mcp 3462 with Arduino Zero definition-question not issue!

[beyondblood]

Not really an issue, more of a question so apologies...

I'm attempting to read from channel 0 in mux mode but having issues even entering the setup and loop sections. I'm assuming it's something to do with my mcp definition since I've tested the println function and it seems to work. I'm using an Arduino Zero which is SAMD21. I added a lot of print statements to try and figure out where the program is/isn't making it to. If I go by these statements, the setup and loop aren't being read. Assuming that I've done something really dumb since I'm quite new to this.

MCP3462 mