = Output(UInt(32.W)) val out_b = Output(UInt(32.W)) - val next_valid = Output(Bool()) }) + + val rd_0 = RegInit(0.U(5.W)) + val rd_1 = RegInit(0.U(5.W)) + + rd_0 := io.instruction.rd + rd_1 := rd_0 + + // val halt = io.next_halting && () + val halt = io.next_halting + + io.halting := halt val instruction = RegInit(0.U.asTypeOf(new InstructionBundle())) instruction := io.instruction diff --git a/src/test/scala/RISCV/FetchStageSpec.scala b/src/test/scala/RISCV/FetchStageSpec.scala new file mode 100644 index 0000000..285c477 --- /dev/null +++ b/src/test/scala/RISCV/FetchStageSpec.scala @@ -0,0 +1,46 @@ +package RISCV + +import chisel3._ +import chisel3.simulator.scalatest.ChiselSim +import org.scalatest.freespec.AnyFreeSpec +import org.scalatest.matchers.must.Matchers +import scala.io.Source +import java.nio.file.{Files, Paths} +import java.nio.ByteBuffer +import chisel3.simulator.PeekPokeAPI.TestableRecord +import scala.io.Source + +class FetchStageSpec extends AnyFreeSpec with Matchers with ChiselSim { + "Fetch Stage should halt correctly" in { + simulate(new FetchStage()) { dut => + // The fetch stage halts when waiting for execute to be true form the core + // Additionally, there should be no valid result yet + dut.io.execute.poke(false.B) + dut.io.program_pointer.poke(0.U) + dut.io.memory_read_value.poke(0.U) + dut.io.next_halting.poke(false.B) + + dut.io.instruction.expect(0.U) + dut.io.next_valid.expect(false.B) + dut.io.halting.expect(true.B) + + dut.clock.step(1) + + // Now we execute, the stage is no longer halting, but no valid value yet + // We also are passing in 1 as the read memory value + dut.io.execute.poke(true.B) + dut.io.memory_read_value.poke(1.U) + + dut.io.instruction.expect(1.U) + dut.io.next_valid.expect(false.B) + dut.io.halting.expect(false.B) + + dut.clock.step(1) + + // Now value should be valid + dut.io.instruction.expect(1.U) + dut.io.next_valid.expect(true.B) + dut.io.halting.expect(false.B) + } + } +} From c6e1181ee9f5079dd49da7c06acb87bc395295c4 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 31 May 2026 06:56:59 -0400 Subject: [PATCH 07/33] flush instead of halt and now decode stage works --- src/main/scala/RISCV/Core.scala | 8 +-- .../{DecoderStage.scala => DecodeStage.scala} | 6 +- .../scala/RISCV/pipeline/FetchStage.scala | 8 +-- src/test/scala/RISCV/DecodeStageSpec.scala | 60 +++++++++++++++++++ src/test/scala/RISCV/FetchStageSpec.scala | 49 ++++++++++++--- 5 files changed, 110 insertions(+), 21 deletions(-) rename src/main/scala/RISCV/pipeline/{DecoderStage.scala => DecodeStage.scala} (91%) create mode 100644 src/test/scala/RISCV/DecodeStageSpec.scala diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index 167fce5..910a787 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -39,15 +39,13 @@ class Core() extends Module { fetch_stage.io.execute := io.execute fetch_stage.io.program_pointer := program_pointer fetch_stage.io.memory_read_value := memory.io.read_value_1 - fetch_stage.io.next_halting := false.B + fetch_stage.io.flush := false.B - when(!fetch_stage.io.halting) { - program_pointer := program_pointer + 4.U - } + program_pointer := program_pointer + 4.U memory.io.address_1 := fetch_stage.io.memory_read_address - val decode_stage = Module(new DecoderStage()) + val decode_stage = Module(new DecodeStage()) decode_stage.io.instruction := fetch_stage.io.instruction decode_stage.io.valid := fetch_stage.io.next_valid diff --git a/src/main/scala/RISCV/pipeline/DecoderStage.scala b/src/main/scala/RISCV/pipeline/DecodeStage.scala similarity index 91% rename from src/main/scala/RISCV/pipeline/DecoderStage.scala rename to src/main/scala/RISCV/pipeline/DecodeStage.scala index 0d5f9ed..5db5096 100644 --- a/src/main/scala/RISCV/pipeline/DecoderStage.scala +++ b/src/main/scala/RISCV/pipeline/DecodeStage.scala @@ -14,13 +14,15 @@ class InstructionBundle extends Bundle { val func7 = UInt(7.W) } -class DecoderStage() extends Module { +class DecodeStage() extends Module { val io = IO(new Bundle { val instruction = Input(UInt(32.W)) val valid = Input(Bool()) val decoded = Output(new InstructionBundle()) val next_valid = Output(Bool()) + + val flush = Input(Bool()) }) val decoder = Module(new Decoder()) @@ -51,5 +53,5 @@ class DecoderStage() extends Module { val valid = RegInit(false.B) valid := io.valid - io.next_valid := valid + io.next_valid := valid && !io.flush } \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/FetchStage.scala b/src/main/scala/RISCV/pipeline/FetchStage.scala index aa50333..88ba3e2 100644 --- a/src/main/scala/RISCV/pipeline/FetchStage.scala +++ b/src/main/scala/RISCV/pipeline/FetchStage.scala @@ -13,16 +13,14 @@ class FetchStage() extends Module { val memory_read_address = Output(UInt(32.W)) val instruction = Output(UInt(32.W)) val next_valid = Output(Bool()) - val halting = Output(Bool()) - val next_halting = Input(Bool()) + + val flush = Input(Bool()) }) io.memory_read_address := io.program_pointer io.instruction := io.memory_read_value - io.halting := io.next_halting || !io.execute - val valid = RegInit(false.B) valid := io.execute - io.next_valid := valid + io.next_valid := valid && !io.flush } \ No newline at end of file diff --git a/src/test/scala/RISCV/DecodeStageSpec.scala b/src/test/scala/RISCV/DecodeStageSpec.scala new file mode 100644 index 0000000..257f87a --- /dev/null +++ b/src/test/scala/RISCV/DecodeStageSpec.scala @@ -0,0 +1,60 @@ +package RISCV + +import chisel3._ +import chisel3.simulator.scalatest.ChiselSim +import org.scalatest.freespec.AnyFreeSpec +import org.scalatest.matchers.must.Matchers +import scala.io.Source +import java.nio.file.{Files, Paths} +import java.nio.ByteBuffer +import chisel3.simulator.PeekPokeAPI.TestableRecord +import scala.io.Source + +class DecodeStageSpec extends AnyFreeSpec with Matchers with ChiselSim { + "Decode stage valid and decode" in { + simulate(new DecodeStage()) { dut => + // Data not valid yet + dut.io.instruction.poke(0.U) + dut.io.valid.poke(false.B) + dut.io.flush.poke(false.B) + + dut.io.next_valid.expect(false.B) + + dut.clock.step(1) + + // Now valid input but output not valid yet + dut.io.instruction.poke(0x06400093L.U) // addi x1, x0, 100 + dut.io.valid.poke(true.B) + + dut.io.next_valid.expect(false.B) + + dut.clock.step(1) + + // Now decode is valid + dut.io.instruction.poke(0.U) + dut.io.valid.poke(false.B) + + dut.io.decoded.rd.expect(1.U) + dut.io.decoded.rs1.expect(0.U) + dut.io.decoded.immediate.expect(100.U) + dut.io.decoded.opcode.expect(0b0010011L.U) + dut.io.next_valid.expect(true.B) + } + } + + "Decode stage flush" in { + simulate(new DecodeStage()) { dut => + // Start with value to decode + dut.io.instruction.poke(0x06400093L.U) // addi x1, x0, 100 + dut.io.valid.poke(true.B) + dut.io.flush.poke(false.B) + + dut.clock.step(1) + + // Watchout the value should be valid but we're flushing! + dut.io.flush.poke(true.B) + + dut.io.next_valid.expect(false.B) + } + } +} diff --git a/src/test/scala/RISCV/FetchStageSpec.scala b/src/test/scala/RISCV/FetchStageSpec.scala index 285c477..44c692e 100644 --- a/src/test/scala/RISCV/FetchStageSpec.scala +++ b/src/test/scala/RISCV/FetchStageSpec.scala @@ -11,36 +11,67 @@ import chisel3.simulator.PeekPokeAPI.TestableRecord import scala.io.Source class FetchStageSpec extends AnyFreeSpec with Matchers with ChiselSim { - "Fetch Stage should halt correctly" in { + "Fetch stage valid and fetch" in { simulate(new FetchStage()) { dut => - // The fetch stage halts when waiting for execute to be true form the core - // Additionally, there should be no valid result yet + // Execute is not set yet, so the data should not be valid dut.io.execute.poke(false.B) dut.io.program_pointer.poke(0.U) dut.io.memory_read_value.poke(0.U) - dut.io.next_halting.poke(false.B) + dut.io.flush.poke(false.B) + dut.io.memory_read_address.expect(0.U) dut.io.instruction.expect(0.U) dut.io.next_valid.expect(false.B) - dut.io.halting.expect(true.B) dut.clock.step(1) - // Now we execute, the stage is no longer halting, but no valid value yet - // We also are passing in 1 as the read memory value + // Now we trigger execute and pass in a data value dut.io.execute.poke(true.B) dut.io.memory_read_value.poke(1.U) + dut.io.memory_read_address.expect(0.U) dut.io.instruction.expect(1.U) dut.io.next_valid.expect(false.B) - dut.io.halting.expect(false.B) dut.clock.step(1) // Now value should be valid + dut.io.memory_read_address.expect(0.U) + dut.io.instruction.expect(1.U) + dut.io.next_valid.expect(true.B) + } + } + + "Fetch stage flush" in { + simulate(new FetchStage()) { dut => + // Start with execute triggered + dut.io.execute.poke(true.B) + dut.io.program_pointer.poke(0.U) + dut.io.memory_read_value.poke(0.U) + dut.io.flush.poke(false.B) + + dut.io.memory_read_address.expect(0.U) + dut.io.instruction.expect(0.U) + dut.io.next_valid.expect(false.B) + + dut.clock.step(1) + + // Watchout the value should be valid but we're flushing! + dut.io.flush.poke(true.B) + dut.io.memory_read_value.poke(1.U) + + dut.io.memory_read_address.expect(0.U) + dut.io.instruction.expect(1.U) + dut.io.next_valid.expect(false.B) + + dut.clock.step(1) + + // Now no longer flush and data should be valid again + dut.io.flush.poke(false.B) + + dut.io.memory_read_address.expect(0.U) dut.io.instruction.expect(1.U) dut.io.next_valid.expect(true.B) - dut.io.halting.expect(false.B) } } } From 5ab714280311f087af479dc3cf728f2807cf3556 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 31 May 2026 06:59:34 -0400 Subject: [PATCH 08/33] comment core --- src/main/scala/RISCV/Core.scala | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index 910a787..edc3929 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -35,19 +35,24 @@ class Core() extends Module { memory.io.btns := 0.U + // ==== FETCH ==== + val fetch_stage = Module(new FetchStage()) fetch_stage.io.execute := io.execute fetch_stage.io.program_pointer := program_pointer fetch_stage.io.memory_read_value := memory.io.read_value_1 fetch_stage.io.flush := false.B - program_pointer := program_pointer + 4.U - memory.io.address_1 := fetch_stage.io.memory_read_address + + // ==== DECODE ==== val decode_stage = Module(new DecodeStage()) decode_stage.io.instruction := fetch_stage.io.instruction decode_stage.io.valid := fetch_stage.io.next_valid + decode_stage.io.flush := false.B + + // ==== READ ==== val read_stage = Module(new ReadStage()) read_stage.io.instruction := decode_stage.io.decoded @@ -59,12 +64,22 @@ class Core() extends Module { registers.io.read_address_a := read_stage.io.register_read_a registers.io.read_address_b := read_stage.io.register_read_b + // ==== EXECUTE 1 ==== + val execute_stage_1 = Module(new ExecuteStage1()) execute_stage_1.io.instruction := read_stage.io.next_instruction execute_stage_1.io.rs1 := read_stage.io.out_a execute_stage_1.io.rs2 := read_stage.io.out_b execute_stage_1.io.valid := read_stage.io.next_valid + when(io.execute) { + program_pointer := program_pointer + 4.U + } + + // ==== EXECUTE 2 ==== + + // ==== WRITE ==== + val write_stage = Module(new WriteStage()) write_stage.io.instruction := execute_stage_1.io.next_instruction write_stage.io.value := execute_stage_1.io.out From 9717e9f03f9ee073c185cf2df5b8b481d47ee471 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 31 May 2026 07:00:40 -0400 Subject: [PATCH 09/33] read stage flush --- src/main/scala/RISCV/Core.scala | 2 +- src/main/scala/RISCV/pipeline/ReadStage.scala | 11 +++-------- 2 files changed, 4 insertions(+), 9 deletions(-) diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index edc3929..8355310 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -59,7 +59,7 @@ class Core() extends Module { read_stage.io.register_value_a := registers.io.out_a read_stage.io.register_value_b := registers.io.out_b read_stage.io.valid := decode_stage.io.next_valid - read_stage.io.next_halting := false.B + read_stage.io.flush := false.B registers.io.read_address_a := read_stage.io.register_read_a registers.io.read_address_b := read_stage.io.register_read_b diff --git a/src/main/scala/RISCV/pipeline/ReadStage.scala b/src/main/scala/RISCV/pipeline/ReadStage.scala index 7504822..cc7c7ec 100644 --- a/src/main/scala/RISCV/pipeline/ReadStage.scala +++ b/src/main/scala/RISCV/pipeline/ReadStage.scala @@ -16,8 +16,8 @@ class ReadStage() extends Module { val next_instruction = Output(new InstructionBundle()) val next_valid = Output(Bool()) - val halting = Output(Bool()) - val next_halting = Input(Bool()) + + val flush = Input(Bool()) val out_a = Output(UInt(32.W)) val out_b = Output(UInt(32.W)) @@ -28,11 +28,6 @@ class ReadStage() extends Module { rd_0 := io.instruction.rd rd_1 := rd_0 - - // val halt = io.next_halting && () - val halt = io.next_halting - - io.halting := halt val instruction = RegInit(0.U.asTypeOf(new InstructionBundle())) instruction := io.instruction @@ -51,5 +46,5 @@ class ReadStage() extends Module { val valid = RegInit(false.B) valid := io.valid - io.next_valid := valid + io.next_valid := valid && !io.flush } \ No newline at end of file From 75a2ee65975f435278b7d67b4d10967069e04461 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 31 May 2026 07:22:41 -0400 Subject: [PATCH 10/33] working jump flish --- src/main/scala/RISCV/Core.scala | 20 ++++++++++++++----- .../scala/RISCV/pipeline/DecodeStage.scala | 10 ++++++++-- .../scala/RISCV/pipeline/ExecuteStage1.scala | 20 ++++++++++++++++--- .../scala/RISCV/pipeline/FetchStage.scala | 9 +++++++-- src/main/scala/RISCV/pipeline/ReadStage.scala | 10 ++++++++-- 5 files changed, 55 insertions(+), 14 deletions(-) diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index 8355310..88ffd8e 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -41,7 +41,6 @@ class Core() extends Module { fetch_stage.io.execute := io.execute fetch_stage.io.program_pointer := program_pointer fetch_stage.io.memory_read_value := memory.io.read_value_1 - fetch_stage.io.flush := false.B memory.io.address_1 := fetch_stage.io.memory_read_address @@ -49,8 +48,8 @@ class Core() extends Module { val decode_stage = Module(new DecodeStage()) decode_stage.io.instruction := fetch_stage.io.instruction + decode_stage.io.instruction_pointer := fetch_stage.io.next_instruction_pointer decode_stage.io.valid := fetch_stage.io.next_valid - decode_stage.io.flush := false.B // ==== READ ==== @@ -58,8 +57,8 @@ class Core() extends Module { read_stage.io.instruction := decode_stage.io.decoded read_stage.io.register_value_a := registers.io.out_a read_stage.io.register_value_b := registers.io.out_b + read_stage.io.instruction_pointer := decode_stage.io.next_instruction_pointer read_stage.io.valid := decode_stage.io.next_valid - read_stage.io.flush := false.B registers.io.read_address_a := read_stage.io.register_read_a registers.io.read_address_b := read_stage.io.register_read_b @@ -70,10 +69,19 @@ class Core() extends Module { execute_stage_1.io.instruction := read_stage.io.next_instruction execute_stage_1.io.rs1 := read_stage.io.out_a execute_stage_1.io.rs2 := read_stage.io.out_b + execute_stage_1.io.instruction_pointer := read_stage.io.next_instruction_pointer execute_stage_1.io.valid := read_stage.io.next_valid + fetch_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush + decode_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush + read_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush + when(io.execute) { - program_pointer := program_pointer + 4.U + when(execute_stage_1.io.program_pointer_jump_flush) { + program_pointer := execute_stage_1.io.program_pointer_target + }.otherwise { + program_pointer := program_pointer + 4.U + } } // ==== EXECUTE 2 ==== @@ -98,9 +106,9 @@ class Core() extends Module { printf("=== Decode ===\n"); printf("Opcode: %b\n", decode_stage.io.decoded.opcode); printf("Immediate: %b\n", decode_stage.io.decoded.immediate); + printf("Rd: %d\n", decode_stage.io.decoded.rd); printf("Rs1: %d\n", decode_stage.io.decoded.rs1); printf("Rs2: %d\n", decode_stage.io.decoded.rs2); - printf("Rsd: %d\n", decode_stage.io.decoded.rd); printf("Valid: %b\n", decode_stage.io.next_valid); printf("=== Read ===\n"); @@ -111,6 +119,8 @@ class Core() extends Module { printf("=== Execute 1 ===\n"); printf("Out: %b\n", execute_stage_1.io.out); printf("Valid: %b\n", execute_stage_1.io.next_valid); + printf("Flush Requested: %b\n", execute_stage_1.io.program_pointer_jump_flush); + printf("Jump Target: %d\n", execute_stage_1.io.program_pointer_target); printf("=== Write ===\n"); printf("Write: %b\n", write_stage.io.register_write); diff --git a/src/main/scala/RISCV/pipeline/DecodeStage.scala b/src/main/scala/RISCV/pipeline/DecodeStage.scala index 5db5096..f847736 100644 --- a/src/main/scala/RISCV/pipeline/DecodeStage.scala +++ b/src/main/scala/RISCV/pipeline/DecodeStage.scala @@ -17,9 +17,11 @@ class InstructionBundle extends Bundle { class DecodeStage() extends Module { val io = IO(new Bundle { val instruction = Input(UInt(32.W)) + val instruction_pointer = Input(UInt(32.W)) val valid = Input(Bool()) val decoded = Output(new InstructionBundle()) + val next_instruction_pointer = Output(UInt(32.W)) val next_valid = Output(Bool()) val flush = Input(Bool()) @@ -51,7 +53,11 @@ class DecodeStage() extends Module { io.decoded.func3 := func3 io.decoded.func7 := func7 + val next_instruction_pointer = RegInit(0.U(32.W)) + next_instruction_pointer := io.instruction_pointer + io.next_instruction_pointer := next_instruction_pointer + val valid = RegInit(false.B) - valid := io.valid - io.next_valid := valid && !io.flush + valid := io.valid && !io.flush + io.next_valid := valid } \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala index 756f26a..6180b46 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala @@ -10,11 +10,15 @@ class ExecuteStage1() extends Module { val instruction = Input(new InstructionBundle()) val rs1 = Input(UInt(32.W)) val rs2 = Input(UInt(32.W)) + val instruction_pointer = Input(UInt(32.W)) val valid = Input(Bool()) val next_instruction = Output(new InstructionBundle()) val out = Output(UInt(32.W)) val next_valid = Output(Bool()) + + val program_pointer_jump_flush = Output(Bool()) + val program_pointer_target = Output(UInt(32.W)) }) val instruction = RegInit(0.U.asTypeOf(new InstructionBundle())) @@ -22,13 +26,23 @@ class ExecuteStage1() extends Module { io.next_instruction := instruction io.out := 0.U + io.program_pointer_jump_flush := false.B + io.program_pointer_target := 0.U + + when(io.valid) { + switch(io.instruction.opcode) { + is("b000_0010011".U) { // ADDI + io.out := io.rs1 + io.instruction.immediate; - switch(io.instruction.opcode) { - is("b000_0010011".U) { - io.out := io.rs1 + io.instruction.immediate; + // TODO: Temporary test + io.program_pointer_jump_flush := true.B + io.program_pointer_target := 0.U + } } } + // TODO: trigger flush when JAL or JALR or any jump + val valid = RegInit(false.B) valid := io.valid io.next_valid := valid diff --git a/src/main/scala/RISCV/pipeline/FetchStage.scala b/src/main/scala/RISCV/pipeline/FetchStage.scala index 88ba3e2..6e2aa9b 100644 --- a/src/main/scala/RISCV/pipeline/FetchStage.scala +++ b/src/main/scala/RISCV/pipeline/FetchStage.scala @@ -12,6 +12,7 @@ class FetchStage() extends Module { val memory_read_address = Output(UInt(32.W)) val instruction = Output(UInt(32.W)) + val next_instruction_pointer = Output(UInt(32.W)) val next_valid = Output(Bool()) val flush = Input(Bool()) @@ -20,7 +21,11 @@ class FetchStage() extends Module { io.memory_read_address := io.program_pointer io.instruction := io.memory_read_value + val next_instruction_pointer = RegInit(0.U(32.W)) + next_instruction_pointer := io.program_pointer + io.next_instruction_pointer := next_instruction_pointer + val valid = RegInit(false.B) - valid := io.execute - io.next_valid := valid && !io.flush + valid := io.execute && !io.flush + io.next_valid := valid } \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/ReadStage.scala b/src/main/scala/RISCV/pipeline/ReadStage.scala index cc7c7ec..8871d11 100644 --- a/src/main/scala/RISCV/pipeline/ReadStage.scala +++ b/src/main/scala/RISCV/pipeline/ReadStage.scala @@ -7,6 +7,7 @@ import scala.math._ class ReadStage() extends Module { val io = IO(new Bundle { val instruction = Input(new InstructionBundle()) + val instruction_pointer = Input(UInt(32.W)) val valid = Input(Bool()) val register_read_a = Output(UInt(5.W)) @@ -15,6 +16,7 @@ class ReadStage() extends Module { val register_value_b = Input(UInt(32.W)) val next_instruction = Output(new InstructionBundle()) + val next_instruction_pointer = Output(UInt(32.W)) val next_valid = Output(Bool()) val flush = Input(Bool()) @@ -44,7 +46,11 @@ class ReadStage() extends Module { io.register_read_a := io.instruction.rs1 io.register_read_b := io.instruction.rs2 + val next_instruction_pointer = RegInit(0.U(32.W)) + next_instruction_pointer := io.instruction_pointer + io.next_instruction_pointer := next_instruction_pointer + val valid = RegInit(false.B) - valid := io.valid - io.next_valid := valid && !io.flush + valid := io.valid && !io.flush + io.next_valid := valid } \ No newline at end of file From 583233aae93a4afa93d53ddf32ce6dc58d304cd3 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 31 May 2026 07:25:54 -0400 Subject: [PATCH 11/33] fix tests --- src/test/scala/RISCV/DecodeStageSpec.scala | 8 +++----- src/test/scala/RISCV/FetchStageSpec.scala | 18 +++--------------- 2 files changed, 6 insertions(+), 20 deletions(-) diff --git a/src/test/scala/RISCV/DecodeStageSpec.scala b/src/test/scala/RISCV/DecodeStageSpec.scala index 257f87a..7f91664 100644 --- a/src/test/scala/RISCV/DecodeStageSpec.scala +++ b/src/test/scala/RISCV/DecodeStageSpec.scala @@ -44,16 +44,14 @@ class DecodeStageSpec extends AnyFreeSpec with Matchers with ChiselSim { "Decode stage flush" in { simulate(new DecodeStage()) { dut => - // Start with value to decode + // Request Flush dut.io.instruction.poke(0x06400093L.U) // addi x1, x0, 100 dut.io.valid.poke(true.B) - dut.io.flush.poke(false.B) + dut.io.flush.poke(true.B) dut.clock.step(1) - // Watchout the value should be valid but we're flushing! - dut.io.flush.poke(true.B) - + // Value is no longer valid dut.io.next_valid.expect(false.B) } } diff --git a/src/test/scala/RISCV/FetchStageSpec.scala b/src/test/scala/RISCV/FetchStageSpec.scala index 44c692e..4466a2a 100644 --- a/src/test/scala/RISCV/FetchStageSpec.scala +++ b/src/test/scala/RISCV/FetchStageSpec.scala @@ -44,11 +44,11 @@ class FetchStageSpec extends AnyFreeSpec with Matchers with ChiselSim { "Fetch stage flush" in { simulate(new FetchStage()) { dut => - // Start with execute triggered + // Request flush dut.io.execute.poke(true.B) dut.io.program_pointer.poke(0.U) dut.io.memory_read_value.poke(0.U) - dut.io.flush.poke(false.B) + dut.io.flush.poke(true.B) dut.io.memory_read_address.expect(0.U) dut.io.instruction.expect(0.U) @@ -56,22 +56,10 @@ class FetchStageSpec extends AnyFreeSpec with Matchers with ChiselSim { dut.clock.step(1) - // Watchout the value should be valid but we're flushing! - dut.io.flush.poke(true.B) - dut.io.memory_read_value.poke(1.U) - - dut.io.memory_read_address.expect(0.U) - dut.io.instruction.expect(1.U) + // No longer valid dut.io.next_valid.expect(false.B) dut.clock.step(1) - - // Now no longer flush and data should be valid again - dut.io.flush.poke(false.B) - - dut.io.memory_read_address.expect(0.U) - dut.io.instruction.expect(1.U) - dut.io.next_valid.expect(true.B) } } } From de5eb521845e171816c601f05c77ff09b7cfbf76 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 31 May 2026 08:00:43 -0400 Subject: [PATCH 12/33] fix execute not buffering output --- src/main/scala/RISCV/Core.scala | 18 +++++++++++++----- .../scala/RISCV/pipeline/ExecuteStage1.scala | 11 +++++++---- src/main/scala/RISCV/pipeline/ReadStage.scala | 18 +++++++++++++++++- src/test/scala/RISCV/CoreSpec.scala | 2 +- 4 files changed, 38 insertions(+), 11 deletions(-) diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index 88ffd8e..674e6e9 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -72,15 +72,19 @@ class Core() extends Module { execute_stage_1.io.instruction_pointer := read_stage.io.next_instruction_pointer execute_stage_1.io.valid := read_stage.io.next_valid - fetch_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush - decode_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush - read_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush + fetch_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush || read_stage.io.raw_hazard_flush + decode_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush || read_stage.io.raw_hazard_flush + read_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush || read_stage.io.raw_hazard_flush when(io.execute) { when(execute_stage_1.io.program_pointer_jump_flush) { program_pointer := execute_stage_1.io.program_pointer_target }.otherwise { - program_pointer := program_pointer + 4.U + when(read_stage.io.raw_hazard_flush) { + program_pointer := read_stage.io.program_pointer_target + }.otherwise { + program_pointer := program_pointer + 4.U + } } } @@ -112,14 +116,18 @@ class Core() extends Module { printf("Valid: %b\n", decode_stage.io.next_valid); printf("=== Read ===\n"); + printf("Immediate: %b\n", read_stage.io.next_instruction.immediate); printf("A: %b\n", read_stage.io.out_a); printf("B: %b\n", read_stage.io.out_b); printf("Valid: %b\n", read_stage.io.next_valid); + printf("RAW Flush Requested: %b\n", read_stage.io.raw_hazard_flush); + printf("Jump Target: %d\n", read_stage.io.program_pointer_target); printf("=== Execute 1 ===\n"); + printf("Immediate: %b\n", execute_stage_1.io.next_instruction.immediate); printf("Out: %b\n", execute_stage_1.io.out); printf("Valid: %b\n", execute_stage_1.io.next_valid); - printf("Flush Requested: %b\n", execute_stage_1.io.program_pointer_jump_flush); + printf("Jump Flush Requested: %b\n", execute_stage_1.io.program_pointer_jump_flush); printf("Jump Target: %d\n", execute_stage_1.io.program_pointer_target); printf("=== Write ===\n"); diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala index 6180b46..82a44b1 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala @@ -25,18 +25,21 @@ class ExecuteStage1() extends Module { instruction := io.instruction io.next_instruction := instruction - io.out := 0.U + val out = RegInit(0.U) + out := 0.U + io.out := out + io.program_pointer_jump_flush := false.B io.program_pointer_target := 0.U when(io.valid) { switch(io.instruction.opcode) { is("b000_0010011".U) { // ADDI - io.out := io.rs1 + io.instruction.immediate; + out := io.rs1 + io.instruction.immediate; // TODO: Temporary test - io.program_pointer_jump_flush := true.B - io.program_pointer_target := 0.U + // io.program_pointer_jump_flush := true.B + // io.program_pointer_target := 0.U } } } diff --git a/src/main/scala/RISCV/pipeline/ReadStage.scala b/src/main/scala/RISCV/pipeline/ReadStage.scala index 8871d11..d6097a8 100644 --- a/src/main/scala/RISCV/pipeline/ReadStage.scala +++ b/src/main/scala/RISCV/pipeline/ReadStage.scala @@ -21,6 +21,9 @@ class ReadStage() extends Module { val flush = Input(Bool()) + val raw_hazard_flush = Output(Bool()) + val program_pointer_target = Output(UInt(32.W)) + val out_a = Output(UInt(32.W)) val out_b = Output(UInt(32.W)) }) @@ -28,8 +31,21 @@ class ReadStage() extends Module { val rd_0 = RegInit(0.U(5.W)) val rd_1 = RegInit(0.U(5.W)) - rd_0 := io.instruction.rd + rd_0 := 0.U + + when(io.valid) { + rd_0 := io.instruction.rd + } + rd_1 := rd_0 + + val raw_hazard_flush = io.valid && ((rd_0 =/= 0.U && (rd_0 === io.instruction.rs1 || rd_0 === io.instruction.rs2)) || (rd_1 =/= 0.U && (rd_1 === io.instruction.rs1 || rd_1 === io.instruction.rs2))) + io.raw_hazard_flush := raw_hazard_flush + io.program_pointer_target := 0.U + + when(raw_hazard_flush) { + io.program_pointer_target := io.instruction_pointer + } val instruction = RegInit(0.U.asTypeOf(new InstructionBundle())) instruction := io.instruction diff --git a/src/test/scala/RISCV/CoreSpec.scala b/src/test/scala/RISCV/CoreSpec.scala index c864046..5d7aa8f 100644 --- a/src/test/scala/RISCV/CoreSpec.scala +++ b/src/test/scala/RISCV/CoreSpec.scala @@ -31,7 +31,7 @@ class CoreSpec extends AnyFreeSpec with Matchers with ChiselSim { dut.io.execute.poke(true.B) - dut.clock.step(8) + dut.clock.step(16) } } } From f4870e93ba9fd65c40fffb9d382628e36fbe8cad Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 31 May 2026 09:26:50 -0400 Subject: [PATCH 13/33] implement more instructions --- .../scala/RISCV/pipeline/ExecuteStage1.scala | 119 +++++++++++++++++- 1 file changed, 114 insertions(+), 5 deletions(-) diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala index 82a44b1..f6156ed 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala @@ -34,18 +34,127 @@ class ExecuteStage1() extends Module { when(io.valid) { switch(io.instruction.opcode) { - is("b000_0010011".U) { // ADDI - out := io.rs1 + io.instruction.immediate; + // LUI + is("b0110111".U) { + out := io.instruction.immediate; + } + + // AUIPC + is("b0010111".U) { + out := io.instruction_pointer + io.instruction.immediate; + } + + // SLTI + is("b010_0010011".U) { + when(io.rs1.asSInt < io.instruction.immediate.asSInt) { + out := 1.U; + }.otherwise { + out := 0.U; + } + } + + // SLTIU + is("b011_0010011".U) { + when(io.rs1 < io.instruction.immediate) { + out := 1.U; + }.otherwise { + out := 0.U; + } + } + + // XORI + is("b100_0010011".U) { + out := io.rs1 ^ io.instruction.immediate + } + + // XORI + is("b110_0010011".U) { + out := io.rs1 | io.instruction.immediate + } + + // ANDI + is("b111_0010011".U) { + out := io.rs1 & io.instruction.immediate + } + + // ADD + is("b0000000_000_0110011".U) { + out := io.rs1 + io.rs2 + } + + // SUB + is("b0110000_000_0110011".U) { + out := io.rs1 - io.rs2 + } - // TODO: Temporary test - // io.program_pointer_jump_flush := true.B - // io.program_pointer_target := 0.U + // SLLI + is("b001_0010011".U) { + out := io.rs1 << io.instruction.immediate(5, 0) + } + + // SRLI and SRAI + is("b101_0010011".U) { + when(io.instruction.immediate(10) === 1.U) { // SRAI + out := (io.rs1.asSInt >> io.instruction.immediate(5, 0)).asUInt + }.otherwise { // SLAI + out := io.rs1 >> io.instruction.immediate(5, 0) + } + } + + // SLL + is("b001_0110011".U) { + out := io.rs1 << io.rs2(5, 0) + } + + // SRL and SRA + is("b101_0110011".U) { + when(io.instruction.immediate(10) === 1.U) { // SRA + out := (io.rs1.asSInt >> io.rs2(5, 0)).asUInt + }.otherwise { // SLA + out := io.rs1 >> io.rs2(5, 0) + } + } + + // SLT + is("b010_0110011".U) { + when(io.rs1.asSInt < io.rs2.asSInt) { + out := 1.U; + }.otherwise { + out := 0.U; + } + } + + // SLTU + is("b011_0110011".U) { + when(io.rs1 < io.rs2) { + out := 1.U; + }.otherwise { + out := 0.U; + } + } + + // XOR + is("b100_0110011".U) { + out := io.rs1 ^ io.rs2 + } + + // OR + is("b110_0110011".U) { + out := io.rs1 | io.rs2 + } + + // AND + is("b111_0110011".U) { + out := io.rs1 | io.rs2 } } } // TODO: trigger flush when JAL or JALR or any jump + // io.program_pointer_jump_flush := true.B + // io.program_pointer_target := 0.U + val valid = RegInit(false.B) valid := io.valid io.next_valid := valid From 6b2421a57e69d6013e0d1ed918e7c939f7280923 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 31 May 2026 11:03:46 -0400 Subject: [PATCH 14/33] implement jump and branch --- .../scala/RISCV/pipeline/ExecuteStage1.scala | 69 +++++++++++++++++-- 1 file changed, 64 insertions(+), 5 deletions(-) diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala index f6156ed..516a453 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala @@ -147,13 +147,72 @@ class ExecuteStage1() extends Module { is("b111_0110011".U) { out := io.rs1 | io.rs2 } - } - } - // TODO: trigger flush when JAL or JALR or any jump + // JAL + is("b1101111".U) { + out := instruction_pointer + 4.U + + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + } + + // JALR + is("b000_1100111".U) { + out := instruction_pointer + 4.U + + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (io.rs1 + io.instruction.immediate.asSInt).asUInt & 0xFFFFFFFEL.U + } + + // BEQ + is("b000_110011".U) { + when(io.rs1 === io.rs2) { + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + } + } + + // BNEQ + is("b001_110011".U) { + when(io.rs1 =/= io.rs2) { + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + } + } + + // BLT + is("b100_110011".U) { + when(io.rs1.asSInt < io.rs2.asSInt) { + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + } + } + + // BLTU + is("b110_110011".U) { + when(io.rs1 < io.rs2) { + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + } + } - // io.program_pointer_jump_flush := true.B - // io.program_pointer_target := 0.U + // BGE + is("b101_110011".U) { + when(io.rs1.asSInt >= io.rs2.asSInt) { + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + } + } + + // BGEU + is("b111_110011".U) { + when(io.rs1 >= io.rs2) { + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + } + } + } + } val valid = RegInit(false.B) valid := io.valid From 4e0371f114b655eb072f8270358a941803f73b05 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Tue, 2 Jun 2026 08:05:41 -0400 Subject: [PATCH 15/33] fixing write and progress on execute 2 --- src/main/scala/RISCV/Core.scala | 30 ++++++--- .../scala/RISCV/pipeline/ExecuteStage1.scala | 61 +++++++++++++------ .../scala/RISCV/pipeline/WriteStage.scala | 52 +++++++++++++++- src/test/scala/RISCV/CoreSpec.scala | 30 ++++++++- 4 files changed, 145 insertions(+), 28 deletions(-) diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index 674e6e9..fb16383 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -28,10 +28,9 @@ class Core() extends Module { memory.io.write_1 := false.B memory.io.write_value_1 := 0.U - memory.io.address_2 := 0.U + memory.io.read_2 := true.B memory.io.write_2 := 0.U memory.io.write_value_2 := 0.U - memory.io.read_2 := 0.U memory.io.btns := 0.U @@ -88,14 +87,26 @@ class Core() extends Module { } } + memory.io.address_2 := execute_stage_1.io.memory_read_address + // ==== EXECUTE 2 ==== + val execute_stage_2 = Module(new ExecuteStage2()) + execute_stage_2.io.instruction := execute_stage_1.io.next_instruction + execute_stage_2.io.rs1 := execute_stage_1.io.next_rs1 + execute_stage_2.io.rs2 := execute_stage_1.io.next_rs2 + execute_stage_2.io.instruction_pointer := execute_stage_1.io.next_instruction_pointer + execute_stage_2.io.valid := execute_stage_1.io.next_valid + execute_stage_2.io.previous_out := execute_stage_1.io.out + + execute_stage_2.io.memory_read_value := memory.io.read_value_2 + // ==== WRITE ==== val write_stage = Module(new WriteStage()) - write_stage.io.instruction := execute_stage_1.io.next_instruction - write_stage.io.value := execute_stage_1.io.out - write_stage.io.valid := execute_stage_1.io.next_valid + write_stage.io.instruction := execute_stage_2.io.next_instruction + write_stage.io.value := execute_stage_2.io.out + write_stage.io.valid := execute_stage_2.io.next_valid registers.io.write_enable := write_stage.io.register_write registers.io.write_address := write_stage.io.register_address @@ -116,7 +127,6 @@ class Core() extends Module { printf("Valid: %b\n", decode_stage.io.next_valid); printf("=== Read ===\n"); - printf("Immediate: %b\n", read_stage.io.next_instruction.immediate); printf("A: %b\n", read_stage.io.out_a); printf("B: %b\n", read_stage.io.out_b); printf("Valid: %b\n", read_stage.io.next_valid); @@ -124,12 +134,18 @@ class Core() extends Module { printf("Jump Target: %d\n", read_stage.io.program_pointer_target); printf("=== Execute 1 ===\n"); - printf("Immediate: %b\n", execute_stage_1.io.next_instruction.immediate); printf("Out: %b\n", execute_stage_1.io.out); printf("Valid: %b\n", execute_stage_1.io.next_valid); + printf("Read: %b\n", execute_stage_1.io.memory_read); + printf("Read Adress: %b\n", execute_stage_1.io.memory_read_address); printf("Jump Flush Requested: %b\n", execute_stage_1.io.program_pointer_jump_flush); printf("Jump Target: %d\n", execute_stage_1.io.program_pointer_target); + printf("=== Execute 2 ===\n"); + printf("Read Value: %b\n", memory.io.read_value_2); + printf("Out: %b\n", execute_stage_2.io.out); + printf("Valid: %b\n", execute_stage_2.io.next_valid); + printf("=== Write ===\n"); printf("Write: %b\n", write_stage.io.register_write); printf("Address: %b\n", write_stage.io.register_address); diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala index 516a453..297810a 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala @@ -14,17 +14,35 @@ class ExecuteStage1() extends Module { val valid = Input(Bool()) val next_instruction = Output(new InstructionBundle()) + val next_instruction_pointer = Output(UInt(32.W)) + val next_rs1 = Output(UInt(32.W)) + val next_rs2 = Output(UInt(32.W)) val out = Output(UInt(32.W)) val next_valid = Output(Bool()) val program_pointer_jump_flush = Output(Bool()) val program_pointer_target = Output(UInt(32.W)) + + val memory_read = Output(Bool()) + val memory_read_address = Output(UInt(32.W)) }) val instruction = RegInit(0.U.asTypeOf(new InstructionBundle())) instruction := io.instruction io.next_instruction := instruction + val next_instruction_pointer = RegInit(0.U(32.W)) + next_instruction_pointer := io.instruction_pointer + io.next_instruction_pointer := next_instruction_pointer + + val rs1 = RegInit(0.U(32.W)) + rs1 := io.rs1 + io.next_rs1 := rs1 + + val rs2 = RegInit(0.U(32.W)) + rs2 := io.rs2 + io.next_rs2 := rs2 + val out = RegInit(0.U) out := 0.U io.out := out @@ -32,6 +50,9 @@ class ExecuteStage1() extends Module { io.program_pointer_jump_flush := false.B io.program_pointer_target := 0.U + io.memory_read := false.B + io.memory_read_address := 0.U + when(io.valid) { switch(io.instruction.opcode) { // LUI @@ -67,7 +88,7 @@ class ExecuteStage1() extends Module { out := io.rs1 ^ io.instruction.immediate } - // XORI + // ORI is("b110_0010011".U) { out := io.rs1 | io.instruction.immediate } @@ -150,67 +171,73 @@ class ExecuteStage1() extends Module { // JAL is("b1101111".U) { - out := instruction_pointer + 4.U + out := io.instruction_pointer + 4.U io.program_pointer_jump_flush := true.B - io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt } // JALR is("b000_1100111".U) { - out := instruction_pointer + 4.U + out := io.instruction_pointer + 4.U io.program_pointer_jump_flush := true.B - io.program_pointer_target := (io.rs1 + io.instruction.immediate.asSInt).asUInt & 0xFFFFFFFEL.U + io.program_pointer_target := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt & 0xFFFFFFFEL.U } // BEQ - is("b000_110011".U) { + is("b000_1100011".U) { when(io.rs1 === io.rs2) { io.program_pointer_jump_flush := true.B - io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt } } // BNEQ - is("b001_110011".U) { + is("b001_1100011".U) { when(io.rs1 =/= io.rs2) { io.program_pointer_jump_flush := true.B - io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt } } // BLT - is("b100_110011".U) { + is("b100_1100011".U) { when(io.rs1.asSInt < io.rs2.asSInt) { io.program_pointer_jump_flush := true.B - io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt } } // BLTU - is("b110_110011".U) { + is("b110_1100011".U) { when(io.rs1 < io.rs2) { io.program_pointer_jump_flush := true.B - io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt } } // BGE - is("b101_110011".U) { + is("b101_1100011".U) { when(io.rs1.asSInt >= io.rs2.asSInt) { io.program_pointer_jump_flush := true.B - io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt } } // BGEU - is("b111_110011".U) { + is("b111_1100011".U) { when(io.rs1 >= io.rs2) { io.program_pointer_jump_flush := true.B - io.program_pointer_target := (instruction_pointer + io.instruction.immediate.asSInt).asUInt + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt } } + + // LW + is("b010_0000011".U) { + io.memory_read := true.B + io.memory_read_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + } } } diff --git a/src/main/scala/RISCV/pipeline/WriteStage.scala b/src/main/scala/RISCV/pipeline/WriteStage.scala index 622eb92..e458acd 100644 --- a/src/main/scala/RISCV/pipeline/WriteStage.scala +++ b/src/main/scala/RISCV/pipeline/WriteStage.scala @@ -23,7 +23,57 @@ class WriteStage() extends Module { when(io.valid) { switch(io.instruction.opcode) { - is("b000_0010011".U) { + // LUI + is("b0110111".U) { + io.register_write := true.B; + io.register_address := io.instruction.rd; + io.register_value := io.value; + } + + // AUIPC + is("b0010111".U) { + io.register_write := true.B; + io.register_address := io.instruction.rd; + io.register_value := io.value; + } + + // SLTI, SLTIU, SLLI, SRLI, SRAI, XORI, ORI, ANDI + is("0010011".U) { + io.register_write := true.B; + io.register_address := io.instruction.rd; + io.register_value := io.value; + } + + // ADD, SUB + is("0110011".U) { + io.register_write := true.B; + io.register_address := io.instruction.rd; + io.register_value := io.value; + } + + // SLL, SRL, SRA, SLT, SLTU, XOR, OR, AND + is("b0110011".U) { + io.register_write := true.B; + io.register_address := io.instruction.rd; + io.register_value := io.value; + } + + // JAL + is("b1101111".U) { + io.register_write := true.B; + io.register_address := io.instruction.rd; + io.register_value := io.value; + } + + // JALR + is("b1100111".U) { + io.register_write := true.B; + io.register_address := io.instruction.rd; + io.register_value := io.value; + } + + // LW + is("0000011".U) { io.register_write := true.B; io.register_address := io.instruction.rd; io.register_value := io.value; diff --git a/src/test/scala/RISCV/CoreSpec.scala b/src/test/scala/RISCV/CoreSpec.scala index 5d7aa8f..f285e5e 100644 --- a/src/test/scala/RISCV/CoreSpec.scala +++ b/src/test/scala/RISCV/CoreSpec.scala @@ -11,9 +11,33 @@ import chisel3.simulator.PeekPokeAPI.TestableRecord import scala.io.Source class CoreSpec extends AnyFreeSpec with Matchers with ChiselSim { - "Core should execute program.hex correctly" in { + // "Core should execute program.hex correctly" in { + // simulate(new Core()) { dut => + // val path = getClass.getResource("/program.hex").getPath + // val lines = Source.fromFile(path).getLines().toList + + // dut.io.flash.poke(true.B) + + // lines.zipWithIndex.foreach { case (line, index) => + // val value = java.lang.Long.parseLong(line.trim, 16) + + // dut.io.flash_address.poke((index * 4).U) + // dut.io.flash_value.poke(value.U) + + // dut.clock.step(1) + // } + + // dut.io.flash.poke(false.B) + + // dut.io.execute.poke(true.B) + + // dut.clock.step(16) + // } + // } + + "Core should execute memory.hex correctly" in { simulate(new Core()) { dut => - val path = getClass.getResource("/program.hex").getPath + val path = getClass.getResource("/memory.hex").getPath val lines = Source.fromFile(path).getLines().toList dut.io.flash.poke(true.B) @@ -31,7 +55,7 @@ class CoreSpec extends AnyFreeSpec with Matchers with ChiselSim { dut.io.execute.poke(true.B) - dut.clock.step(16) + dut.clock.step(8) } } } From fe0ab870521c7c7e854636641c35af2650f8995b Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Tue, 2 Jun 2026 08:37:25 -0400 Subject: [PATCH 16/33] fix execute --- .../scala/RISCV/pipeline/ExecuteStage1.scala | 305 ++++++++++-------- .../scala/RISCV/pipeline/WriteStage.scala | 13 +- src/test/scala/RISCV/CoreSpec.scala | 54 ++-- 3 files changed, 194 insertions(+), 178 deletions(-) diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala index 297810a..4468d70 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala @@ -43,7 +43,7 @@ class ExecuteStage1() extends Module { rs2 := io.rs2 io.next_rs2 := rs2 - val out = RegInit(0.U) + val out = RegInit(0.U(32.W)) out := 0.U io.out := out @@ -65,110 +65,126 @@ class ExecuteStage1() extends Module { out := io.instruction_pointer + io.instruction.immediate; } - // SLTI is("b010_0010011".U) { - when(io.rs1.asSInt < io.instruction.immediate.asSInt) { - out := 1.U; - }.otherwise { - out := 0.U; + switch(io.instruction.func3) { + // SLTI + is("b010".U) { + when(io.rs1.asSInt < io.instruction.immediate.asSInt) { + out := 1.U; + }.otherwise { + out := 0.U; + } + } + + // SLTIU + is("b011".U) { + when(io.rs1 < io.instruction.immediate) { + out := 1.U; + }.otherwise { + out := 0.U; + } + } + + // XORI + is("b100".U) { + out := io.rs1 ^ io.instruction.immediate + } + + // ORI + is("b110".U) { + out := io.rs1 | io.instruction.immediate + } + + // ANDI + is("b111".U) { + out := io.rs1 & io.instruction.immediate + } } } - // SLTIU - is("b011_0010011".U) { - when(io.rs1 < io.instruction.immediate) { - out := 1.U; - }.otherwise { - out := 0.U; + is("b0110011".U) { + switch(io.instruction.func7) { + // ADD + is("b0000000".U) { + out := io.rs1 + io.rs2 + } + + // SUB + is("b0110000".U) { + out := io.rs1 - io.rs2 + } } } - // XORI - is("b100_0010011".U) { - out := io.rs1 ^ io.instruction.immediate - } - - // ORI - is("b110_0010011".U) { - out := io.rs1 | io.instruction.immediate - } - - // ANDI - is("b111_0010011".U) { - out := io.rs1 & io.instruction.immediate - } - - // ADD - is("b0000000_000_0110011".U) { - out := io.rs1 + io.rs2 - } - - // SUB - is("b0110000_000_0110011".U) { - out := io.rs1 - io.rs2 - } - - // SLLI is("b001_0010011".U) { - out := io.rs1 << io.instruction.immediate(5, 0) - } - - // SRLI and SRAI - is("b101_0010011".U) { - when(io.instruction.immediate(10) === 1.U) { // SRAI - out := (io.rs1.asSInt >> io.instruction.immediate(5, 0)).asUInt - }.otherwise { // SLAI - out := io.rs1 >> io.instruction.immediate(5, 0) + switch(io.instruction.func3) { + // SLLI + is("b001".U) { + out := io.rs1 << io.instruction.immediate(5, 0) + } + + // SRLI and SRAI + is("b101".U) { + when(io.instruction.immediate(10) === 1.U) { // SRAI + out := (io.rs1.asSInt >> io.instruction.immediate(5, 0)).asUInt + }.otherwise { // SLAI + out := io.rs1 >> io.instruction.immediate(5, 0) + } + } } } - // SLL is("b001_0110011".U) { - out := io.rs1 << io.rs2(5, 0) - } - - // SRL and SRA - is("b101_0110011".U) { - when(io.instruction.immediate(10) === 1.U) { // SRA - out := (io.rs1.asSInt >> io.rs2(5, 0)).asUInt - }.otherwise { // SLA - out := io.rs1 >> io.rs2(5, 0) - } - } - - // SLT - is("b010_0110011".U) { - when(io.rs1.asSInt < io.rs2.asSInt) { - out := 1.U; - }.otherwise { - out := 0.U; + switch(io.instruction.func3) { + // SLL + is("b001".U) { + out := io.rs1 << io.rs2(5, 0) + } + + // SRL and SRA + is("b101".U) { + when(io.instruction.immediate(10) === 1.U) { // SRA + out := (io.rs1.asSInt >> io.rs2(5, 0)).asUInt + }.otherwise { // SLA + out := io.rs1 >> io.rs2(5, 0) + } + } + + // SLT + is("b010".U) { + when(io.rs1.asSInt < io.rs2.asSInt) { + out := 1.U; + }.otherwise { + out := 0.U; + } + } + + // SLTU + is("b011".U) { + when(io.rs1 < io.rs2) { + out := 1.U; + }.otherwise { + out := 0.U; + } + } + + // XOR + is("b100".U) { + out := io.rs1 ^ io.rs2 + } + + // OR + is("b110".U) { + out := io.rs1 | io.rs2 + } + + // AND + is("b111".U) { + out := io.rs1 & io.rs2 + } } } - // SLTU - is("b011_0110011".U) { - when(io.rs1 < io.rs2) { - out := 1.U; - }.otherwise { - out := 0.U; - } - } - - // XOR - is("b100_0110011".U) { - out := io.rs1 ^ io.rs2 - } - - // OR - is("b110_0110011".U) { - out := io.rs1 | io.rs2 - } - - // AND - is("b111_0110011".U) { - out := io.rs1 | io.rs2 - } - // JAL is("b1101111".U) { out := io.instruction_pointer + 4.U @@ -178,65 +194,72 @@ class ExecuteStage1() extends Module { } // JALR - is("b000_1100111".U) { + is("b1100111".U) { out := io.instruction_pointer + 4.U io.program_pointer_jump_flush := true.B - io.program_pointer_target := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt & 0xFFFFFFFEL.U + io.program_pointer_target := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt & ~1.U(32.W) } - // BEQ - is("b000_1100011".U) { - when(io.rs1 === io.rs2) { - io.program_pointer_jump_flush := true.B - io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt + is("b1100011".U) { + switch(io.instruction.func3) { + // BEQ + is("b000".U) { + when(io.rs1 === io.rs2) { + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt + } + } + + // BNEQ + is("b001".U) { + when(io.rs1 =/= io.rs2) { + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt + } + } + + // BLT + is("b100".U) { + when(io.rs1.asSInt < io.rs2.asSInt) { + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt + } + } + + // BLTU + is("b110".U) { + when(io.rs1 < io.rs2) { + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt + } + } + + // BGE + is("b101".U) { + when(io.rs1.asSInt >= io.rs2.asSInt) { + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt + } + } + + // BGEU + is("b111".U) { + when(io.rs1 >= io.rs2) { + io.program_pointer_jump_flush := true.B + io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt + } + } } } - - // BNEQ - is("b001_1100011".U) { - when(io.rs1 =/= io.rs2) { - io.program_pointer_jump_flush := true.B - io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt - } - } - - // BLT - is("b100_1100011".U) { - when(io.rs1.asSInt < io.rs2.asSInt) { - io.program_pointer_jump_flush := true.B - io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt - } - } - - // BLTU - is("b110_1100011".U) { - when(io.rs1 < io.rs2) { - io.program_pointer_jump_flush := true.B - io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt - } - } - - // BGE - is("b101_1100011".U) { - when(io.rs1.asSInt >= io.rs2.asSInt) { - io.program_pointer_jump_flush := true.B - io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt - } - } - - // BGEU - is("b111_1100011".U) { - when(io.rs1 >= io.rs2) { - io.program_pointer_jump_flush := true.B - io.program_pointer_target := (io.instruction_pointer.zext + io.instruction.immediate.asSInt).asUInt - } - } - - // LW is("b010_0000011".U) { - io.memory_read := true.B - io.memory_read_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + switch(io.instruction.func3) { + // LW + is("b010".U) { + io.memory_read := true.B + io.memory_read_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + } + } } } } diff --git a/src/main/scala/RISCV/pipeline/WriteStage.scala b/src/main/scala/RISCV/pipeline/WriteStage.scala index e458acd..316d3be 100644 --- a/src/main/scala/RISCV/pipeline/WriteStage.scala +++ b/src/main/scala/RISCV/pipeline/WriteStage.scala @@ -38,20 +38,13 @@ class WriteStage() extends Module { } // SLTI, SLTIU, SLLI, SRLI, SRAI, XORI, ORI, ANDI - is("0010011".U) { + is("b0010011".U) { io.register_write := true.B; io.register_address := io.instruction.rd; io.register_value := io.value; } - // ADD, SUB - is("0110011".U) { - io.register_write := true.B; - io.register_address := io.instruction.rd; - io.register_value := io.value; - } - - // SLL, SRL, SRA, SLT, SLTU, XOR, OR, AND + // ADD, SUB, SLL, SRL, SRA, SLT, SLTU, XOR, OR, AND is("b0110011".U) { io.register_write := true.B; io.register_address := io.instruction.rd; @@ -73,7 +66,7 @@ class WriteStage() extends Module { } // LW - is("0000011".U) { + is("b0000011".U) { io.register_write := true.B; io.register_address := io.instruction.rd; io.register_value := io.value; diff --git a/src/test/scala/RISCV/CoreSpec.scala b/src/test/scala/RISCV/CoreSpec.scala index f285e5e..ce7bed5 100644 --- a/src/test/scala/RISCV/CoreSpec.scala +++ b/src/test/scala/RISCV/CoreSpec.scala @@ -11,33 +11,9 @@ import chisel3.simulator.PeekPokeAPI.TestableRecord import scala.io.Source class CoreSpec extends AnyFreeSpec with Matchers with ChiselSim { - // "Core should execute program.hex correctly" in { - // simulate(new Core()) { dut => - // val path = getClass.getResource("/program.hex").getPath - // val lines = Source.fromFile(path).getLines().toList - - // dut.io.flash.poke(true.B) - - // lines.zipWithIndex.foreach { case (line, index) => - // val value = java.lang.Long.parseLong(line.trim, 16) - - // dut.io.flash_address.poke((index * 4).U) - // dut.io.flash_value.poke(value.U) - - // dut.clock.step(1) - // } - - // dut.io.flash.poke(false.B) - - // dut.io.execute.poke(true.B) - - // dut.clock.step(16) - // } - // } - - "Core should execute memory.hex correctly" in { + "Core should execute program.hex correctly" in { simulate(new Core()) { dut => - val path = getClass.getResource("/memory.hex").getPath + val path = getClass.getResource("/program.hex").getPath val lines = Source.fromFile(path).getLines().toList dut.io.flash.poke(true.B) @@ -55,7 +31,31 @@ class CoreSpec extends AnyFreeSpec with Matchers with ChiselSim { dut.io.execute.poke(true.B) - dut.clock.step(8) + dut.clock.step(16) } } + + // "Core should execute memory.hex correctly" in { + // simulate(new Core()) { dut => + // val path = getClass.getResource("/memory.hex").getPath + // val lines = Source.fromFile(path).getLines().toList + + // dut.io.flash.poke(true.B) + + // lines.zipWithIndex.foreach { case (line, index) => + // val value = java.lang.Long.parseLong(line.trim, 16) + + // dut.io.flash_address.poke((index * 4).U) + // dut.io.flash_value.poke(value.U) + + // dut.clock.step(1) + // } + + // dut.io.flash.poke(false.B) + + // dut.io.execute.poke(true.B) + + // dut.clock.step(8) + // } + // } } From 1a8cb4ce36dfdd9b93819c89e169b9c50834d7c1 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Tue, 2 Jun 2026 08:40:38 -0400 Subject: [PATCH 17/33] execute 2 --- src/main/resources/memory.asm | 1 + src/main/resources/memory.hex | 1 + src/main/scala/RISCV/Core.scala | 2 + .../scala/RISCV/pipeline/ExecuteStage2.scala | 53 +++++++++++++++++++ 4 files changed, 57 insertions(+) create mode 100644 src/main/resources/memory.asm create mode 100644 src/main/resources/memory.hex create mode 100644 src/main/scala/RISCV/pipeline/ExecuteStage2.scala diff --git a/src/main/resources/memory.asm b/src/main/resources/memory.asm new file mode 100644 index 0000000..7957599 --- /dev/null +++ b/src/main/resources/memory.asm @@ -0,0 +1 @@ +lw x2, 0(x2) \ No newline at end of file diff --git a/src/main/resources/memory.hex b/src/main/resources/memory.hex new file mode 100644 index 0000000..ca21d81 --- /dev/null +++ b/src/main/resources/memory.hex @@ -0,0 +1 @@ +00012103 \ No newline at end of file diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index fb16383..51bd8a8 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -134,6 +134,8 @@ class Core() extends Module { printf("Jump Target: %d\n", read_stage.io.program_pointer_target); printf("=== Execute 1 ===\n"); + printf("Opcode: %b\n", execute_stage_1.io.instruction.opcode); + printf("Func3: %b\n", execute_stage_1.io.instruction.func3); printf("Out: %b\n", execute_stage_1.io.out); printf("Valid: %b\n", execute_stage_1.io.next_valid); printf("Read: %b\n", execute_stage_1.io.memory_read); diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage2.scala b/src/main/scala/RISCV/pipeline/ExecuteStage2.scala new file mode 100644 index 0000000..ef05bc4 --- /dev/null +++ b/src/main/scala/RISCV/pipeline/ExecuteStage2.scala @@ -0,0 +1,53 @@ +package RISCV + +import chisel3._ +import chisel3.util._ +import _root_.circt.stage.ChiselStage +import scala.math._ + +class ExecuteStage2() extends Module { + val io = IO(new Bundle { + val instruction = Input(new InstructionBundle()) + val rs1 = Input(UInt(32.W)) + val rs2 = Input(UInt(32.W)) + val instruction_pointer = Input(UInt(32.W)) + val valid = Input(Bool()) + + val previous_out = Input(UInt(32.W)) + val out = Output(UInt(32.W)) + val next_instruction = Output(new InstructionBundle()) + val next_valid = Output(Bool()) + + val memory_read_value = Input(UInt(32.W)) + val memory_write = Output(Bool()) + val memory_write_address = Output(UInt(32.W)) + }) + + val instruction = RegInit(0.U.asTypeOf(new InstructionBundle())) + instruction := io.instruction + io.next_instruction := instruction + + val out = RegInit(0.U(32.W)) + out := io.previous_out + io.out := out + + io.memory_write := false.B + io.memory_write_address := 0.U + + // when(io.valid) { + // switch(io.instruction.opcode) { + // // LW + // is("b0000011".U) { + // switch(io.instruction.func3) { + // is("b010".U) { + // out := io.memory_read_value + // } + // } + // } + // } + // } + + val valid = RegInit(false.B) + valid := io.valid + io.next_valid := valid +} \ No newline at end of file From 4c5dabcdd5dd75388686b09a14d91bf050ee1b46 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Tue, 2 Jun 2026 08:46:13 -0400 Subject: [PATCH 18/33] fix duplicate switch --- .../scala/RISCV/pipeline/ExecuteStage1.scala | 45 +++++++++---------- 1 file changed, 21 insertions(+), 24 deletions(-) diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala index 4468d70..eb1cbf9 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala @@ -65,8 +65,27 @@ class ExecuteStage1() extends Module { out := io.instruction_pointer + io.instruction.immediate; } - is("b010_0010011".U) { + is("b0010011".U) { switch(io.instruction.func3) { + // ADDI + is("b000".U) { + out := io.rs1 + io.instruction.immediate + } + + // SLLI + is("b001".U) { + out := io.rs1 << io.instruction.immediate(5, 0) + } + + // SRLI and SRAI + is("b101".U) { + when(io.instruction.immediate(10) === 1.U) { // SRAI + out := (io.rs1.asSInt >> io.instruction.immediate(5, 0)).asUInt + }.otherwise { // SLAI + out := io.rs1 >> io.instruction.immediate(5, 0) + } + } + // SLTI is("b010".U) { when(io.rs1.asSInt < io.instruction.immediate.asSInt) { @@ -103,7 +122,7 @@ class ExecuteStage1() extends Module { } is("b0110011".U) { - switch(io.instruction.func7) { + switch(io.instruction.func3) { // ADD is("b0000000".U) { out := io.rs1 + io.rs2 @@ -113,29 +132,7 @@ class ExecuteStage1() extends Module { is("b0110000".U) { out := io.rs1 - io.rs2 } - } - } - - is("b001_0010011".U) { - switch(io.instruction.func3) { - // SLLI - is("b001".U) { - out := io.rs1 << io.instruction.immediate(5, 0) - } - // SRLI and SRAI - is("b101".U) { - when(io.instruction.immediate(10) === 1.U) { // SRAI - out := (io.rs1.asSInt >> io.instruction.immediate(5, 0)).asUInt - }.otherwise { // SLAI - out := io.rs1 >> io.instruction.immediate(5, 0) - } - } - } - } - - is("b001_0110011".U) { - switch(io.instruction.func3) { // SLL is("b001".U) { out := io.rs1 << io.rs2(5, 0) From 4b07e9b08e0479c165feeb15ef6b0292ef9c8c83 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Tue, 2 Jun 2026 08:47:03 -0400 Subject: [PATCH 19/33] remove debug log --- src/main/scala/RISCV/Core.scala | 2 -- 1 file changed, 2 deletions(-) diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index 51bd8a8..fb16383 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -134,8 +134,6 @@ class Core() extends Module { printf("Jump Target: %d\n", read_stage.io.program_pointer_target); printf("=== Execute 1 ===\n"); - printf("Opcode: %b\n", execute_stage_1.io.instruction.opcode); - printf("Func3: %b\n", execute_stage_1.io.instruction.func3); printf("Out: %b\n", execute_stage_1.io.out); printf("Valid: %b\n", execute_stage_1.io.next_valid); printf("Read: %b\n", execute_stage_1.io.memory_read); From 95969ee3a3214b018693b4e7d65595c7786b28ce Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Tue, 2 Jun 2026 08:55:32 -0400 Subject: [PATCH 20/33] working load word --- src/main/scala/RISCV/Core.scala | 2 + .../scala/RISCV/pipeline/ExecuteStage1.scala | 2 +- .../scala/RISCV/pipeline/ExecuteStage2.scala | 24 ++++----- src/test/scala/RISCV/CoreSpec.scala | 54 +++++++++---------- 4 files changed, 42 insertions(+), 40 deletions(-) diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index fb16383..5eb018b 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -134,6 +134,8 @@ class Core() extends Module { printf("Jump Target: %d\n", read_stage.io.program_pointer_target); printf("=== Execute 1 ===\n"); + // printf("Opcode: %b\n", execute_stage_1.io.instruction.opcode); + // printf("Func3: %b\n", execute_stage_1.io.instruction.func3); printf("Out: %b\n", execute_stage_1.io.out); printf("Valid: %b\n", execute_stage_1.io.next_valid); printf("Read: %b\n", execute_stage_1.io.memory_read); diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala index eb1cbf9..63a524b 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala @@ -249,7 +249,7 @@ class ExecuteStage1() extends Module { } } } - is("b010_0000011".U) { + is("b0000011".U) { switch(io.instruction.func3) { // LW is("b010".U) { diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage2.scala b/src/main/scala/RISCV/pipeline/ExecuteStage2.scala index ef05bc4..47dc12f 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage2.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage2.scala @@ -34,18 +34,18 @@ class ExecuteStage2() extends Module { io.memory_write := false.B io.memory_write_address := 0.U - // when(io.valid) { - // switch(io.instruction.opcode) { - // // LW - // is("b0000011".U) { - // switch(io.instruction.func3) { - // is("b010".U) { - // out := io.memory_read_value - // } - // } - // } - // } - // } + when(io.valid) { + switch(io.instruction.opcode) { + // LW + is("b0000011".U) { + switch(io.instruction.func3) { + is("b010".U) { + out := io.memory_read_value + } + } + } + } + } val valid = RegInit(false.B) valid := io.valid diff --git a/src/test/scala/RISCV/CoreSpec.scala b/src/test/scala/RISCV/CoreSpec.scala index ce7bed5..f285e5e 100644 --- a/src/test/scala/RISCV/CoreSpec.scala +++ b/src/test/scala/RISCV/CoreSpec.scala @@ -11,33 +11,9 @@ import chisel3.simulator.PeekPokeAPI.TestableRecord import scala.io.Source class CoreSpec extends AnyFreeSpec with Matchers with ChiselSim { - "Core should execute program.hex correctly" in { - simulate(new Core()) { dut => - val path = getClass.getResource("/program.hex").getPath - val lines = Source.fromFile(path).getLines().toList - - dut.io.flash.poke(true.B) - - lines.zipWithIndex.foreach { case (line, index) => - val value = java.lang.Long.parseLong(line.trim, 16) - - dut.io.flash_address.poke((index * 4).U) - dut.io.flash_value.poke(value.U) - - dut.clock.step(1) - } - - dut.io.flash.poke(false.B) - - dut.io.execute.poke(true.B) - - dut.clock.step(16) - } - } - - // "Core should execute memory.hex correctly" in { + // "Core should execute program.hex correctly" in { // simulate(new Core()) { dut => - // val path = getClass.getResource("/memory.hex").getPath + // val path = getClass.getResource("/program.hex").getPath // val lines = Source.fromFile(path).getLines().toList // dut.io.flash.poke(true.B) @@ -55,7 +31,31 @@ class CoreSpec extends AnyFreeSpec with Matchers with ChiselSim { // dut.io.execute.poke(true.B) - // dut.clock.step(8) + // dut.clock.step(16) // } // } + + "Core should execute memory.hex correctly" in { + simulate(new Core()) { dut => + val path = getClass.getResource("/memory.hex").getPath + val lines = Source.fromFile(path).getLines().toList + + dut.io.flash.poke(true.B) + + lines.zipWithIndex.foreach { case (line, index) => + val value = java.lang.Long.parseLong(line.trim, 16) + + dut.io.flash_address.poke((index * 4).U) + dut.io.flash_value.poke(value.U) + + dut.clock.step(1) + } + + dut.io.flash.poke(false.B) + + dut.io.execute.poke(true.B) + + dut.clock.step(8) + } + } } From f9eac8b28fb38c4740d5b3abd1f200340f744a2e Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Tue, 2 Jun 2026 10:23:12 -0400 Subject: [PATCH 21/33] working load and store word --- src/main/resources/memory.asm | 2 + src/main/resources/memory.hex | 2 + src/main/scala/RISCV/Core.scala | 44 +++++++++++++----- .../scala/RISCV/pipeline/ExecuteStage1.scala | 45 ++++++++++++++++--- .../scala/RISCV/pipeline/ExecuteStage2.scala | 15 ++++++- src/test/scala/RISCV/CoreSpec.scala | 2 +- 6 files changed, 90 insertions(+), 20 deletions(-) diff --git a/src/main/resources/memory.asm b/src/main/resources/memory.asm index 7957599..f6fc519 100644 --- a/src/main/resources/memory.asm +++ b/src/main/resources/memory.asm @@ -1 +1,3 @@ +addi x1, x0, 123 +sw x1, 0(x2) lw x2, 0(x2) \ No newline at end of file diff --git a/src/main/resources/memory.hex b/src/main/resources/memory.hex index ca21d81..714799f 100644 --- a/src/main/resources/memory.hex +++ b/src/main/resources/memory.hex @@ -1 +1,3 @@ +07b00093 +00112023 00012103 \ No newline at end of file diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index 5eb018b..c914409 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -28,10 +28,6 @@ class Core() extends Module { memory.io.write_1 := false.B memory.io.write_value_1 := 0.U - memory.io.read_2 := true.B - memory.io.write_2 := 0.U - memory.io.write_value_2 := 0.U - memory.io.btns := 0.U // ==== FETCH ==== @@ -71,12 +67,13 @@ class Core() extends Module { execute_stage_1.io.instruction_pointer := read_stage.io.next_instruction_pointer execute_stage_1.io.valid := read_stage.io.next_valid - fetch_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush || read_stage.io.raw_hazard_flush - decode_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush || read_stage.io.raw_hazard_flush - read_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush || read_stage.io.raw_hazard_flush + fetch_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush || read_stage.io.raw_hazard_flush || execute_stage_1.io.memory_use_flush + decode_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush || read_stage.io.raw_hazard_flush || execute_stage_1.io.memory_use_flush + read_stage.io.flush := execute_stage_1.io.program_pointer_jump_flush || read_stage.io.raw_hazard_flush || execute_stage_1.io.memory_use_flush + execute_stage_1.io.flush := execute_stage_1.io.memory_use_flush when(io.execute) { - when(execute_stage_1.io.program_pointer_jump_flush) { + when(execute_stage_1.io.program_pointer_jump_flush || execute_stage_1.io.memory_use_flush) { program_pointer := execute_stage_1.io.program_pointer_target }.otherwise { when(read_stage.io.raw_hazard_flush) { @@ -87,8 +84,6 @@ class Core() extends Module { } } - memory.io.address_2 := execute_stage_1.io.memory_read_address - // ==== EXECUTE 2 ==== val execute_stage_2 = Module(new ExecuteStage2()) @@ -101,6 +96,25 @@ class Core() extends Module { execute_stage_2.io.memory_read_value := memory.io.read_value_2 + when(execute_stage_2.io.memory_write) { + memory.io.read_2 := false.B + memory.io.write_2 := true.B + memory.io.address_2 := execute_stage_2.io.memory_write_address + memory.io.write_value_2 := execute_stage_2.io.memory_write_value + }.otherwise { + when(execute_stage_1.io.memory_read) { + memory.io.read_2 := true.B + memory.io.write_2 := false.B + memory.io.address_2 := execute_stage_1.io.memory_read_address + memory.io.write_value_2 := 0.U + }.otherwise { + memory.io.read_2 := false.B + memory.io.write_2 := false.B + memory.io.address_2 := 0.U + memory.io.write_value_2 := 0.U + } + } + // ==== WRITE ==== val write_stage = Module(new WriteStage()) @@ -134,17 +148,23 @@ class Core() extends Module { printf("Jump Target: %d\n", read_stage.io.program_pointer_target); printf("=== Execute 1 ===\n"); - // printf("Opcode: %b\n", execute_stage_1.io.instruction.opcode); - // printf("Func3: %b\n", execute_stage_1.io.instruction.func3); + printf("Opcode: %b\n", execute_stage_1.io.instruction.opcode); + printf("Func3: %b\n", execute_stage_1.io.instruction.func3); printf("Out: %b\n", execute_stage_1.io.out); printf("Valid: %b\n", execute_stage_1.io.next_valid); printf("Read: %b\n", execute_stage_1.io.memory_read); printf("Read Adress: %b\n", execute_stage_1.io.memory_read_address); printf("Jump Flush Requested: %b\n", execute_stage_1.io.program_pointer_jump_flush); + printf("Memory Flush Requested: %b\n", execute_stage_1.io.memory_use_flush); printf("Jump Target: %d\n", execute_stage_1.io.program_pointer_target); printf("=== Execute 2 ===\n"); + printf("Opcode: %b\n", execute_stage_2.io.instruction.opcode); + printf("Func3: %b\n", execute_stage_2.io.instruction.func3); printf("Read Value: %b\n", memory.io.read_value_2); + printf("Write: %b\n", execute_stage_2.io.memory_write); + printf("Write Adress: %b\n", execute_stage_2.io.memory_write_address); + printf("Write Value: %b\n", execute_stage_2.io.memory_write_value); printf("Out: %b\n", execute_stage_2.io.out); printf("Valid: %b\n", execute_stage_2.io.next_valid); diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala index 63a524b..1b023d6 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala @@ -20,7 +20,10 @@ class ExecuteStage1() extends Module { val out = Output(UInt(32.W)) val next_valid = Output(Bool()) + val flush = Input(Bool()) + val program_pointer_jump_flush = Output(Bool()) + val memory_use_flush = Output(Bool()) val program_pointer_target = Output(UInt(32.W)) val memory_read = Output(Bool()) @@ -53,6 +56,11 @@ class ExecuteStage1() extends Module { io.memory_read := false.B io.memory_read_address := 0.U + val interacting_with_memory = RegInit(false.B) + interacting_with_memory := false.B + + io.memory_use_flush := false.B + when(io.valid) { switch(io.instruction.opcode) { // LUI @@ -249,12 +257,37 @@ class ExecuteStage1() extends Module { } } } + is("b0000011".U) { - switch(io.instruction.func3) { - // LW - is("b010".U) { - io.memory_read := true.B - io.memory_read_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + when(interacting_with_memory) { + io.memory_use_flush := true.B + io.program_pointer_target := io.instruction_pointer + }.otherwise { + switch(io.instruction.func3) { + // LW + is("b010".U) { + io.memory_read := true.B + io.memory_read_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + + interacting_with_memory := true.B + } + } + } + } + + is("b0100011".U) { + when(interacting_with_memory) { + io.memory_use_flush := true.B + io.program_pointer_target := io.instruction_pointer + }.otherwise { + switch(io.instruction.func3) { + // SW + is("b010".U) { + io.memory_read := true.B + io.memory_read_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + + interacting_with_memory := true.B + } } } } @@ -262,6 +295,6 @@ class ExecuteStage1() extends Module { } val valid = RegInit(false.B) - valid := io.valid + valid := io.valid && !io.flush io.next_valid := valid } \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage2.scala b/src/main/scala/RISCV/pipeline/ExecuteStage2.scala index 47dc12f..28b0f87 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage2.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage2.scala @@ -21,6 +21,7 @@ class ExecuteStage2() extends Module { val memory_read_value = Input(UInt(32.W)) val memory_write = Output(Bool()) val memory_write_address = Output(UInt(32.W)) + val memory_write_value = Output(UInt(32.W)) }) val instruction = RegInit(0.U.asTypeOf(new InstructionBundle())) @@ -33,17 +34,29 @@ class ExecuteStage2() extends Module { io.memory_write := false.B io.memory_write_address := 0.U + io.memory_write_value := 0.U when(io.valid) { switch(io.instruction.opcode) { - // LW is("b0000011".U) { switch(io.instruction.func3) { + // LW is("b010".U) { out := io.memory_read_value } } } + + is("b0100011".U) { + switch(io.instruction.func3) { + // SW + is("b010".U) { + io.memory_write := true.B + io.memory_write_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + io.memory_write_value := io.rs2 + } + } + } } } diff --git a/src/test/scala/RISCV/CoreSpec.scala b/src/test/scala/RISCV/CoreSpec.scala index f285e5e..04c9f52 100644 --- a/src/test/scala/RISCV/CoreSpec.scala +++ b/src/test/scala/RISCV/CoreSpec.scala @@ -55,7 +55,7 @@ class CoreSpec extends AnyFreeSpec with Matchers with ChiselSim { dut.io.execute.poke(true.B) - dut.clock.step(8) + dut.clock.step(16) } } } From 17164deaa77dd21f86e0bfa60def77874c880203 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Wed, 3 Jun 2026 08:48:58 -0400 Subject: [PATCH 22/33] implement other load and store instructions --- src/main/scala/RISCV/Core.scala | 12 ++++ .../scala/RISCV/pipeline/ExecuteStage1.scala | 30 +++++++- .../scala/RISCV/pipeline/ExecuteStage2.scala | 68 +++++++++++++++++++ 3 files changed, 108 insertions(+), 2 deletions(-) diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index c914409..3ffb6b5 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -183,4 +183,16 @@ class Core() extends Module { memory.io.write_value_1 := io.flash_value } } +} + +object Core extends App { + ChiselStage.emitSystemVerilogFile( + new Core(), + firtoolOpts = Array( + "-disable-all-randomization", + "-strip-debug-info", + "-default-layer-specialization=enable" + ), + args = Array("--target-dir", "generated") + ) } \ No newline at end of file diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala index 1b023d6..de20411 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage1.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage1.scala @@ -264,12 +264,22 @@ class ExecuteStage1() extends Module { io.program_pointer_target := io.instruction_pointer }.otherwise { switch(io.instruction.func3) { + // LB + is("b000".U) { + io.memory_read := true.B + io.memory_read_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + } + + // LH + is("b001".U) { + io.memory_read := true.B + io.memory_read_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + } + // LW is("b010".U) { io.memory_read := true.B io.memory_read_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U - - interacting_with_memory := true.B } } } @@ -281,6 +291,22 @@ class ExecuteStage1() extends Module { io.program_pointer_target := io.instruction_pointer }.otherwise { switch(io.instruction.func3) { + // SB + is("b000".U) { + io.memory_read := true.B + io.memory_read_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + + interacting_with_memory := true.B + } + + // SH + is("b001".U) { + io.memory_read := true.B + io.memory_read_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + + interacting_with_memory := true.B + } + // SW is("b010".U) { io.memory_read := true.B diff --git a/src/main/scala/RISCV/pipeline/ExecuteStage2.scala b/src/main/scala/RISCV/pipeline/ExecuteStage2.scala index 28b0f87..d5d2e40 100644 --- a/src/main/scala/RISCV/pipeline/ExecuteStage2.scala +++ b/src/main/scala/RISCV/pipeline/ExecuteStage2.scala @@ -40,6 +40,38 @@ class ExecuteStage2() extends Module { switch(io.instruction.opcode) { is("b0000011".U) { switch(io.instruction.func3) { + // LB + is("b000".U) { + val offset = (io.rs1.zext + io.instruction.immediate.asSInt).asUInt % 4.U + + switch(offset) { + is(0.U) { + out := io.memory_read_value & 0xFF.U + } + + is(1.U) { + out := io.memory_read_value >> 8.U & 0xFF.U + } + + is(2.U) { + out := io.memory_read_value >> 16.U & 0xFF.U + } + + is(3.U) { + out := io.memory_read_value >> 24.U & 0xFF.U + } + } + } + + // LH + is("b001".U) { + when((io.rs1.zext + io.instruction.immediate.asSInt).asUInt % 4.U === 0.U) { + out := io.memory_read_value & 0xFFFF.U + }.otherwise { + out := io.memory_read_value >> 16.U + } + } + // LW is("b010".U) { out := io.memory_read_value @@ -49,6 +81,42 @@ class ExecuteStage2() extends Module { is("b0100011".U) { switch(io.instruction.func3) { + // SB + is("b000".U) { + io.memory_write := true.B + io.memory_write_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + + switch((io.rs1.zext + io.instruction.immediate.asSInt).asUInt % 4.U) { + is(0.U) { + io.memory_write_value := io.memory_read_value(31, 8) ## io.rs2(7, 0) + } + + is(1.U) { + io.memory_write_value := io.memory_read_value(31, 16) ## io.rs2(15, 8) ## io.memory_read_value(7, 0) + } + + is(2.U) { + io.memory_write_value := io.memory_read_value(31, 24) ## io.rs2(23, 16) ## io.memory_read_value(15, 0) + } + + is(3.U) { + io.memory_write_value := io.rs2(31, 24) ## io.memory_read_value(23, 0) + } + } + } + + // SH + is("b001".U) { + io.memory_write := true.B + io.memory_write_address := (io.rs1.zext + io.instruction.immediate.asSInt).asUInt / 4.U + + when((io.rs1.zext + io.instruction.immediate.asSInt).asUInt % 4.U === 0.U) { + io.memory_write_value := io.memory_read_value(31, 16) ## io.rs2(15, 0) + }.otherwise { + io.memory_write_value := io.rs2(31, 16) ## io.memory_read_value(15, 0) + } + } + // SW is("b010".U) { io.memory_write := true.B From c33fd4cb5efbf2b027f2101be1ab52fb142ec45f Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Wed, 3 Jun 2026 08:56:45 -0400 Subject: [PATCH 23/33] register debug --- src/main/scala/RISCV/Core.scala | 15 +- src/main/scala/RISCV/Main.scala | 389 --------------------------- src/main/scala/RISCV/Registers.scala | 11 +- 3 files changed, 18 insertions(+), 397 deletions(-) delete mode 100644 src/main/scala/RISCV/Main.scala diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index 3ffb6b5..b13adca 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -18,10 +18,9 @@ class Core() extends Module { val registers = Module(new Registers()) registers.io.write_enable := false.B registers.io.write_address := 0.U(5.W) + registers.io.in := 0.U(32.W) registers.io.read_address_a := 0.U(5.W) registers.io.read_address_b := 0.U(5.W) - registers.io.read_address_c := 0.U(5.W) - registers.io.in := 0.U(32.W) val memory = Module(new Memory()) memory.io.read_1 := true.B @@ -173,6 +172,18 @@ class Core() extends Module { printf("Address: %b\n", write_stage.io.register_address); printf("Value: %b\n", write_stage.io.register_value); printf("Valid: %b\n", write_stage.io.next_valid); + + printf("=== Dump ===\n"); + printf("01: %b\n", registers.io.debug_1); + printf("02: %b\n", registers.io.debug_2); + printf("03: %b\n", registers.io.debug_3); + printf("04: %b\n", registers.io.debug_4); + printf("05: %b\n", registers.io.debug_5); + printf("06: %b\n", registers.io.debug_6); + printf("07: %b\n", registers.io.debug_7); + printf("08: %b\n", registers.io.debug_8); + printf("09: %b\n", registers.io.debug_9); + printf("10: %b\n", registers.io.debug_10); }.otherwise { printf("Loading...\n"); diff --git a/src/main/scala/RISCV/Main.scala b/src/main/scala/RISCV/Main.scala deleted file mode 100644 index 3e2ae24..0000000 --- a/src/main/scala/RISCV/Main.scala +++ /dev/null @@ -1,389 +0,0 @@ -package RISCV - -import chisel3._ -import chisel3.util._ -import _root_.circt.stage.ChiselStage -import scala.math._ -import os.read - - - -class Main() extends Module { - val io = IO(new Bundle { - val execute = Input(Bool()); - - val vga_clk = Input(Clock()); - val debug_write = Input(Bool()); - val debug_write_address = Input(UInt(32.W)); - val debug_write_data = Input(UInt(32.W)); - - val hsync = Output(Bool()) - val vsync = Output(Bool()) - val rgb = Output(UInt(12.W)) - val blanking = Output(Bool()) - - val btns = Input(UInt(4.W)) - - val debug_1 = Output(UInt(32.W)) - val debug_2 = Output(UInt(32.W)) - }) - - - - val program_pointer = RegInit(0.U(32.W)) - - val registers = Module(new Registers()) - registers.io.write_enable := false.B - registers.io.write_address := 0.U(5.W) - registers.io.read_address_a := 0.U(5.W) - registers.io.read_address_b := 0.U(5.W) - registers.io.read_address_c := 0.U(5.W) - registers.io.in := 0.U(32.W) - - - - val memory = Module(new Memory()) - memory.io.btns := io.btns - - val vga_controller = Module(new VGAController()) - vga_controller.io.address := memory.io.address_vga - vga_controller.io.write := memory.io.write_vga - vga_controller.io.write_value := memory.io.write_value_vga - vga_controller.io.read_clk := io.vga_clk - io.hsync := vga_controller.io.hsync - io.vsync := vga_controller.io.vsync - io.rgb := vga_controller.io.rgb - io.blanking := vga_controller.io.blanking - - val decoder = Module(new Decoder()) - decoder.io.instruction := 0.U; - - // 0 - Load Instruction 1 - Execute Instruction A 2 - Execute Instruction B - val stage = RegInit(0.U(3.W)); - - - - memory.io.write_1 := false.B - memory.io.read_1 := false.B - memory.io.address_1 := 0.U - memory.io.write_value_1 := 0.U - - memory.io.write_2 := false.B - memory.io.read_2 := false.B - memory.io.address_2 := 0.U - memory.io.write_value_2 := 0.U - - - - when(io.debug_write) { - memory.io.write_1 := true.B - memory.io.address_1 := io.debug_write_address - memory.io.write_value_1 := io.debug_write_data - } - - val immediate_buffer = RegInit(0.U(32.W)); - val rs1_buffer = RegInit(0.U(5.W)); - val rs2_buffer = RegInit(0.U(5.W)); - val rd_buffer = RegInit(0.U(5.W)); - val opcode_buffer = RegInit(0.U(7.W)); - val funct3_buffer = RegInit(0.U(3.W)); - val funct7_buffer = RegInit(0.U(7.W)); - val out_a_buffer = RegInit(0.U(32.W)); - val out_b_buffer = RegInit(0.U(32.W)); - - io.debug_1 := program_pointer - io.debug_2 := stage ## opcode_buffer - - val alu = Module(new ALU()) - alu.io.func7 := funct7_buffer; - alu.io.func3 := funct3_buffer; - alu.io.a := out_a_buffer; - alu.io.b := 0.U(32.W) - alu.io.isM := false.B - when(io.execute) { - printf("\n"); - printf("Stage: %d\n", stage); - - when(stage =/= 0.U) { - printf("Program Pointer: %d\n", program_pointer); - printf("Data 1: %b\n", memory.io.read_value_1); - printf("Data 2: %b\n", memory.io.read_value_2); - printf("Register 1: %b\n", registers.io.debug_1); - printf("Register 2: %b\n", registers.io.debug_2); - printf("Register 3: %b\n", registers.io.debug_3); - printf("Register 4: %b\n", registers.io.debug_4); - printf("Register 5: %b\n", registers.io.debug_5); - printf("Register 6: %b\n", registers.io.debug_6); - printf("Register 7: %b\n", registers.io.debug_7); - printf("Register 8: %b\n", registers.io.debug_8); - printf("Register 9: %b\n", registers.io.debug_9); - printf("Register10: %b\n", registers.io.debug_10); - } - - stage := stage + 1.U; - - when(stage === 0.U){ - memory.io.read_1 := true.B - memory.io.address_1 := program_pointer / 4.U - } - - when(stage === 1.U) { - decoder.io.instruction := memory.io.read_value_1 - - immediate_buffer := decoder.io.immediate - rs1_buffer := decoder.io.rs1 - rs2_buffer := decoder.io.rs2 - rd_buffer := decoder.io.rd - opcode_buffer := decoder.io.opcode - funct3_buffer := decoder.io.func3 - funct7_buffer := decoder.io.func7 - registers.io.read_address_a := decoder.io.rs1 - registers.io.read_address_b := decoder.io.rs2 - out_a_buffer := registers.io.out_a - out_b_buffer := registers.io.out_b - - - } - - when(stage === 2.U) { - - - - val pc_plus_4 = program_pointer + 4.U - val pc_plus_imm = program_pointer + immediate_buffer - val addr = out_a_buffer + immediate_buffer - - switch(opcode_buffer){ - //Load - is("b0000011".U) { - - program_pointer := pc_plus_4; - memory.io.read_1 := true.B - memory.io.address_1 := (addr) / 4.U; - memory.io.read_2 := true.B - memory.io.address_2 := (addr) / 4.U + 1.U; - - } - //Store - is("b0100011".U){ - - program_pointer := pc_plus_4; - memory.io.read_1 := true.B - memory.io.address_1 := (addr) / 4.U; - memory.io.read_2 := true.B - memory.io.address_2 := (addr) / 4.U + 1.U; - - } - //ALU Imm,Reg - is("b0010011".U, "b0110011".U){ - - registers.io.write_address := rd_buffer - registers.io.write_enable := true.B - program_pointer := pc_plus_4 - stage := 0.U - val neg = Mux(opcode_buffer === "b0110011".U && funct7_buffer(5), - out_b_buffer, out_b_buffer) - val alu_b = Mux(opcode_buffer === "b0010011".U, immediate_buffer, neg) - alu.io.b := alu_b - alu.io.isM := opcode_buffer === "b0110011".U && funct7_buffer === "b0000001".U - registers.io.in := alu.io.output - - } - //Branch - is("b1100011".U){ - stage := 0.U; - val eq = out_a_buffer === out_b_buffer - val lt_signed = out_a_buffer.asSInt < out_b_buffer.asSInt - val lt_unsigned = out_a_buffer < out_b_buffer - val lt_sel = Mux(funct3_buffer(1), lt_unsigned,lt_signed) - val lt_eq_sel = Mux(funct3_buffer(2),lt_sel,eq) - val take_branch = lt_eq_sel ^ funct3_buffer(0) - program_pointer := Mux(take_branch, pc_plus_imm, pc_plus_4) - } - //LUI - is("b0110111".U){ - registers.io.write_address := rd_buffer; - registers.io.write_enable := true.B; - registers.io.in := immediate_buffer; - - program_pointer := pc_plus_4; - stage := 0.U; - - // printf( - // "[LUI] Rd: %d Immediate: %b\n", - // decoder.io.rd, - // decoder.io.immediate - // ); - } - //AUIPC - is("b0010111".U){ - registers.io.write_address := rd_buffer; - registers.io.write_enable := true.B; - registers.io.in := pc_plus_imm; - - program_pointer := pc_plus_4; - stage := 0.U; - - // printf( - // "[AUIPC] Rd: %d Immediate: %b\n", - // decoder.io.rd, - // decoder.io.immediate - // ); - } - //JAL - is("b1101111".U){ - registers.io.write_address := rd_buffer; - registers.io.write_enable := true.B; - registers.io.in := pc_plus_4 - - program_pointer := pc_plus_imm; - stage := 0.U; - - // printf( - // "[JAL] Rd: %d Immediate: %b\n", - // decoder.io.rd, - // decoder.io.immediate - // ); - } - //JALR - is("b1100111".U){ - registers.io.read_address_a := rs1_buffer; - - registers.io.write_address := rd_buffer; - registers.io.write_enable := true.B; - registers.io.in :=pc_plus_4; - - program_pointer := addr & ~1.U(32.W) - stage := 0.U; - - // printf( - // "[JALR] RS1: %d Rd: %d Immediate: %b\n", - // decoder.io.rs1, - // decoder.io.rd, - // decoder.io.immediate - // ); - - } - //FENCE - is("b0001111".U){ - program_pointer := pc_plus_4; - stage := 0.U; - printf("[FENCE]"); - - } - - } - - - } - - when(stage === 3.U) { - stage := 0.U - val addr = out_a_buffer + immediate_buffer - val byte_offset = addr(1, 0) - val shift_amount = byte_offset ## 0.U(3.W) - - switch(opcode_buffer){ - //Loads - is("b0000011".U){ - - registers.io.read_address_a := rs1_buffer - registers.io.write_address := rd_buffer - registers.io.write_enable := true.B - - val raw_data = (memory.io.read_value_1 >> shift_amount | memory.io.read_value_2 << (32.U - shift_amount)) - - switch(funct3_buffer){ - //LB - is("b000".U){ - registers.io.in := Fill(24, raw_data(7)) ## raw_data(7, 0) - } - //LH - is("b001".U){ - registers.io.in := Fill(16, raw_data(15)) ## raw_data(15, 0) - } - //LW - is("b010".U){ - registers.io.in := raw_data - } - //LBU - is("b100".U){ - registers.io.in := 0.U(24.W) ## raw_data(7, 0) - } - //LHU - is("b101".U){ - registers.io.in := 0.U(16.W) ## raw_data(15, 0) - } - } - } - is("b0100011".U){ - registers.io.read_address_a := rs1_buffer - registers.io.read_address_b := rs2_buffer - - memory.io.write_1 := true.B - memory.io.address_1 := addr / 4.U - memory.io.write_2 := true.B - memory.io.address_2 := addr / 4.U + 1.U - - val value_1 = WireDefault(memory.io.read_value_1) - val value_2 = WireDefault(memory.io.read_value_2) - - switch(funct3_buffer){ - is("b000".U) { // SB - switch(byte_offset) { - is(0.U) { value_1 := Cat(memory.io.read_value_1(31, 8), out_b_buffer(7, 0)) } - is(1.U) { value_1 := Cat(memory.io.read_value_1(31, 16), out_b_buffer(7, 0), memory.io.read_value_1(7, 0)) } - is(2.U) { value_1 := Cat(memory.io.read_value_1(31, 24), out_b_buffer(7, 0), memory.io.read_value_1(15, 0)) } - is(3.U) { value_1 := Cat(out_b_buffer(7, 0), memory.io.read_value_1(23, 0)) } - } - } - is("b001".U){ //SH - switch(byte_offset) { - is(0.U) { value_1 := Cat(memory.io.read_value_1(31, 16), out_b_buffer(15, 0)) } - is(1.U) { value_1 := Cat(memory.io.read_value_1(31, 24), out_b_buffer(15, 0), memory.io.read_value_1(7, 0)) } - is(2.U) { value_1 := Cat(out_b_buffer(15, 0), memory.io.read_value_1(15, 0)) } - is(3.U) { - value_1 := Cat(out_b_buffer(7, 0), memory.io.read_value_1(23, 0)) - value_2 := Cat(memory.io.read_value_2(31, 8), out_b_buffer(15, 8)) - } - } - } - is("b010".U) { // SW - switch(byte_offset) { - is(0.U) { value_1 := out_b_buffer } - is(1.U) { - value_1 := Cat(out_b_buffer(23, 0), memory.io.read_value_1(7, 0)) - value_2 := Cat(memory.io.read_value_2(31, 8), out_b_buffer(31, 24)) - } - is(2.U) { - value_1 := Cat(out_b_buffer(15, 0), memory.io.read_value_1(15, 0)) - value_2 := Cat(memory.io.read_value_2(31, 16), out_b_buffer(31, 16)) - } - is(3.U) { - value_1 := Cat(out_b_buffer(7, 0), memory.io.read_value_1(23, 0)) - value_2 := Cat(memory.io.read_value_2(31, 24), out_b_buffer(31, 8)) - } - } - } - } - memory.io.write_value_1 := value_1 - memory.io.write_value_2 := value_2 - - } - } - - - } - } -} - -object Main extends App { - ChiselStage.emitSystemVerilogFile( - new Main(), - firtoolOpts = Array( - "-disable-all-randomization", - "-strip-debug-info", - "-default-layer-specialization=enable" - ), - args = Array("--target-dir", "generated") - ) -} diff --git a/src/main/scala/RISCV/Registers.scala b/src/main/scala/RISCV/Registers.scala index 84774b4..8bf755a 100644 --- a/src/main/scala/RISCV/Registers.scala +++ b/src/main/scala/RISCV/Registers.scala @@ -25,15 +25,15 @@ import _root_.circt.stage.ChiselStage class Registers() extends Module { val io = IO(new Bundle { - val in = Input(UInt(32.W)) + val write_enable = Input(Bool()) val write_address = Input(UInt(5.W)) + val in = Input(UInt(32.W)) + val read_address_a = Input(UInt(5.W)) val read_address_b = Input(UInt(5.W)) - val read_address_c = Input(UInt(5.W)) // Testing address port - val write_enable = Input(Bool()) - val out_a = Output(UInt(32.W)) + + val out_a = Output(UInt(32.W)) val out_b = Output(UInt(32.W)) - val out_c = Output(UInt(32.W)) // Testing output port val debug_1 = Output(UInt(32.W)); val debug_2 = Output(UInt(32.W)); @@ -52,7 +52,6 @@ class Registers() extends Module { // Dual read ports io.out_a := regs(io.read_address_a) io.out_b := regs(io.read_address_b) - io.out_c := regs(io.read_address_c) io.debug_1 := regs(1); io.debug_2 := regs(2); From 7d406dbd135ae8a1191347cc39bcecc8a551110d Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Mon, 8 Jun 2026 19:26:25 -0400 Subject: [PATCH 24/33] start main integration with core --- .vscode/settings.json | 4 +- .../RISCV => disabled-tests}/CoreSpec.scala | 0 .../DecodeStageSpec.scala | 0 .../FetchStageSpec.scala | 0 src/main/scala/RISCV/Core.scala | 59 ++++++++---------- src/main/scala/RISCV/Main.scala | 57 +++++++++++++++++ src/test/scala/RISCV/MainSpec.scala | 61 +++++++++++++++++++ 7 files changed, 144 insertions(+), 37 deletions(-) rename {src/test/scala/RISCV => disabled-tests}/CoreSpec.scala (100%) rename {src/test/scala/RISCV => disabled-tests}/DecodeStageSpec.scala (100%) rename {src/test/scala/RISCV => disabled-tests}/FetchStageSpec.scala (100%) create mode 100644 src/main/scala/RISCV/Main.scala create mode 100644 src/test/scala/RISCV/MainSpec.scala diff --git a/.vscode/settings.json b/.vscode/settings.json index dd42a44..32cfc61 100644 --- a/.vscode/settings.json +++ b/.vscode/settings.json @@ -1,5 +1,5 @@ { "files.watcherExclude": { - "**/target": true - } + "**/target": true + } } \ No newline at end of file diff --git a/src/test/scala/RISCV/CoreSpec.scala b/disabled-tests/CoreSpec.scala similarity index 100% rename from src/test/scala/RISCV/CoreSpec.scala rename to disabled-tests/CoreSpec.scala diff --git a/src/test/scala/RISCV/DecodeStageSpec.scala b/disabled-tests/DecodeStageSpec.scala similarity index 100% rename from src/test/scala/RISCV/DecodeStageSpec.scala rename to disabled-tests/DecodeStageSpec.scala diff --git a/src/test/scala/RISCV/FetchStageSpec.scala b/disabled-tests/FetchStageSpec.scala similarity index 100% rename from src/test/scala/RISCV/FetchStageSpec.scala rename to disabled-tests/FetchStageSpec.scala diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index b13adca..1ed20b0 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -8,9 +8,14 @@ class Core() extends Module { val io = IO(new Bundle { val execute = Input(Bool()) - val flash = Input(Bool()) - val flash_address = Input(UInt(32.W)) - val flash_value = Input(UInt(32.W)) + val program_memory_adress = Output(UInt(32.W)) + val program_memory_value = Input(UInt(32.W)) + + val memory_address = Output(UInt(32.W)) + val memory_read = Output(Bool()) + val memory_read_value = Input(UInt(32.W)) + val memory_write = Output(Bool()) + val memory_write_value = Output(UInt(32.W)) }) val program_pointer = RegInit(0.U(32.W)) @@ -22,21 +27,14 @@ class Core() extends Module { registers.io.read_address_a := 0.U(5.W) registers.io.read_address_b := 0.U(5.W) - val memory = Module(new Memory()) - memory.io.read_1 := true.B - memory.io.write_1 := false.B - memory.io.write_value_1 := 0.U - - memory.io.btns := 0.U - // ==== FETCH ==== val fetch_stage = Module(new FetchStage()) fetch_stage.io.execute := io.execute fetch_stage.io.program_pointer := program_pointer - fetch_stage.io.memory_read_value := memory.io.read_value_1 + fetch_stage.io.memory_read_value := io.program_memory_value - memory.io.address_1 := fetch_stage.io.memory_read_address + io.program_memory_adress := fetch_stage.io.memory_read_address // ==== DECODE ==== @@ -93,24 +91,24 @@ class Core() extends Module { execute_stage_2.io.valid := execute_stage_1.io.next_valid execute_stage_2.io.previous_out := execute_stage_1.io.out - execute_stage_2.io.memory_read_value := memory.io.read_value_2 + execute_stage_2.io.memory_read_value := io.memory_read_value when(execute_stage_2.io.memory_write) { - memory.io.read_2 := false.B - memory.io.write_2 := true.B - memory.io.address_2 := execute_stage_2.io.memory_write_address - memory.io.write_value_2 := execute_stage_2.io.memory_write_value + io.memory_read := false.B + io.memory_write := true.B + io.memory_address := execute_stage_2.io.memory_write_address + io.memory_write_value := execute_stage_2.io.memory_write_value }.otherwise { when(execute_stage_1.io.memory_read) { - memory.io.read_2 := true.B - memory.io.write_2 := false.B - memory.io.address_2 := execute_stage_1.io.memory_read_address - memory.io.write_value_2 := 0.U + io.memory_read := true.B + io.memory_write := false.B + io.memory_address := execute_stage_1.io.memory_read_address + io.memory_write_value := 0.U }.otherwise { - memory.io.read_2 := false.B - memory.io.write_2 := false.B - memory.io.address_2 := 0.U - memory.io.write_value_2 := 0.U + io.memory_read := false.B + io.memory_write := false.B + io.memory_address := 0.U + io.memory_write_value := 0.U } } @@ -160,7 +158,7 @@ class Core() extends Module { printf("=== Execute 2 ===\n"); printf("Opcode: %b\n", execute_stage_2.io.instruction.opcode); printf("Func3: %b\n", execute_stage_2.io.instruction.func3); - printf("Read Value: %b\n", memory.io.read_value_2); + printf("Read Value: %b\n", execute_stage_2.io.memory_read_value); printf("Write: %b\n", execute_stage_2.io.memory_write); printf("Write Adress: %b\n", execute_stage_2.io.memory_write_address); printf("Write Value: %b\n", execute_stage_2.io.memory_write_value); @@ -184,15 +182,6 @@ class Core() extends Module { printf("08: %b\n", registers.io.debug_8); printf("09: %b\n", registers.io.debug_9); printf("10: %b\n", registers.io.debug_10); - }.otherwise { - printf("Loading...\n"); - - when(io.flash) { - memory.io.read_1 := false.B - memory.io.write_1 := true.B - memory.io.address_1 := io.flash_address - memory.io.write_value_1 := io.flash_value - } } } diff --git a/src/main/scala/RISCV/Main.scala b/src/main/scala/RISCV/Main.scala new file mode 100644 index 0000000..013acb1 --- /dev/null +++ b/src/main/scala/RISCV/Main.scala @@ -0,0 +1,57 @@ +package RISCV + +import chisel3._ +import _root_.circt.stage.ChiselStage +import scala.math._ + +class Main() extends Module { + val io = IO(new Bundle { + val execute = Input(Bool()) + + val flash = Input(Bool()) + val flash_address = Input(UInt(32.W)) + val flash_value = Input(UInt(32.W)) + }) + + val memory = Module(new Memory()) + memory.io.read_1 := true.B + memory.io.write_1 := false.B + memory.io.write_value_1 := 0.U + + memory.io.btns := 0.U + + val core = Module(new Core()) + core.io.execute := io.execute + + memory.io.address_1 := core.io.program_memory_adress + core.io.program_memory_value := memory.io.read_value_1 + + memory.io.address_2 := core.io.memory_address + memory.io.read_2 := core.io.memory_read + memory.io.write_2 := core.io.memory_write + memory.io.write_value_2 := core.io.memory_write_value + core.io.memory_read_value := memory.io.read_value_2 + + when(!io.execute) { + printf("Loading...\n"); + + when(io.flash) { + memory.io.read_1 := false.B + memory.io.write_1 := true.B + memory.io.address_1 := io.flash_address + memory.io.write_value_1 := io.flash_value + } + } +} + +object Main extends App { + ChiselStage.emitSystemVerilogFile( + new Main(), + firtoolOpts = Array( + "-disable-all-randomization", + "-strip-debug-info", + "-default-layer-specialization=enable" + ), + args = Array("--target-dir", "generated") + ) +} \ No newline at end of file diff --git a/src/test/scala/RISCV/MainSpec.scala b/src/test/scala/RISCV/MainSpec.scala new file mode 100644 index 0000000..1857c10 --- /dev/null +++ b/src/test/scala/RISCV/MainSpec.scala @@ -0,0 +1,61 @@ +package RISCV + +import chisel3._ +import chisel3.simulator.scalatest.ChiselSim +import org.scalatest.freespec.AnyFreeSpec +import org.scalatest.matchers.must.Matchers +import scala.io.Source +import java.nio.file.{Files, Paths} +import java.nio.ByteBuffer +import chisel3.simulator.PeekPokeAPI.TestableRecord +import scala.io.Source + +class MainSpec extends AnyFreeSpec with Matchers with ChiselSim { + // "Core should execute program.hex correctly" in { + // simulate(new Core()) { dut => + // val path = getClass.getResource("/program.hex").getPath + // val lines = Source.fromFile(path).getLines().toList + + // dut.io.flash.poke(true.B) + + // lines.zipWithIndex.foreach { case (line, index) => + // val value = java.lang.Long.parseLong(line.trim, 16) + + // dut.io.flash_address.poke((index * 4).U) + // dut.io.flash_value.poke(value.U) + + // dut.clock.step(1) + // } + + // dut.io.flash.poke(false.B) + + // dut.io.execute.poke(true.B) + + // dut.clock.step(16) + // } + // } + + "Main should execute memory.hex correctly" in { + simulate(new Main()) { dut => + val path = getClass.getResource("/memory.hex").getPath + val lines = Source.fromFile(path).getLines().toList + + dut.io.flash.poke(true.B) + + lines.zipWithIndex.foreach { case (line, index) => + val value = java.lang.Long.parseLong(line.trim, 16) + + dut.io.flash_address.poke((index * 4).U) + dut.io.flash_value.poke(value.U) + + dut.clock.step(1) + } + + dut.io.flash.poke(false.B) + + dut.io.execute.poke(true.B) + + dut.clock.step(16) + } + } +} From 671dd50055210772027a1de35af385e3131071ab Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sat, 13 Jun 2026 18:11:29 -0400 Subject: [PATCH 25/33] add vga controller to main --- src/main/scala/RISCV/Main.scala | 20 +++++++++++- src/main/scala/RISCV/Memory.scala | 40 ++++++------------------ src/main/scala/RISCV/VGAController.scala | 18 +++++------ 3 files changed, 36 insertions(+), 42 deletions(-) diff --git a/src/main/scala/RISCV/Main.scala b/src/main/scala/RISCV/Main.scala index 013acb1..bf7f424 100644 --- a/src/main/scala/RISCV/Main.scala +++ b/src/main/scala/RISCV/Main.scala @@ -11,6 +11,14 @@ class Main() extends Module { val flash = Input(Bool()) val flash_address = Input(UInt(32.W)) val flash_value = Input(UInt(32.W)) + + val vga_clk = Input(Clock()); + val hsync = Output(Bool()) + val vsync = Output(Bool()) + val rgb = Output(UInt(12.W)) + val blanking = Output(Bool()) + + val btns = Input(UInt(4.W)) }) val memory = Module(new Memory()) @@ -18,7 +26,17 @@ class Main() extends Module { memory.io.write_1 := false.B memory.io.write_value_1 := 0.U - memory.io.btns := 0.U + memory.io.btns := io.btns + + val vga_controller = Module(new VGAController()) + vga_controller.io.address := memory.io.address_vga + vga_controller.io.write := memory.io.write_vga + vga_controller.io.write_value := memory.io.write_value_vga + vga_controller.io.read_clk := io.vga_clk + io.hsync := vga_controller.io.hsync + io.vsync := vga_controller.io.vsync + io.rgb := vga_controller.io.rgb + io.blanking := vga_controller.io.blanking val core = Module(new Core()) core.io.execute := io.execute diff --git a/src/main/scala/RISCV/Memory.scala b/src/main/scala/RISCV/Memory.scala index 8f2a36d..7d1eeb9 100644 --- a/src/main/scala/RISCV/Memory.scala +++ b/src/main/scala/RISCV/Memory.scala @@ -25,53 +25,31 @@ class Memory() extends Module { val btns = Input(UInt(4.W)) }) - val memory = SyncReadMem(1024, UInt(32.W)) + val memory = SyncReadMem(4096, UInt(32.W)) - io.address_vga := 0.U - io.write_vga := true.B - io.write_value_vga := 0.U - io.read_value_1 := 0.U - io.read_value_2 := 0.U - - val isVGA = io.address_1 >= 0b1000000000000.U; - io.address_vga := Mux(isVGA, io.address_1 / 0b1000000000000.U - 1.U, 0.U); - io.write_vga := isVGA && io.write_1 - io.write_value_vga := io.write_value_1 - - when(io.write_1) { - when(isVGA) { - printf( - "Writing to VGA! Address: %b Data: %b\n", - io.address_1 / 0b1000000000000.U - 1.U, - io.write_value_1 - ); - }.otherwise { - printf( - "Writing to Memory! Address: %b Data: %b\n", - io.address_1, - io.write_value_1 - ); - } - } + val is_vga = io.address_2 >= 0xFFF.U + io.address_vga := io.address_2 - 0xFFF.U + io.write_vga := is_vga && io.write_2 + io.write_value_vga := io.write_value_2 io.read_value_1 := memory.readWrite( io.address_1, io.write_value_1, - (io.read_1 || io.write_1) && !isVGA, + io.read_1 || io.write_1, io.write_1 ) io.read_value_2 := memory.readWrite( io.address_2, io.write_value_2, - (io.read_2 || io.write_2) && !isVGA, + (io.read_2 || io.write_2) && !is_vga, io.write_2 ) val is_btns = RegInit(false.B) - is_btns := io.read_1 && io.address_1 === 0x12c00000.U // 0x4B000000 + is_btns := io.read_2 && io.address_2 === 0x12c00000.U // 0x4B000000 when(is_btns) { - io.read_value_1 := io.btns + io.read_value_2 := io.btns } } diff --git a/src/main/scala/RISCV/VGAController.scala b/src/main/scala/RISCV/VGAController.scala index 8d2573d..c9b331e 100644 --- a/src/main/scala/RISCV/VGAController.scala +++ b/src/main/scala/RISCV/VGAController.scala @@ -27,18 +27,20 @@ class VGAController extends Module { val vsync = Output(Bool()) val rgb = Output(UInt(12.W)) val blanking = Output(Bool()) - }) val memory = SyncReadMem(320 * 240, UInt(8.W)) - - when(io.write) { memory.write(io.address, io.write_value) } - withClockAndReset(io.read_clk,reset) { + io.hsync := true.B + io.vsync := true.B + io.rgb := 0.U + io.blanking := true.B + + withClockAndReset(io.read_clk, reset) { val hCount = RegInit(0.U(10.W)) val vCount = RegInit(0.U(10.W)) @@ -79,13 +81,9 @@ class VGAController extends Module { read_address := vCountMult } - - val color = memory.read(read_address, true.B) + val color = memory.read(read_address, true.B, io.read_clk) val pixel = color(7, 5) ## color(5) ## color(4, 2) ## color(2) ## color(1, 0) ## color(0) ## color(0) io.rgb := Mux(active, pixel, 0.U) - - } - - + } } From df874858d64292705954668c807b471c818f1cc1 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sat, 13 Jun 2026 18:29:18 -0400 Subject: [PATCH 26/33] vga simulation --- README.md | 10 +++- simulation/VGAController.sv | 35 ------------ simulation/frame.png | Bin 273 -> 0 bytes simulation/frame.ppm | 4 -- simulation/vga-image.cpp | 110 +++++++++++++++++++++++++++++------- 5 files changed, 98 insertions(+), 61 deletions(-) delete mode 100644 simulation/VGAController.sv delete mode 100644 simulation/frame.png delete mode 100644 simulation/frame.ppm diff --git a/README.md b/README.md index bcebba8..724f4b9 100644 --- a/README.md +++ b/README.md @@ -136,4 +136,12 @@ nix-shell -p imagemagick --run "convert frame.ppm frame.png" python convert.py -python.exe .\load_program.py .\programs\test.hex --port COM6 \ No newline at end of file +python.exe .\load_program.py .\programs\test.hex --port COM6 + +## New VGA Testing +``` +cd generated +verilator --cc --exe --build -j 0 ../simulation/vga-image.cpp -f filelist.f --top VGAController +./obj_dir/VVGAController +ffmpeg -i frame.ppm frame.png -y +``` \ No newline at end of file diff --git a/simulation/VGAController.sv b/simulation/VGAController.sv deleted file mode 100644 index afac2f3..0000000 --- a/simulation/VGAController.sv +++ /dev/null @@ -1,35 +0,0 @@ -// Generated by CIRCT firtool-1.128.0 -module VGAController( - input clock, - reset, - output io_hsync, - io_vsync, - output [11:0] io_rgb, - output io_blanking, - output [9:0] io_hPos, - io_vPos -); - - reg [9:0] hCount; - reg [9:0] vCount; - wire active = hCount < 10'h280 & vCount < 10'h1E0; - always @(posedge clock) begin - if (reset) begin - hCount <= 10'h0; - vCount <= 10'h0; - end - else begin - automatic logic _GEN = hCount == 10'h31F; - hCount <= _GEN ? 10'h0 : hCount + 10'h1; - if (_GEN) - vCount <= vCount == 10'h20C ? 10'h0 : vCount + 10'h1; - end - end // always @(posedge) - assign io_hsync = ~(hCount > 10'h28F & hCount < 10'h2F0); - assign io_vsync = ~(vCount > 10'h1E9 & vCount < 10'h1EC); - assign io_rgb = {12{active}}; - assign io_blanking = ~active; - assign io_hPos = hCount; - assign io_vPos = vCount; -endmodule - diff --git a/simulation/frame.png b/simulation/frame.png deleted file mode 100644 index 2fc60a34cbf3028b48a81d3e176ac4d020f132e3..0000000000000000000000000000000000000000 GIT binary patch literal 0 HcmV?d00001 literal 273 zcmeAS@N?(olHy`uVBq!ia0y~yU}|7sV0^#`6kw2D_0SVYDI|LY`7$t6sWC7#v@kII z0tz*}U|=XUU|@Kaz`$TNgMmT3V9u^U8=wSJlDE4H1LNH;;Uz%cJWm(LkcwMx&lm#D z<6%bP0l+XkK3UW+E diff --git a/simulation/frame.ppm b/simulation/frame.ppm deleted file mode 100644 index 7cef7bc..0000000 --- a/simulation/frame.ppm +++ /dev/null @@ -1,4 +0,0 @@ -P6 -640 480 -255 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ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ \ No newline at end of file diff --git a/simulation/vga-image.cpp b/simulation/vga-image.cpp index 9b3fc6e..638431b 100644 --- a/simulation/vga-image.cpp +++ b/simulation/vga-image.cpp @@ -3,48 +3,116 @@ #include #include -static constexpr int H_TOTAL = 800; -static constexpr int V_TOTAL = 525; -static constexpr int H_ACTIVE = 640; -static constexpr int V_ACTIVE = 480; +static constexpr int H_VISIBLE = 640; +static constexpr int H_FRONT = 16; +static constexpr int H_SYNC = 96; +static constexpr int H_BACK = 48; +static constexpr int H_TOTAL = H_VISIBLE + H_FRONT + H_SYNC + H_BACK; + +static constexpr int V_VISIBLE = 480; +static constexpr int V_FRONT = 10; +static constexpr int V_SYNC = 2; +static constexpr int V_BACK = 33; +static constexpr int V_TOTAL = V_VISIBLE + V_FRONT + V_SYNC + V_BACK; int main(int argc, char** argv) { Verilated::commandArgs(argc, argv); auto dut = std::make_unique(); - // Reset - dut->reset = 1; dut->clock = 0; + dut->io_write = 0; + dut->io_address = 0; + dut->io_write_value = 0; + + dut->reset = 1; + dut->clock = 0; + dut->io_read_clk = 0; + for (int i = 0; i < 4; i++) { dut->clock ^= 1; + dut->io_read_clk = dut->clock; dut->eval(); } + dut->reset = 0; - // Framebuffer - std::vector pixels(H_ACTIVE * V_ACTIVE * 3, 0); + std::vector pixels(H_VISIBLE * V_VISIBLE * 3, 0); + + int hCount = 0; + int vCount = 0; + + dut->io_write = 1; + dut->io_address = 640 * 480 / 2; + dut->io_write_value = 0b11100000; + + dut->clock = 1; + dut->io_read_clk = 1; + dut->eval(); + dut->clock = 0; + dut->io_read_clk = 0; + dut->eval(); + + dut->io_write = 0; + dut->io_address = 0; + dut->io_write_value = 0; + + dut->clock = 1; + dut->io_read_clk = 1; + dut->eval(); + dut->clock = 0; + dut->io_read_clk = 0; + dut->eval(); + + for (int i = 0; i < 4; i++) { + dut->clock ^= 1; + dut->io_read_clk = dut->clock; + dut->eval(); + } - // Run one full frame for (int cycle = 0; cycle < H_TOTAL * V_TOTAL; cycle++) { - dut->clock = 1; dut->eval(); - dut->clock = 0; dut->eval(); + dut->clock = 1; + dut->io_read_clk = 1; + dut->eval(); if (!dut->io_blanking) { - int x = dut->io_hPos; - int y = dut->io_vPos; - uint16_t rgb12 = dut->io_rgb; - int idx = (y * H_ACTIVE + x) * 3; - pixels[idx + 0] = ((rgb12 >> 8) & 0xF) * 17; - pixels[idx + 1] = ((rgb12 >> 4) & 0xF) * 17; - pixels[idx + 2] = ((rgb12 >> 0) & 0xF) * 17; + int x = hCount; + int y = vCount; + + if (x < H_VISIBLE && y < V_VISIBLE) { + uint16_t rgb12 = dut->io_rgb; + + int idx = (y * H_VISIBLE + x) * 3; + + pixels[idx + 0] = ((rgb12 >> 8) & 0xF) * 17; + pixels[idx + 1] = ((rgb12 >> 4) & 0xF) * 17; + pixels[idx + 2] = ((rgb12 >> 0) & 0xF) * 17; + } + } + + dut->clock = 0; + dut->io_read_clk = 0; + dut->eval(); + + if (hCount == H_TOTAL - 1) { + hCount = 0; + vCount = (vCount == V_TOTAL - 1) ? 0 : vCount + 1; + } else { + hCount++; } } - // Write PPM FILE* f = fopen("frame.ppm", "wb"); - fprintf(f, "P6\n%d %d\n255\n", H_ACTIVE, V_ACTIVE); + + if (!f) { perror("fopen"); return 1; } + + fprintf(f, "P6\n%d %d\n255\n", H_VISIBLE, V_VISIBLE); + fwrite(pixels.data(), 1, pixels.size(), f); + fclose(f); dut->final(); - printf("Wrote frame.ppm\n"); + + printf("Wrote frame.ppm (%dx%d)\n", H_VISIBLE, V_VISIBLE); + + return 0; } \ No newline at end of file From d696dc186000b8009534ad5289753648b4c8e741 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sat, 13 Jun 2026 19:31:51 -0400 Subject: [PATCH 27/33] working simulation writing to vga --- programs/frame-test.asm | 4 + programs/frame-test.hex | 4 + simulate.sh | 4 + simulation/vga-image.cpp | 75 +++++++++++------- src/main/scala/RISCV/Core.scala | 118 ++++++++++++++-------------- src/main/scala/RISCV/Main.scala | 2 +- src/main/scala/RISCV/Memory.scala | 10 +-- src/test/scala/RISCV/MainSpec.scala | 2 +- 8 files changed, 126 insertions(+), 93 deletions(-) create mode 100644 programs/frame-test.asm create mode 100644 programs/frame-test.hex create mode 100755 simulate.sh diff --git a/programs/frame-test.asm b/programs/frame-test.asm new file mode 100644 index 0000000..4fb944c --- /dev/null +++ b/programs/frame-test.asm @@ -0,0 +1,4 @@ +addi x1, x0, 0xE0 +lui x2, 0x3F +addi x2, x2, 0xFC +sw x1, 0(x2) \ No newline at end of file diff --git a/programs/frame-test.hex b/programs/frame-test.hex new file mode 100644 index 0000000..b9ffc03 --- /dev/null +++ b/programs/frame-test.hex @@ -0,0 +1,4 @@ +0e000093 +0003f137 +0fc10113 +00112023 \ No newline at end of file diff --git a/simulate.sh b/simulate.sh new file mode 100755 index 0000000..363be6b --- /dev/null +++ b/simulate.sh @@ -0,0 +1,4 @@ +cd generated +verilator --cc --exe --build -j 0 ../simulation/vga-image.cpp -f filelist.f --top Main +./obj_dir/VMain +ffmpeg -i frame.ppm frame.png -y \ No newline at end of file diff --git a/simulation/vga-image.cpp b/simulation/vga-image.cpp index 638431b..c405bc8 100644 --- a/simulation/vga-image.cpp +++ b/simulation/vga-image.cpp @@ -1,7 +1,8 @@ -#include "VVGAController.h" +#include "VMain.h" #include "verilated.h" #include #include +#include static constexpr int H_VISIBLE = 640; static constexpr int H_FRONT = 16; @@ -17,19 +18,21 @@ static constexpr int V_TOTAL = V_VISIBLE + V_FRONT + V_SYNC + V_BACK; int main(int argc, char** argv) { Verilated::commandArgs(argc, argv); - auto dut = std::make_unique(); + auto dut = std::make_unique(); - dut->io_write = 0; - dut->io_address = 0; - dut->io_write_value = 0; + dut->io_execute = 0; + dut->io_flash = 0; + dut->io_flash_address = 0; + dut->io_flash_value = 0; + dut->io_btns = 0; dut->reset = 1; dut->clock = 0; - dut->io_read_clk = 0; + dut->io_vga_clk = 0; for (int i = 0; i < 4; i++) { dut->clock ^= 1; - dut->io_read_clk = dut->clock; + dut->io_vga_clk = dut->clock; dut->eval(); } @@ -40,37 +43,53 @@ int main(int argc, char** argv) { int hCount = 0; int vCount = 0; - dut->io_write = 1; - dut->io_address = 640 * 480 / 2; - dut->io_write_value = 0b11100000; + std::ifstream file("/home/liamh/RISC-V/programs/frame-test.hex"); - dut->clock = 1; - dut->io_read_clk = 1; - dut->eval(); - dut->clock = 0; - dut->io_read_clk = 0; - dut->eval(); + std::string line; + int address = 0; - dut->io_write = 0; - dut->io_address = 0; - dut->io_write_value = 0; + while (std::getline(file, line)) { + if (line.empty()) continue; - dut->clock = 1; - dut->io_read_clk = 1; - dut->eval(); - dut->clock = 0; - dut->io_read_clk = 0; - dut->eval(); + uint32_t value = std::stoul(line, nullptr, 16); + + dut->io_flash = 1; + dut->io_flash_address = address; + dut->io_flash_value = value; + + printf("Writing %x at %d\n", value, address); + + dut->clock = 1; + dut->io_vga_clk = 1; + dut->eval(); + dut->clock = 0; + dut->io_vga_clk = 0; + dut->eval(); + + address++; + } + + dut->io_flash = 0; + dut->io_flash_address = 0; + dut->io_flash_value = 0; for (int i = 0; i < 4; i++) { dut->clock ^= 1; - dut->io_read_clk = dut->clock; + dut->io_vga_clk = dut->clock; dut->eval(); } + dut->io_execute = 1; + + // for (int i = 0; i < 2 * 8; i++) { + // dut->clock ^= 1; + // dut->io_vga_clk = dut->clock; + // dut->eval(); + // } + for (int cycle = 0; cycle < H_TOTAL * V_TOTAL; cycle++) { dut->clock = 1; - dut->io_read_clk = 1; + dut->io_vga_clk = 1; dut->eval(); if (!dut->io_blanking) { @@ -89,7 +108,7 @@ int main(int argc, char** argv) { } dut->clock = 0; - dut->io_read_clk = 0; + dut->io_vga_clk = 0; dut->eval(); if (hCount == H_TOTAL - 1) { diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index 1ed20b0..7b3808f 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -124,64 +124,66 @@ class Core() extends Module { registers.io.in := write_stage.io.register_value when(io.execute) { - printf("\n\n\n=== Fetch ===\n"); - printf("Program Pointer: %d\n", program_pointer); - printf("Data: %b\n", fetch_stage.io.instruction); - printf("Valid: %b\n", fetch_stage.io.next_valid); - - printf("=== Decode ===\n"); - printf("Opcode: %b\n", decode_stage.io.decoded.opcode); - printf("Immediate: %b\n", decode_stage.io.decoded.immediate); - printf("Rd: %d\n", decode_stage.io.decoded.rd); - printf("Rs1: %d\n", decode_stage.io.decoded.rs1); - printf("Rs2: %d\n", decode_stage.io.decoded.rs2); - printf("Valid: %b\n", decode_stage.io.next_valid); - - printf("=== Read ===\n"); - printf("A: %b\n", read_stage.io.out_a); - printf("B: %b\n", read_stage.io.out_b); - printf("Valid: %b\n", read_stage.io.next_valid); - printf("RAW Flush Requested: %b\n", read_stage.io.raw_hazard_flush); - printf("Jump Target: %d\n", read_stage.io.program_pointer_target); - - printf("=== Execute 1 ===\n"); - printf("Opcode: %b\n", execute_stage_1.io.instruction.opcode); - printf("Func3: %b\n", execute_stage_1.io.instruction.func3); - printf("Out: %b\n", execute_stage_1.io.out); - printf("Valid: %b\n", execute_stage_1.io.next_valid); - printf("Read: %b\n", execute_stage_1.io.memory_read); - printf("Read Adress: %b\n", execute_stage_1.io.memory_read_address); - printf("Jump Flush Requested: %b\n", execute_stage_1.io.program_pointer_jump_flush); - printf("Memory Flush Requested: %b\n", execute_stage_1.io.memory_use_flush); - printf("Jump Target: %d\n", execute_stage_1.io.program_pointer_target); - - printf("=== Execute 2 ===\n"); - printf("Opcode: %b\n", execute_stage_2.io.instruction.opcode); - printf("Func3: %b\n", execute_stage_2.io.instruction.func3); - printf("Read Value: %b\n", execute_stage_2.io.memory_read_value); - printf("Write: %b\n", execute_stage_2.io.memory_write); - printf("Write Adress: %b\n", execute_stage_2.io.memory_write_address); - printf("Write Value: %b\n", execute_stage_2.io.memory_write_value); - printf("Out: %b\n", execute_stage_2.io.out); - printf("Valid: %b\n", execute_stage_2.io.next_valid); - - printf("=== Write ===\n"); - printf("Write: %b\n", write_stage.io.register_write); - printf("Address: %b\n", write_stage.io.register_address); - printf("Value: %b\n", write_stage.io.register_value); - printf("Valid: %b\n", write_stage.io.next_valid); - - printf("=== Dump ===\n"); - printf("01: %b\n", registers.io.debug_1); - printf("02: %b\n", registers.io.debug_2); - printf("03: %b\n", registers.io.debug_3); - printf("04: %b\n", registers.io.debug_4); - printf("05: %b\n", registers.io.debug_5); - printf("06: %b\n", registers.io.debug_6); - printf("07: %b\n", registers.io.debug_7); - printf("08: %b\n", registers.io.debug_8); - printf("09: %b\n", registers.io.debug_9); - printf("10: %b\n", registers.io.debug_10); + // printf("\n\n\n=== Fetch ===\n"); + // printf("Program Pointer: %d\n", program_pointer); + // printf("Data: %b\n", fetch_stage.io.instruction); + // printf("Valid: %b\n", fetch_stage.io.next_valid); + + // printf("=== Decode ===\n"); + // printf("Opcode: %b\n", decode_stage.io.decoded.opcode); + // printf("Immediate: %b\n", decode_stage.io.decoded.immediate); + // printf("Rd: %d\n", decode_stage.io.decoded.rd); + // printf("Rs1: %d\n", decode_stage.io.decoded.rs1); + // printf("Rs2: %d\n", decode_stage.io.decoded.rs2); + // printf("Valid: %b\n", decode_stage.io.next_valid); + + // printf("=== Read ===\n"); + // printf("A: %b\n", read_stage.io.out_a); + // printf("B: %b\n", read_stage.io.out_b); + // printf("Valid: %b\n", read_stage.io.next_valid); + // printf("RAW Flush Requested: %b\n", read_stage.io.raw_hazard_flush); + // printf("Jump Target: %d\n", read_stage.io.program_pointer_target); + + // printf("=== Execute 1 ===\n"); + // printf("Opcode: %b\n", execute_stage_1.io.instruction.opcode); + // printf("Func3: %b\n", execute_stage_1.io.instruction.func3); + // printf("Out: %b\n", execute_stage_1.io.out); + // printf("Valid: %b\n", execute_stage_1.io.next_valid); + // printf("Read: %b\n", execute_stage_1.io.memory_read); + // printf("Read Adress: %b\n", execute_stage_1.io.memory_read_address); + // printf("Jump Flush Requested: %b\n", execute_stage_1.io.program_pointer_jump_flush); + // printf("Memory Flush Requested: %b\n", execute_stage_1.io.memory_use_flush); + // printf("Jump Target: %d\n", execute_stage_1.io.program_pointer_target); + + // printf("=== Execute 2 ===\n"); + // printf("Opcode: %b\n", execute_stage_2.io.instruction.opcode); + // printf("Func3: %b\n", execute_stage_2.io.instruction.func3); + // printf("Read Value: %b\n", execute_stage_2.io.memory_read_value); + // printf("Write: %b\n", execute_stage_2.io.memory_write); + // printf("Write Adress: %b\n", execute_stage_2.io.memory_write_address); + // printf("Write Value: %b\n", execute_stage_2.io.memory_write_value); + // printf("Out: %b\n", execute_stage_2.io.out); + // printf("Valid: %b\n", execute_stage_2.io.next_valid); + + // printf("=== Write ===\n"); + // printf("Write: %b\n", write_stage.io.register_write); + // printf("Address: %b\n", write_stage.io.register_address); + // printf("Value: %b\n", write_stage.io.register_value); + // printf("Valid: %b\n", write_stage.io.next_valid); + + // printf("=== Dump ===\n"); + // printf("01: %b\n", registers.io.debug_1); + // printf("02: %b\n", registers.io.debug_2); + // printf("03: %b\n", registers.io.debug_3); + // printf("04: %b\n", registers.io.debug_4); + // printf("05: %b\n", registers.io.debug_5); + // printf("06: %b\n", registers.io.debug_6); + // printf("07: %b\n", registers.io.debug_7); + // printf("08: %b\n", registers.io.debug_8); + // printf("09: %b\n", registers.io.debug_9); + // printf("10: %b\n", registers.io.debug_10); + + printf("Program Pointer: %d\n", program_pointer); } } diff --git a/src/main/scala/RISCV/Main.scala b/src/main/scala/RISCV/Main.scala index bf7f424..b9a7292 100644 --- a/src/main/scala/RISCV/Main.scala +++ b/src/main/scala/RISCV/Main.scala @@ -41,7 +41,7 @@ class Main() extends Module { val core = Module(new Core()) core.io.execute := io.execute - memory.io.address_1 := core.io.program_memory_adress + memory.io.address_1 := core.io.program_memory_adress / 4.U core.io.program_memory_value := memory.io.read_value_1 memory.io.address_2 := core.io.memory_address diff --git a/src/main/scala/RISCV/Memory.scala b/src/main/scala/RISCV/Memory.scala index 7d1eeb9..c988603 100644 --- a/src/main/scala/RISCV/Memory.scala +++ b/src/main/scala/RISCV/Memory.scala @@ -27,11 +27,6 @@ class Memory() extends Module { val memory = SyncReadMem(4096, UInt(32.W)) - val is_vga = io.address_2 >= 0xFFF.U - io.address_vga := io.address_2 - 0xFFF.U - io.write_vga := is_vga && io.write_2 - io.write_value_vga := io.write_value_2 - io.read_value_1 := memory.readWrite( io.address_1, io.write_value_1, @@ -39,6 +34,11 @@ class Memory() extends Module { io.write_1 ) + val is_vga = io.address_2 >= 0xFFF.U + io.address_vga := io.address_2 - 0xFFF.U + io.write_vga := is_vga && io.write_2 + io.write_value_vga := io.write_value_2 + io.read_value_2 := memory.readWrite( io.address_2, io.write_value_2, diff --git a/src/test/scala/RISCV/MainSpec.scala b/src/test/scala/RISCV/MainSpec.scala index 1857c10..430d26e 100644 --- a/src/test/scala/RISCV/MainSpec.scala +++ b/src/test/scala/RISCV/MainSpec.scala @@ -45,7 +45,7 @@ class MainSpec extends AnyFreeSpec with Matchers with ChiselSim { lines.zipWithIndex.foreach { case (line, index) => val value = java.lang.Long.parseLong(line.trim, 16) - dut.io.flash_address.poke((index * 4).U) + dut.io.flash_address.poke(index.U) dut.io.flash_value.poke(value.U) dut.clock.step(1) From 6c8de4aa0bb80fb27dc6dc72998c15c817711b4b Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 14 Jun 2026 00:40:15 -0400 Subject: [PATCH 28/33] debug vga writing --- programs/frame-test.asm | 4 ++-- programs/frame-test.hex | 4 ++-- src/main/scala/RISCV/Memory.scala | 4 ++-- 3 files changed, 6 insertions(+), 6 deletions(-) diff --git a/programs/frame-test.asm b/programs/frame-test.asm index 4fb944c..f391d46 100644 --- a/programs/frame-test.asm +++ b/programs/frame-test.asm @@ -1,4 +1,4 @@ addi x1, x0, 0xE0 -lui x2, 0x3F -addi x2, x2, 0xFC +lui x2, 0x4 +addi x2, x2, 160 sw x1, 0(x2) \ No newline at end of file diff --git a/programs/frame-test.hex b/programs/frame-test.hex index b9ffc03..20dd863 100644 --- a/programs/frame-test.hex +++ b/programs/frame-test.hex @@ -1,4 +1,4 @@ 0e000093 -0003f137 -0fc10113 +00004137 +0a010113 00112023 \ No newline at end of file diff --git a/src/main/scala/RISCV/Memory.scala b/src/main/scala/RISCV/Memory.scala index c988603..91ff5af 100644 --- a/src/main/scala/RISCV/Memory.scala +++ b/src/main/scala/RISCV/Memory.scala @@ -34,8 +34,8 @@ class Memory() extends Module { io.write_1 ) - val is_vga = io.address_2 >= 0xFFF.U - io.address_vga := io.address_2 - 0xFFF.U + val is_vga = io.address_2 >= 0x1000.U + io.address_vga := io.address_2 - 0x1000.U io.write_vga := is_vga && io.write_2 io.write_value_vga := io.write_value_2 From 6b3c32e1ba50cd2ad447f97c0b1c687c184c30cf Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 14 Jun 2026 14:02:25 -0400 Subject: [PATCH 29/33] simulating multiple frames --- programs/frame-test.asm | 7 ++- programs/frame-test.hex | 7 ++- simulate.sh | 3 +- simulation/vga-image.cpp | 79 ++++++++++++------------ src/main/scala/RISCV/Core.scala | 8 ++- src/main/scala/RISCV/VGAController.scala | 2 + 6 files changed, 59 insertions(+), 47 deletions(-) diff --git a/programs/frame-test.asm b/programs/frame-test.asm index f391d46..9cdee33 100644 --- a/programs/frame-test.asm +++ b/programs/frame-test.asm @@ -1,4 +1,7 @@ +addi x3, x3, 0 addi x1, x0, 0xE0 lui x2, 0x4 -addi x2, x2, 160 -sw x1, 0(x2) \ No newline at end of file +add x4, x2, x3 +sw x1, 0(x4) +addi x3, x3, 1 +jal x0, -12 \ No newline at end of file diff --git a/programs/frame-test.hex b/programs/frame-test.hex index 20dd863..0ae3d79 100644 --- a/programs/frame-test.hex +++ b/programs/frame-test.hex @@ -1,4 +1,7 @@ +00018193 0e000093 00004137 -0a010113 -00112023 \ No newline at end of file +00310233 +00122023 +00118193 +ff5ff06f \ No newline at end of file diff --git a/simulate.sh b/simulate.sh index 363be6b..274d1e7 100755 --- a/simulate.sh +++ b/simulate.sh @@ -1,4 +1,3 @@ cd generated verilator --cc --exe --build -j 0 ../simulation/vga-image.cpp -f filelist.f --top Main -./obj_dir/VMain -ffmpeg -i frame.ppm frame.png -y \ No newline at end of file +./obj_dir/VMain \ No newline at end of file diff --git a/simulation/vga-image.cpp b/simulation/vga-image.cpp index c405bc8..aaa0c7b 100644 --- a/simulation/vga-image.cpp +++ b/simulation/vga-image.cpp @@ -3,6 +3,7 @@ #include #include #include +#include static constexpr int H_VISIBLE = 640; static constexpr int H_FRONT = 16; @@ -81,57 +82,59 @@ int main(int argc, char** argv) { dut->io_execute = 1; - // for (int i = 0; i < 2 * 8; i++) { + // for (int i = 0; i < 2 * 24; i++) { // dut->clock ^= 1; // dut->io_vga_clk = dut->clock; // dut->eval(); // } - for (int cycle = 0; cycle < H_TOTAL * V_TOTAL; cycle++) { - dut->clock = 1; - dut->io_vga_clk = 1; - dut->eval(); - - if (!dut->io_blanking) { - int x = hCount; - int y = vCount; - - if (x < H_VISIBLE && y < V_VISIBLE) { - uint16_t rgb12 = dut->io_rgb; - - int idx = (y * H_VISIBLE + x) * 3; - - pixels[idx + 0] = ((rgb12 >> 8) & 0xF) * 17; - pixels[idx + 1] = ((rgb12 >> 4) & 0xF) * 17; - pixels[idx + 2] = ((rgb12 >> 0) & 0xF) * 17; + while(1) { + for (int cycle = 0; cycle < H_TOTAL * V_TOTAL; cycle++) { + dut->clock = 1; + dut->io_vga_clk = 1; + dut->eval(); + + if (!dut->io_blanking) { + int x = hCount; + int y = vCount; + + if (x < H_VISIBLE && y < V_VISIBLE) { + uint16_t rgb12 = dut->io_rgb; + + int idx = (y * H_VISIBLE + x) * 3; + + pixels[idx + 0] = ((rgb12 >> 8) & 0xF) * 17; + pixels[idx + 1] = ((rgb12 >> 4) & 0xF) * 17; + pixels[idx + 2] = ((rgb12 >> 0) & 0xF) * 17; + } } - } - dut->clock = 0; - dut->io_vga_clk = 0; - dut->eval(); + dut->clock = 0; + dut->io_vga_clk = 0; + dut->eval(); - if (hCount == H_TOTAL - 1) { - hCount = 0; - vCount = (vCount == V_TOTAL - 1) ? 0 : vCount + 1; - } else { - hCount++; + if (hCount == H_TOTAL - 1) { + hCount = 0; + vCount = (vCount == V_TOTAL - 1) ? 0 : vCount + 1; + } else { + hCount++; + } } - } - FILE* f = fopen("frame.ppm", "wb"); + FILE* f = fopen("frame.ppm", "wb"); - if (!f) { perror("fopen"); return 1; } - - fprintf(f, "P6\n%d %d\n255\n", H_VISIBLE, V_VISIBLE); - - fwrite(pixels.data(), 1, pixels.size(), f); - - fclose(f); + if (!f) { perror("fopen"); return 1; } + + fprintf(f, "P6\n%d %d\n255\n", H_VISIBLE, V_VISIBLE); + + fwrite(pixels.data(), 1, pixels.size(), f); + + fclose(f); - dut->final(); + system("ffmpeg -i frame.ppm frame.png -y"); + } - printf("Wrote frame.ppm (%dx%d)\n", H_VISIBLE, V_VISIBLE); + dut->final(); return 0; } \ No newline at end of file diff --git a/src/main/scala/RISCV/Core.scala b/src/main/scala/RISCV/Core.scala index 7b3808f..d2efd7e 100644 --- a/src/main/scala/RISCV/Core.scala +++ b/src/main/scala/RISCV/Core.scala @@ -124,6 +124,8 @@ class Core() extends Module { registers.io.in := write_stage.io.register_value when(io.execute) { + printf("Program Pointer: %d\n", program_pointer); + // printf("\n\n\n=== Fetch ===\n"); // printf("Program Pointer: %d\n", program_pointer); // printf("Data: %b\n", fetch_stage.io.instruction); @@ -138,6 +140,7 @@ class Core() extends Module { // printf("Valid: %b\n", decode_stage.io.next_valid); // printf("=== Read ===\n"); + // printf("Opcode: %b\n", read_stage.io.instruction.opcode); // printf("A: %b\n", read_stage.io.out_a); // printf("B: %b\n", read_stage.io.out_b); // printf("Valid: %b\n", read_stage.io.next_valid); @@ -166,6 +169,7 @@ class Core() extends Module { // printf("Valid: %b\n", execute_stage_2.io.next_valid); // printf("=== Write ===\n"); + // printf("Opcode: %b\n", write_stage.io.instruction.opcode); // printf("Write: %b\n", write_stage.io.register_write); // printf("Address: %b\n", write_stage.io.register_address); // printf("Value: %b\n", write_stage.io.register_value); @@ -181,9 +185,7 @@ class Core() extends Module { // printf("07: %b\n", registers.io.debug_7); // printf("08: %b\n", registers.io.debug_8); // printf("09: %b\n", registers.io.debug_9); - // printf("10: %b\n", registers.io.debug_10); - - printf("Program Pointer: %d\n", program_pointer); + // printf("10: %b\n", registers.io.debug_10); } } diff --git a/src/main/scala/RISCV/VGAController.scala b/src/main/scala/RISCV/VGAController.scala index c9b331e..0268c6b 100644 --- a/src/main/scala/RISCV/VGAController.scala +++ b/src/main/scala/RISCV/VGAController.scala @@ -33,6 +33,8 @@ class VGAController extends Module { when(io.write) { memory.write(io.address, io.write_value) + + printf("\n\nWRITING TO VGA: %d %b\n\n", io.address, io.write_value); } io.hsync := true.B From 3e7abb820e558292ec9e8e7b3a9a1ae7e2ac0d36 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 14 Jun 2026 14:38:12 -0400 Subject: [PATCH 30/33] working live simulated pong program --- compile.bat | 4 +- compile.sh | 11 + convert.py | 4 +- mill | 241 --------------------- programs/example.bin | Bin 32 -> 0 bytes programs/fib-loop.bin | Bin 60 -> 0 bytes programs/fib.bin | Bin 48 -> 0 bytes programs/frame-test.hex | 7 - programs/hello.c | 138 ++++++------ programs/hello.hex | 446 +++++++++++++++++---------------------- programs/hello.s | 78 ------- programs/mandelbrot.hex | 196 ----------------- programs/test.hex | 10 - simulation/vga-image.cpp | 77 ++++--- 14 files changed, 319 insertions(+), 893 deletions(-) create mode 100755 compile.sh delete mode 100755 mill delete mode 100644 programs/example.bin delete mode 100644 programs/fib-loop.bin delete mode 100644 programs/fib.bin delete mode 100644 programs/frame-test.hex delete mode 100644 programs/hello.s delete mode 100644 programs/mandelbrot.hex delete mode 100644 programs/test.hex diff --git a/compile.bat b/compile.bat index de475b5..c077432 100644 --- a/compile.bat +++ b/compile.bat @@ -4,6 +4,4 @@ .\xpack-riscv-none-elf-gcc-15.2.0-1\bin\riscv-none-elf-objcopy.exe -O binary ./programs/hello.elf ./programs/hello.bin -python convert.py - -python.exe .\load_program.py .\programs\hello.hex --port COM6 \ No newline at end of file +python convert.py \ No newline at end of file diff --git a/compile.sh b/compile.sh new file mode 100755 index 0000000..fca265a --- /dev/null +++ b/compile.sh @@ -0,0 +1,11 @@ +./xpack-riscv-none-elf-gcc-15.2.0-1/bin/riscv-none-elf-gcc -c -O0 -march=rv32i -mabi=ilp32 ./programs/hello.c -o ./programs/hello.o + +./xpack-riscv-none-elf-gcc-15.2.0-1/bin/riscv-none-elf-gcc -march=rv32i -mabi=ilp32 -nostdlib "-Wl,--section-start=.text=0x0,--entry=_start" -o ./programs/hello.elf ./programs/hello.o + +./xpack-riscv-none-elf-gcc-15.2.0-1/bin/riscv-none-elf-objcopy -O binary ./programs/hello.elf ./programs/hello.bin + +python convert.py + +rm ./programs/hello.bin +rm ./programs/hello.elf +rm ./programs/hello.o \ No newline at end of file diff --git a/convert.py b/convert.py index 1d1acc4..955be72 100644 --- a/convert.py +++ b/convert.py @@ -1,7 +1,7 @@ -with open("./programs/mandelbrot.bin", "rb") as f: +with open("./programs/hello.bin", "rb") as f: data = f.read() -with open("./programs/mandelbrot.hex", "w") as f: +with open("./programs/hello.hex", "w") as f: for i in range(0, len(data), 4): word = data[i:i+4] val = int.from_bytes(word, "little") diff --git a/mill b/mill deleted file mode 100755 index 8eda811..0000000 --- a/mill +++ /dev/null @@ -1,241 +0,0 @@ -#!/usr/bin/env sh - -# This is a wrapper script, that automatically download mill from GitHub release pages -# You can give the required mill version with --mill-version parameter -# If no version is given, it falls back to the value of DEFAULT_MILL_VERSION -# -# Original Project page: https://github.com/lefou/millw -# Script Version: 0.4.12 -# -# If you want to improve this script, please also contribute your changes back! -# -# Licensed under the Apache License, Version 2.0 - -set -e - -if [ -z "${DEFAULT_MILL_VERSION}" ] ; then - DEFAULT_MILL_VERSION=0.12.5 -fi - - -if [ -z "${GITHUB_RELEASE_CDN}" ] ; then - GITHUB_RELEASE_CDN="" -fi - - -MILL_REPO_URL="https://github.com/com-lihaoyi/mill" - -if [ -z "${CURL_CMD}" ] ; then - CURL_CMD=curl -fi - -# Explicit commandline argument takes precedence over all other methods -if [ "$1" = "--mill-version" ] ; then - shift - if [ "x$1" != "x" ] ; then - MILL_VERSION="$1" - shift - else - echo "You specified --mill-version without a version." 1>&2 - echo "Please provide a version that matches one provided on" 1>&2 - echo "${MILL_REPO_URL}/releases" 1>&2 - false - fi -fi - -# Please note, that if a MILL_VERSION is already set in the environment, -# We reuse it's value and skip searching for a value. - -# If not already set, read .mill-version file -if [ -z "${MILL_VERSION}" ] ; then - if [ -f ".mill-version" ] ; then - MILL_VERSION="$(tr '\r' '\n' < .mill-version | head -n 1 2> /dev/null)" - elif [ -f ".config/mill-version" ] ; then - MILL_VERSION="$(tr '\r' '\n' < .config/mill-version | head -n 1 2> /dev/null)" - fi -fi - -MILL_USER_CACHE_DIR="${XDG_CACHE_HOME:-${HOME}/.cache}/mill" - -if [ -z "${MILL_DOWNLOAD_PATH}" ] ; then - MILL_DOWNLOAD_PATH="${MILL_USER_CACHE_DIR}/download" -fi - -# If not already set, try to fetch newest from Github -if [ -z "${MILL_VERSION}" ] ; then - # TODO: try to load latest version from release page - echo "No mill version specified." 1>&2 - echo "You should provide a version via '.mill-version' file or --mill-version option." 1>&2 - - mkdir -p "${MILL_DOWNLOAD_PATH}" - LANG=C touch -d '1 hour ago' "${MILL_DOWNLOAD_PATH}/.expire_latest" 2>/dev/null || ( - # we might be on OSX or BSD which don't have -d option for touch - # but probably a -A [-][[hh]mm]SS - touch "${MILL_DOWNLOAD_PATH}/.expire_latest"; touch -A -010000 "${MILL_DOWNLOAD_PATH}/.expire_latest" - ) || ( - # in case we still failed, we retry the first touch command with the intention - # to show the (previously suppressed) error message - LANG=C touch -d '1 hour ago' "${MILL_DOWNLOAD_PATH}/.expire_latest" - ) - - # POSIX shell variant of bash's -nt operator, see https://unix.stackexchange.com/a/449744/6993 - # if [ "${MILL_DOWNLOAD_PATH}/.latest" -nt "${MILL_DOWNLOAD_PATH}/.expire_latest" ] ; then - if [ -n "$(find -L "${MILL_DOWNLOAD_PATH}/.latest" -prune -newer "${MILL_DOWNLOAD_PATH}/.expire_latest")" ]; then - # we know a current latest version - MILL_VERSION=$(head -n 1 "${MILL_DOWNLOAD_PATH}"/.latest 2> /dev/null) - fi - - if [ -z "${MILL_VERSION}" ] ; then - # we don't know a current latest version - echo "Retrieving latest mill version ..." 1>&2 - LANG=C ${CURL_CMD} -s -i -f -I ${MILL_REPO_URL}/releases/latest 2> /dev/null | grep --ignore-case Location: | sed s'/^.*tag\///' | tr -d '\r\n' > "${MILL_DOWNLOAD_PATH}/.latest" - MILL_VERSION=$(head -n 1 "${MILL_DOWNLOAD_PATH}"/.latest 2> /dev/null) - fi - - if [ -z "${MILL_VERSION}" ] ; then - # Last resort - MILL_VERSION="${DEFAULT_MILL_VERSION}" - echo "Falling back to hardcoded mill version ${MILL_VERSION}" 1>&2 - else - echo "Using mill version ${MILL_VERSION}" 1>&2 - fi -fi - -MILL="${MILL_DOWNLOAD_PATH}/${MILL_VERSION}" - -try_to_use_system_mill() { - if [ "$(uname)" != "Linux" ]; then - return 0 - fi - - MILL_IN_PATH="$(command -v mill || true)" - - if [ -z "${MILL_IN_PATH}" ]; then - return 0 - fi - - SYSTEM_MILL_FIRST_TWO_BYTES=$(head --bytes=2 "${MILL_IN_PATH}") - if [ "${SYSTEM_MILL_FIRST_TWO_BYTES}" = "#!" ]; then - # MILL_IN_PATH is (very likely) a shell script and not the mill - # executable, ignore it. - return 0 - fi - - SYSTEM_MILL_PATH=$(readlink -e "${MILL_IN_PATH}") - SYSTEM_MILL_SIZE=$(stat --format=%s "${SYSTEM_MILL_PATH}") - SYSTEM_MILL_MTIME=$(stat --format=%y "${SYSTEM_MILL_PATH}") - - if [ ! -d "${MILL_USER_CACHE_DIR}" ]; then - mkdir -p "${MILL_USER_CACHE_DIR}" - fi - - SYSTEM_MILL_INFO_FILE="${MILL_USER_CACHE_DIR}/system-mill-info" - if [ -f "${SYSTEM_MILL_INFO_FILE}" ]; then - parseSystemMillInfo() { - LINE_NUMBER="${1}" - # Select the line number of the SYSTEM_MILL_INFO_FILE, cut the - # variable definition in that line in two halves and return - # the value, and finally remove the quotes. - sed -n "${LINE_NUMBER}p" "${SYSTEM_MILL_INFO_FILE}" |\ - cut -d= -f2 |\ - sed 's/"\(.*\)"/\1/' - } - - CACHED_SYSTEM_MILL_PATH=$(parseSystemMillInfo 1) - CACHED_SYSTEM_MILL_VERSION=$(parseSystemMillInfo 2) - CACHED_SYSTEM_MILL_SIZE=$(parseSystemMillInfo 3) - CACHED_SYSTEM_MILL_MTIME=$(parseSystemMillInfo 4) - - if [ "${SYSTEM_MILL_PATH}" = "${CACHED_SYSTEM_MILL_PATH}" ] \ - && [ "${SYSTEM_MILL_SIZE}" = "${CACHED_SYSTEM_MILL_SIZE}" ] \ - && [ "${SYSTEM_MILL_MTIME}" = "${CACHED_SYSTEM_MILL_MTIME}" ]; then - if [ "${CACHED_SYSTEM_MILL_VERSION}" = "${MILL_VERSION}" ]; then - MILL="${SYSTEM_MILL_PATH}" - return 0 - else - return 0 - fi - fi - fi - - SYSTEM_MILL_VERSION=$(${SYSTEM_MILL_PATH} --version | head -n1 | sed -n 's/^Mill.*version \(.*\)/\1/p') - - cat < "${SYSTEM_MILL_INFO_FILE}" -CACHED_SYSTEM_MILL_PATH="${SYSTEM_MILL_PATH}" -CACHED_SYSTEM_MILL_VERSION="${SYSTEM_MILL_VERSION}" -CACHED_SYSTEM_MILL_SIZE="${SYSTEM_MILL_SIZE}" -CACHED_SYSTEM_MILL_MTIME="${SYSTEM_MILL_MTIME}" -EOF - - if [ "${SYSTEM_MILL_VERSION}" = "${MILL_VERSION}" ]; then - MILL="${SYSTEM_MILL_PATH}" - fi -} -try_to_use_system_mill - -# If not already downloaded, download it -if [ ! -s "${MILL}" ] ; then - - # support old non-XDG download dir - MILL_OLD_DOWNLOAD_PATH="${HOME}/.mill/download" - OLD_MILL="${MILL_OLD_DOWNLOAD_PATH}/${MILL_VERSION}" - if [ -x "${OLD_MILL}" ] ; then - MILL="${OLD_MILL}" - else - case $MILL_VERSION in - 0.0.* | 0.1.* | 0.2.* | 0.3.* | 0.4.* ) - DOWNLOAD_SUFFIX="" - DOWNLOAD_FROM_MAVEN=0 - ;; - 0.5.* | 0.6.* | 0.7.* | 0.8.* | 0.9.* | 0.10.* | 0.11.0-M* ) - DOWNLOAD_SUFFIX="-assembly" - DOWNLOAD_FROM_MAVEN=0 - ;; - *) - DOWNLOAD_SUFFIX="-assembly" - DOWNLOAD_FROM_MAVEN=1 - ;; - esac - - DOWNLOAD_FILE=$(mktemp mill.XXXXXX) - - if [ "$DOWNLOAD_FROM_MAVEN" = "1" ] ; then - DOWNLOAD_URL="https://repo1.maven.org/maven2/com/lihaoyi/mill-dist/${MILL_VERSION}/mill-dist-${MILL_VERSION}.jar" - else - MILL_VERSION_TAG=$(echo "$MILL_VERSION" | sed -E 's/([^-]+)(-M[0-9]+)?(-.*)?/\1\2/') - DOWNLOAD_URL="${GITHUB_RELEASE_CDN}${MILL_REPO_URL}/releases/download/${MILL_VERSION_TAG}/${MILL_VERSION}${DOWNLOAD_SUFFIX}" - unset MILL_VERSION_TAG - fi - - # TODO: handle command not found - echo "Downloading mill ${MILL_VERSION} from ${DOWNLOAD_URL} ..." 1>&2 - ${CURL_CMD} -f -L -o "${DOWNLOAD_FILE}" "${DOWNLOAD_URL}" - chmod +x "${DOWNLOAD_FILE}" - mkdir -p "${MILL_DOWNLOAD_PATH}" - mv "${DOWNLOAD_FILE}" "${MILL}" - - unset DOWNLOAD_FILE - unset DOWNLOAD_SUFFIX - fi -fi - -if [ -z "$MILL_MAIN_CLI" ] ; then - MILL_MAIN_CLI="${0}" -fi - -MILL_FIRST_ARG="" -if [ "$1" = "--bsp" ] || [ "$1" = "-i" ] || [ "$1" = "--interactive" ] || [ "$1" = "--no-server" ] || [ "$1" = "--repl" ] || [ "$1" = "--help" ] ; then - # Need to preserve the first position of those listed options - MILL_FIRST_ARG=$1 - shift -fi - -unset MILL_DOWNLOAD_PATH -unset MILL_OLD_DOWNLOAD_PATH -unset OLD_MILL -unset MILL_VERSION -unset MILL_REPO_URL - -# We don't quote MILL_FIRST_ARG on purpose, so we can expand the empty value without quotes -# shellcheck disable=SC2086 -exec "${MILL}" $MILL_FIRST_ARG -D "mill.main.cli=${MILL_MAIN_CLI}" "$@" \ No newline at end of file diff --git a/programs/example.bin b/programs/example.bin deleted file mode 100644 index eed82c75d17990595a4442c33401d19b1e4d2681..0000000000000000000000000000000000000000 GIT binary patch literal 0 HcmV?d00001 literal 32 ncmcC(V3=IX&?tPck#TY}W0SC56Vqe{MrQGUhna;LoSB6IrPB!V diff --git a/programs/fib-loop.bin b/programs/fib-loop.bin deleted file mode 100644 index 78c56bce33d9ff4c26ddc59f781d6dbd038072bc..0000000000000000000000000000000000000000 GIT binary patch literal 0 HcmV?d00001 literal 60 zcmZQzV3^Dxz$nbX$SVH7l~tHQR6&_RRY{q_fORrME1NKbLgQuzGoTnFP#t5VFoPSL O@c*x^lmD?!c?Z>Vsfsd#A(JtKtC}){W7B4aPz_}O Dtj7oq diff --git a/programs/frame-test.hex b/programs/frame-test.hex deleted file mode 100644 index 0ae3d79..0000000 --- a/programs/frame-test.hex +++ /dev/null @@ -1,7 +0,0 @@ -00018193 -0e000093 -00004137 -00310233 -00122023 -00118193 -ff5ff06f \ No newline at end of file diff --git a/programs/hello.c b/programs/hello.c index 4892496..3bedc65 100644 --- a/programs/hello.c +++ b/programs/hello.c @@ -2,12 +2,12 @@ __attribute__((naked)) void _start(void) { __asm__ volatile( "li sp, 0x4000\n" // top of 32KB RAM "call main\n" - "loop: j loop\n"); + "loop: j loop\n" + ); } int main() { - volatile unsigned char* frame = (volatile unsigned char*)0x0; - volatile unsigned char* btns = (volatile unsigned char*)0x4B000000; + volatile unsigned int* frame = (volatile unsigned int*)0x4000; int paddY1 = 120; int paddY2 = 120; @@ -16,100 +16,96 @@ int main() { int ballY = 120; int dX = 1; int dY = 1; - + for (int i = 0; i < 320; i++) { - frame[0x4000 * i] = 0xFF; - frame[0x4000 * (239 * 320 + i)] = 0xFF; - frame[0x4000 * (320 * i + 1)] = 0xFF; - frame[0x4000 * (320 * i + 319)] = 0xFF; + frame[i] = 0xFF; + frame[239 * 320 + i] = 0xFF; + frame[320 * i + 1] = 0xFF; + frame[320 * i + 319] = 0xFF; } - int counter = 0; - while (1) { - counter += 1; - - if (counter == 8000) { - counter = 0; - - for (int x = -2; x <= 2; x++) { - for (int y = -2; y <= 2; y++) { - frame[0x4000 * (320 * (ballY + y) + ballX + x)] = 0x00; - } + for (int x = -2; x <= 2; x++) { + for (int y = -2; y <= 2; y++) { + frame[320 * (ballY + y) + ballX + x] = 0x00; } + } - for (int x = -2; x <= 2; x++) { - for (int y = -20; y <= 20; y++) { - frame[0x4000 * (320 * (paddY1 + y) + 20 + x)] = 0x00; - } + for (int x = -2; x <= 2; x++) { + for (int y = -20; y <= 20; y++) { + frame[320 * (paddY1 + y) + 20 + x] = 0x00; } + } - for (int x = -2; x <= 2; x++) { - for (int y = -20; y <= 20; y++) { - frame[0x4000 * (320 * (paddY2 + y) + 299 + x)] = 0x00; - } + for (int x = -2; x <= 2; x++) { + for (int y = -20; y <= 20; y++) { + frame[320 * (paddY2 + y) + 299 + x] = 0x00; } + } - if (*btns & 0b0001 && paddY1 < 239 - 21) { - paddY1 += 1; - } + // if (*btns & 0b0001 && paddY1 < 239 - 21) { + // paddY1 += 1; + // } - if (*btns & 0b0010 && paddY1 > 21) { - paddY1 -= 1; - } + // if (*btns & 0b0010 && paddY1 > 21) { + // paddY1 -= 1; + // } - if (*btns & 0b0100 && paddY2 < 239 - 21) { - paddY2 += 1; - } + // if (*btns & 0b0100 && paddY2 < 239 - 21) { + // paddY2 += 1; + // } - if (*btns & 0b1000 && paddY2 > 21) { - paddY2 -= 1; - } + // if (*btns & 0b1000 && paddY2 > 21) { + // paddY2 -= 1; + // } - ballX += dX; - ballY += dY; + ballX += dX; + ballY += dY; - if (ballX == 319 - 6) { - dX = -1; - } + if (ballX == 319 - 6) { + dX = -1; + } - if (ballX == 6) { - dX = 1; - } + if (ballX == 6) { + dX = 1; + } - if (ballY == 239 - 6) { - dY = -1; - } + if (ballY == 239 - 6) { + dY = -1; + } - if (ballY == 6) { - dY = 1; - } + if (ballY == 6) { + dY = 1; + } - if (ballX <= 25 && ballX >= 15 && ballY <= paddY1 + 25 && ballY >= paddY1 - 25) { - dX = 1; - } + if (ballX <= 25 && ballX >= 15 && ballY <= paddY1 + 25 && ballY >= paddY1 - 25) { + dX = 1; + } - if (ballX <= 304 && ballX >= 294 && ballY <= paddY2 + 25 && ballY >= paddY2 - 25) { - dX = -1; - } + if (ballX <= 304 && ballX >= 294 && ballY <= paddY2 + 25 && ballY >= paddY2 - 25) { + dX = -1; + } - for (int x = -2; x <= 2; x++) { - for (int y = -2; y <= 2; y++) { - frame[0x4000 * (320 * (ballY + y) + ballX + x)] = 0xFF; - } + for (int x = -2; x <= 2; x++) { + for (int y = -2; y <= 2; y++) { + frame[320 * (ballY + y) + ballX + x] = 0xFF; } + } - for (int x = -2; x <= 2; x++) { - for (int y = -20; y <= 20; y++) { - frame[0x4000 * (320 * (paddY1 + y) + 20 + x)] = 0x03; - } + for (int x = -2; x <= 2; x++) { + for (int y = -20; y <= 20; y++) { + frame[320 * (paddY1 + y) + 20 + x] = 0x03; } + } - for (int x = -2; x <= 2; x++) { - for (int y = -20; y <= 20; y++) { - frame[0x4000 * (320 * (paddY2 + y) + 299 + x)] = 0xE0; - } + for (int x = -2; x <= 2; x++) { + for (int y = -20; y <= 20; y++) { + frame[320 * (paddY2 + y) + 299 + x] = 0xE0; } } + + for (int i = 0; i < 8000; i++) { + __asm__ volatile("nop"); + } } } \ No newline at end of file diff --git a/programs/hello.hex b/programs/hello.hex index 1fede73..4f2339d 100644 --- a/programs/hello.hex +++ b/programs/hello.hex @@ -6,386 +6,330 @@ f9010113 06112623 06812423 07010413 -f8042e23 -4b0007b7 -f8f42c23 +000047b7 +faf42223 07800793 -fef42623 +faf42023 07800793 -fef42423 +f8f42e23 0a000793 -fef42223 +fef42623 07800793 -fef42023 +fef42423 00100793 -fcf42e23 +fef42223 00100793 -fcf42c23 -fc042a23 -0b40006f -fd442783 -00e79793 -00078713 -f9c42783 -00e787b3 -fff00713 -00e78023 -fd442703 +fef42023 +fc042e23 +09c0006f +fdc42783 +00279793 +fa442703 +00f707b3 +0ff00713 +00e7a023 +fdc42703 000137b7 ac078793 00f707b3 -00e79793 -00078713 -f9c42783 -00e787b3 -fff00713 -00e78023 -fd442703 +00279793 +fa442703 +00f707b3 +0ff00713 +00e7a023 +fdc42703 00070793 00279793 00e787b3 -00679793 -00178793 -00e79793 -00078713 -f9c42783 -00e787b3 -fff00713 -00e78023 -fd442703 +00879793 +00478793 +fa442703 +00f707b3 +0ff00713 +00e7a023 +fdc42703 00070793 00279793 00e787b3 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a/programs/hello.s +++ /dev/null @@ -1,78 +0,0 @@ - .file "hello.c" - .option nopic - .attribute arch, "rv32i2p1" - .attribute unaligned_access, 0 - .attribute stack_align, 16 - .text - .align 2 - .globl _start - .type _start, @function -_start: - #APP -# 2 "./programs/hello.c" 1 - li sp, 0x4000 -call main -loop: j loop - -# 0 "" 2 - #NO_APP - nop - .size _start, .-_start - .align 2 - .globl main - .type main, @function -main: - addi sp,sp,-48 - sw ra,44(sp) - sw s0,40(sp) - addi s0,sp,48 - sw zero,-28(s0) - sw zero,-32(s0) - sw zero,-36(s0) - sw zero,-20(s0) - j .L3 -.L4: - lw a5,-20(s0) - slli a5,a5,14 - mv a4,a5 - lw a5,-28(s0) - add a5,a5,a4 - li a4,-1 - sb a4,0(a5) - lw a4,-20(s0) - li a5,36864 - addi a5,a5,1216 - add a5,a4,a5 - slli a5,a5,14 - mv a4,a5 - lw a5,-28(s0) - add a5,a5,a4 - li a4,-1 - sb a4,0(a5) - lw a5,-20(s0) - addi a5,a5,1 - sw a5,-20(s0) -.L3: - lw a4,-20(s0) - li a5,319 - ble a4,a5,.L4 -.L7: - sw zero,-24(s0) - j .L5 -.L6: - #APP -# 24 "./programs/hello.c" 1 - nop -# 0 "" 2 - #NO_APP - lw a5,-24(s0) - addi a5,a5,1 - sw a5,-24(s0) -.L5: - lw a4,-24(s0) - li a5,1999 - ble a4,a5,.L6 - j .L7 - .size main, .-main - .ident "GCC: (xPack GNU RISC-V Embedded GCC x86_64) 15.2.0" - .section .note.GNU-stack,"",@progbits diff --git a/programs/mandelbrot.hex b/programs/mandelbrot.hex deleted file mode 100644 index 7c3a3cc..0000000 --- a/programs/mandelbrot.hex +++ /dev/null @@ -1,196 +0,0 @@ -00004137 -268000ef -0000006f -00000013 -fa010113 -04112e23 -04812c23 -06010413 -faa42623 -fab42423 -fac42223 -fad42023 -fa842703 -fa042783 -40f707b3 -fcf42623 -fa042703 -00070793 -00479793 -40e787b3 -00479793 -66666737 -66770713 -02e79733 -40775713 -41f7d793 -40e787b3 -fa442703 -00f707b3 -fcf42423 -fa042783 -66666737 -66770713 -02e79733 -40675713 -41f7d793 -40f707b3 -fef42623 -fa042783 -66666737 -66770713 -02e79733 -40675713 -41f7d793 -40f707b3 -fef42423 -fec42783 -00f04663 -00100793 -fef42623 -fe842783 -00f04663 -00100793 -fef42423 -fe042223 -16c0006f -fe442703 -fe842783 -02f707b3 -fc842703 -00f707b3 -fcf42223 -fe042023 -1340006f -fe042703 -fec42783 -02f707b3 -fcc42703 -00f707b3 -fcf42023 -fc042e23 -fc042c23 -fc042a23 -0840006f -fdc42783 -02f787b3 -40a7d793 -faf42e23 -fd842783 -02f787b3 -40a7d793 -faf42c23 -fbc42703 -fb842783 -00f70733 -000017b7 -06e7c063 -fbc42703 -fb842783 -40f707b3 -fc042703 -00f707b3 -faf42a23 -fdc42703 -fd842783 -02f707b3 -00179793 -40a7d793 -fc442703 -00f707b3 -fcf42c23 -fb442783 -fcf42e23 -fd442783 -00178793 -fcf42a23 -fd442703 -01f00793 -f6e7dce3 -0080006f -00000013 -fd442703 -02000793 -00f71663 -fc0409a3 -0200006f -fd442783 -0ff7f793 -00078713 -00070793 -00379793 -40e787b3 -fcf409a3 -fe442703 -00070793 -00279793 -00e787b3 -00679793 -00078713 -fe042783 -00f707b3 -00e79793 -00078713 -fac42783 -00e787b3 -fd344703 -00e78023 -fe042783 -00178793 -fef42023 -fe042703 -13f00793 -ece7d4e3 -fe442783 -00178793 -fef42223 -fe442703 -0ef00793 -e8e7d8e3 -00000013 -00000013 -05c12083 -05812403 -06010113 -00008067 -fd010113 -02112623 -02812423 -03010413 -fe042023 -d0000793 -fcf42e23 -fc042c23 -fe042623 -60000793 -fef42423 -fe042223 -0340006f -fe842703 -00070793 -00179793 -00e787b3 -41f7d713 -00377713 -00f707b3 -4027d793 -fef42423 -fe442783 -00178793 -fef42223 -fe442703 -fec42783 -fcf744e3 -fe842683 -fd842603 -fdc42583 -fe042503 -d25ff0ef -fec42783 -00178793 -fef42623 -fec42703 -00800793 -f8e7d6e3 -fe042623 -f85ff06f diff --git a/programs/test.hex b/programs/test.hex deleted file mode 100644 index 012f1e8..0000000 --- a/programs/test.hex +++ /dev/null @@ -1,10 +0,0 @@ -00004137 -000041b7 -7d000293 -00108093 -00218133 -00110023 -00000213 -00120213 -fe521ee3 -fe9ff06f \ No newline at end of file diff --git a/simulation/vga-image.cpp b/simulation/vga-image.cpp index aaa0c7b..572ec2a 100644 --- a/simulation/vga-image.cpp +++ b/simulation/vga-image.cpp @@ -44,7 +44,7 @@ int main(int argc, char** argv) { int hCount = 0; int vCount = 0; - std::ifstream file("/home/liamh/RISC-V/programs/frame-test.hex"); + std::ifstream file("/home/liamh/RISC-V/programs/hello.hex"); std::string line; int address = 0; @@ -82,59 +82,68 @@ int main(int argc, char** argv) { dut->io_execute = 1; - // for (int i = 0; i < 2 * 24; i++) { + // for (int i = 0; i < 2 * 64; i++) { // dut->clock ^= 1; // dut->io_vga_clk = dut->clock; // dut->eval(); // } - while(1) { + bool prev_vsync = 1; + int pixelIdx = 0; + + while (1) { + pixelIdx = 0; + + while (true) { + dut->clock = 1; dut->io_vga_clk = 1; dut->eval(); + bool vsync = dut->io_vsync; + dut->clock = 0; dut->io_vga_clk = 0; dut->eval(); + + if (prev_vsync && !vsync) break; + prev_vsync = vsync; + } + prev_vsync = 0; + for (int cycle = 0; cycle < H_TOTAL * V_TOTAL; cycle++) { - dut->clock = 1; - dut->io_vga_clk = 1; - dut->eval(); - - if (!dut->io_blanking) { - int x = hCount; - int y = vCount; - - if (x < H_VISIBLE && y < V_VISIBLE) { - uint16_t rgb12 = dut->io_rgb; - - int idx = (y * H_VISIBLE + x) * 3; - - pixels[idx + 0] = ((rgb12 >> 8) & 0xF) * 17; - pixels[idx + 1] = ((rgb12 >> 4) & 0xF) * 17; - pixels[idx + 2] = ((rgb12 >> 0) & 0xF) * 17; - } - } + dut->clock = 1; dut->io_vga_clk = 1; dut->eval(); + + bool vsync = dut->io_vsync; + bool blanking = dut->io_blanking; + uint16_t rgb12 = dut->io_rgb; - dut->clock = 0; - dut->io_vga_clk = 0; - dut->eval(); + dut->clock = 0; dut->io_vga_clk = 0; dut->eval(); - if (hCount == H_TOTAL - 1) { - hCount = 0; - vCount = (vCount == V_TOTAL - 1) ? 0 : vCount + 1; - } else { - hCount++; + if (prev_vsync && !vsync) { + printf("vsync mid-frame at cycle %d — counter mismatch!\n", cycle); + } + prev_vsync = vsync; + + if (!blanking && pixelIdx < H_VISIBLE * V_VISIBLE) { + pixels[pixelIdx * 3 + 0] = ((rgb12 >> 8) & 0xF) * 17; + pixels[pixelIdx * 3 + 1] = ((rgb12 >> 4) & 0xF) * 17; + pixels[pixelIdx * 3 + 2] = ((rgb12 >> 0) & 0xF) * 17; + pixelIdx++; } } - FILE* f = fopen("frame.ppm", "wb"); + printf("Captured %d pixels (expected %d)\n", pixelIdx, H_VISIBLE * V_VISIBLE); + FILE* f = fopen("frame.ppm", "wb"); if (!f) { perror("fopen"); return 1; } - fprintf(f, "P6\n%d %d\n255\n", H_VISIBLE, V_VISIBLE); - fwrite(pixels.data(), 1, pixels.size(), f); - fclose(f); - system("ffmpeg -i frame.ppm frame.png -y"); } dut->final(); + FILE* f = fopen("frame.ppm", "wb"); + if (!f) { perror("fopen"); return 1; } + fprintf(f, "P6\n%d %d\n255\n", H_VISIBLE, V_VISIBLE); + fwrite(pixels.data(), 1, pixels.size(), f); + fclose(f); + system("ffmpeg -i frame.ppm frame.png -y"); + return 0; } \ No newline at end of file From a5edfef57d5997c170cc8127d76bfbd95496df90 Mon Sep 17 00:00:00 2001 From: Liam Hanrahan Date: Sun, 14 Jun 2026 15:30:19 -0400 Subject: [PATCH 31/33] update vivado proejct --- .../sources_1/ip/clk_wiz_0/clk_wiz_0.xml | 4 +- .../ip/clk_wiz_0/clk_wiz_0_sim_netlist.v | 12 +- .../ip/clk_wiz_0/clk_wiz_0_sim_netlist.vhdl | 16 +- .../sources_1/ip/clk_wiz_0/clk_wiz_0_stub.v | 8 +- .../ip/clk_wiz_0/clk_wiz_0_stub.vhdl | 8 +- .../ip/clk_wiz_0/clk_wiz_0_stub.v | 27 ++ .../ip/clk_wiz_0/clk_wiz_0_stub.vhdl | 35 +++ .../sources_1/new/top.v | 20 +- .../RISC-V-Scaffold-Basys3.xpr | 245 ++++++++++++++++-- programs/hello.c | 16 -- 10 files changed, 320 insertions(+), 71 deletions(-) create mode 100644 RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.ip_user_files/ip/clk_wiz_0/clk_wiz_0_stub.v create mode 100644 RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.ip_user_files/ip/clk_wiz_0/clk_wiz_0_stub.vhdl diff --git a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0.xml b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0.xml index 8ed3b55..b0b1f7c 100644 --- a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0.xml +++ b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0.xml @@ -1411,11 +1411,11 @@ GENtimestamp - Sun Apr 05 17:27:05 UTC 2026 + Sun Jun 14 19:05:51 UTC 2026 outputProductCRC - 9:4527b5ca + 9:067c9c1a diff --git a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_sim_netlist.v b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_sim_netlist.v index 3dd5440..ea110f8 100644 --- a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_sim_netlist.v +++ b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_sim_netlist.v @@ -2,10 +2,10 @@ // Copyright 2022-2025 Advanced Micro Devices, Inc. All Rights Reserved. // -------------------------------------------------------------------------------- // Tool Version: Vivado v.2025.2 (lin64) Build 6299465 Fri Nov 14 12:34:56 MST 2025 -// Date : Sun Apr 5 13:21:14 2026 -// Host : arya running 64-bit EndeavourOS Linux -// Command : write_verilog -force -mode funcsim -rename_top clk_wiz_0 -prefix -// clk_wiz_0_ clk_wiz_0_sim_netlist.v +// Date : Sun Jun 14 15:05:51 2026 +// Host : laptop running 64-bit Arch Linux +// Command : write_verilog -force -mode funcsim +// /home/liamh/RISC-V/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_sim_netlist.v // Design : clk_wiz_0 // Purpose : This verilog netlist is a functional simulation representation of the design and should not be modified // or synthesized. This netlist cannot be used for SDF annotated simulation. @@ -32,7 +32,7 @@ module clk_wiz_0 wire locked; wire reset; - clk_wiz_0_clk_wiz_0_clk_wiz inst + clk_wiz_0_clk_wiz inst (.clk_in1(clk_in1), .clk_out1(clk_out1), .clk_out2(clk_out2), @@ -40,7 +40,7 @@ module clk_wiz_0 .reset(reset)); endmodule -module clk_wiz_0_clk_wiz_0_clk_wiz +module clk_wiz_0_clk_wiz (clk_out1, clk_out2, reset, diff --git a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_sim_netlist.vhdl b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_sim_netlist.vhdl index ac9abb0..d2bb696 100644 --- a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_sim_netlist.vhdl +++ b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_sim_netlist.vhdl @@ -2,10 +2,10 @@ -- Copyright 2022-2025 Advanced Micro Devices, Inc. All Rights Reserved. -- -------------------------------------------------------------------------------- -- Tool Version: Vivado v.2025.2 (lin64) Build 6299465 Fri Nov 14 12:34:56 MST 2025 --- Date : Sun Apr 5 13:21:14 2026 --- Host : arya running 64-bit EndeavourOS Linux --- Command : write_vhdl -force -mode funcsim -rename_top clk_wiz_0 -prefix --- clk_wiz_0_ clk_wiz_0_sim_netlist.vhdl +-- Date : Sun Jun 14 15:05:51 2026 +-- Host : laptop running 64-bit Arch Linux +-- Command : write_vhdl -force -mode funcsim +-- /home/liamh/RISC-V/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_sim_netlist.vhdl -- Design : clk_wiz_0 -- Purpose : This VHDL netlist is a functional simulation representation of the design and should not be modified or -- synthesized. This netlist cannot be used for SDF annotated simulation. @@ -15,7 +15,7 @@ library IEEE; use IEEE.STD_LOGIC_1164.ALL; library UNISIM; use UNISIM.VCOMPONENTS.ALL; -entity clk_wiz_0_clk_wiz_0_clk_wiz is +entity clk_wiz_0_clk_wiz is port ( clk_out1 : out STD_LOGIC; clk_out2 : out STD_LOGIC; @@ -23,9 +23,9 @@ entity clk_wiz_0_clk_wiz_0_clk_wiz is locked : out STD_LOGIC; clk_in1 : in STD_LOGIC ); -end clk_wiz_0_clk_wiz_0_clk_wiz; +end clk_wiz_0_clk_wiz; -architecture STRUCTURE of clk_wiz_0_clk_wiz_0_clk_wiz is +architecture STRUCTURE of clk_wiz_0_clk_wiz is signal clk_in1_clk_wiz_0 : STD_LOGIC; signal clk_out1_clk_wiz_0 : STD_LOGIC; signal clk_out2_clk_wiz_0 : STD_LOGIC; @@ -187,7 +187,7 @@ end clk_wiz_0; architecture STRUCTURE of clk_wiz_0 is begin -inst: entity work.clk_wiz_0_clk_wiz_0_clk_wiz +inst: entity work.clk_wiz_0_clk_wiz port map ( clk_in1 => clk_in1, clk_out1 => clk_out1, diff --git a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_stub.v b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_stub.v index 22daff1..079c783 100644 --- a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_stub.v +++ b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_stub.v @@ -2,10 +2,10 @@ // Copyright 2022-2025 Advanced Micro Devices, Inc. All Rights Reserved. // -------------------------------------------------------------------------------- // Tool Version: Vivado v.2025.2 (lin64) Build 6299465 Fri Nov 14 12:34:56 MST 2025 -// Date : Sun Apr 5 13:21:14 2026 -// Host : arya running 64-bit EndeavourOS Linux -// Command : write_verilog -force -mode synth_stub -rename_top clk_wiz_0 -prefix -// clk_wiz_0_ clk_wiz_0_stub.v +// Date : Sun Jun 14 15:05:51 2026 +// Host : laptop running 64-bit Arch Linux +// Command : write_verilog -force -mode synth_stub +// /home/liamh/RISC-V/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_stub.v // Design : clk_wiz_0 // Purpose : Stub declaration of top-level module interface // Device : xc7a35tcpg236-1 diff --git a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_stub.vhdl b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_stub.vhdl index de31cff..504478e 100644 --- a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_stub.vhdl +++ b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_stub.vhdl @@ -2,10 +2,10 @@ -- Copyright 2022-2025 Advanced Micro Devices, Inc. All Rights Reserved. -- -------------------------------------------------------------------------------- -- Tool Version: Vivado v.2025.2 (lin64) Build 6299465 Fri Nov 14 12:34:56 MST 2025 --- Date : Sun Apr 5 13:21:14 2026 --- Host : arya running 64-bit EndeavourOS Linux --- Command : write_vhdl -force -mode synth_stub -rename_top clk_wiz_0 -prefix --- clk_wiz_0_ clk_wiz_0_stub.vhdl +-- Date : Sun Jun 14 15:05:51 2026 +-- Host : laptop running 64-bit Arch Linux +-- Command : write_vhdl -force -mode synth_stub +-- /home/liamh/RISC-V/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_stub.vhdl -- Design : clk_wiz_0 -- Purpose : Stub declaration of top-level module interface -- Device : xc7a35tcpg236-1 diff --git a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.ip_user_files/ip/clk_wiz_0/clk_wiz_0_stub.v b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.ip_user_files/ip/clk_wiz_0/clk_wiz_0_stub.v new file mode 100644 index 0000000..079c783 --- /dev/null +++ b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.ip_user_files/ip/clk_wiz_0/clk_wiz_0_stub.v @@ -0,0 +1,27 @@ +// Copyright 1986-2022 Xilinx, Inc. All Rights Reserved. +// Copyright 2022-2025 Advanced Micro Devices, Inc. All Rights Reserved. +// -------------------------------------------------------------------------------- +// Tool Version: Vivado v.2025.2 (lin64) Build 6299465 Fri Nov 14 12:34:56 MST 2025 +// Date : Sun Jun 14 15:05:51 2026 +// Host : laptop running 64-bit Arch Linux +// Command : write_verilog -force -mode synth_stub +// /home/liamh/RISC-V/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_stub.v +// Design : clk_wiz_0 +// Purpose : Stub declaration of top-level module interface +// Device : xc7a35tcpg236-1 +// -------------------------------------------------------------------------------- + +// This empty module with port declaration file causes synthesis tools to infer a black box for IP. +// The synthesis directives are for Synopsys Synplify support to prevent IO buffer insertion. +// Please paste the declaration into a Verilog source file or add the file as an additional source. +(* CORE_GENERATION_INFO = "clk_wiz_0,clk_wiz_v6_0_17_0_0,{component_name=clk_wiz_0,use_phase_alignment=true,use_min_o_jitter=false,use_max_i_jitter=false,use_dyn_phase_shift=false,use_inclk_switchover=false,use_dyn_reconfig=false,enable_axi=0,feedback_source=FDBK_AUTO,PRIMITIVE=MMCM,num_out_clk=2,clkin1_period=10.000,clkin2_period=10.000,use_power_down=false,use_reset=true,use_locked=true,use_inclk_stopped=false,feedback_type=SINGLE,CLOCK_MGR_TYPE=NA,manual_override=false}" *) +module clk_wiz_0(clk_out1, clk_out2, reset, locked, clk_in1) +/* synthesis syn_black_box black_box_pad_pin="reset,locked,clk_in1" */ +/* synthesis syn_force_seq_prim="clk_out1" */ +/* synthesis syn_force_seq_prim="clk_out2" */; + output clk_out1 /* synthesis syn_isclock = 1 */; + output clk_out2 /* synthesis syn_isclock = 1 */; + input reset; + output locked; + input clk_in1; +endmodule diff --git a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.ip_user_files/ip/clk_wiz_0/clk_wiz_0_stub.vhdl b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.ip_user_files/ip/clk_wiz_0/clk_wiz_0_stub.vhdl new file mode 100644 index 0000000..504478e --- /dev/null +++ b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.ip_user_files/ip/clk_wiz_0/clk_wiz_0_stub.vhdl @@ -0,0 +1,35 @@ +-- Copyright 1986-2022 Xilinx, Inc. All Rights Reserved. +-- Copyright 2022-2025 Advanced Micro Devices, Inc. All Rights Reserved. +-- -------------------------------------------------------------------------------- +-- Tool Version: Vivado v.2025.2 (lin64) Build 6299465 Fri Nov 14 12:34:56 MST 2025 +-- Date : Sun Jun 14 15:05:51 2026 +-- Host : laptop running 64-bit Arch Linux +-- Command : write_vhdl -force -mode synth_stub +-- /home/liamh/RISC-V/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.gen/sources_1/ip/clk_wiz_0/clk_wiz_0_stub.vhdl +-- Design : clk_wiz_0 +-- Purpose : Stub declaration of top-level module interface +-- Device : xc7a35tcpg236-1 +-- -------------------------------------------------------------------------------- +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; + +entity clk_wiz_0 is + Port ( + clk_out1 : out STD_LOGIC; + clk_out2 : out STD_LOGIC; + reset : in STD_LOGIC; + locked : out STD_LOGIC; + clk_in1 : in STD_LOGIC + ); + + attribute CORE_GENERATION_INFO : string; + attribute CORE_GENERATION_INFO of clk_wiz_0 : entity is "clk_wiz_0,clk_wiz_v6_0_17_0_0,{component_name=clk_wiz_0,use_phase_alignment=true,use_min_o_jitter=false,use_max_i_jitter=false,use_dyn_phase_shift=false,use_inclk_switchover=false,use_dyn_reconfig=false,enable_axi=0,feedback_source=FDBK_AUTO,PRIMITIVE=MMCM,num_out_clk=2,clkin1_period=10.000,clkin2_period=10.000,use_power_down=false,use_reset=true,use_locked=true,use_inclk_stopped=false,feedback_type=SINGLE,CLOCK_MGR_TYPE=NA,manual_override=false}"; +end clk_wiz_0; + +architecture stub of clk_wiz_0 is + attribute syn_black_box : boolean; + attribute black_box_pad_pin : string; + attribute syn_black_box of stub : architecture is true; + attribute black_box_pad_pin of stub : architecture is "clk_out1,clk_out2,reset,locked,clk_in1"; +begin +end; diff --git a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.srcs/sources_1/new/top.v b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.srcs/sources_1/new/top.v index 58bc133..846103d 100644 --- a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.srcs/sources_1/new/top.v +++ b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.srcs/sources_1/new/top.v @@ -70,18 +70,18 @@ module Top( .clock (cpu_clk), .reset (reset), .io_execute (execute), - .io_debug_write (debug_write), - .io_debug_write_address (debug_write_address), - .io_debug_write_data (debug_write_data), - .io_debug_1 (debug_1), - .io_debug_2 (debug_2), - .io_hsync (vgaHSync), - .io_vsync (vgaVSync), + .io_flash (debug_write), + .io_flash_address (debug_write_address), + .io_flash_value (debug_write_data), +// .io_debug_1 (debug_1), +// .io_debug_2 (debug_2), + .io_hsync (vga_hsync_int), + .io_vsync (vga_vsync_int), .io_rgb (rgb), .io_blanking (blanking), - .io_vga_clk (clk_25), - .io_btns(btns) - + .io_vga_clk (clk_25), + .io_btns (btns) +// .io_tx (RsTx) ); assign vgaRed = blanking ? 4'h0 : rgb[11:8]; diff --git a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.xpr b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.xpr index b6531a3..10d7cff 100644 --- a/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.xpr +++ b/RISC-V-Scaffold-Basys3/RISC-V-Scaffold-Basys3.xpr @@ -4,7 +4,7 @@ - +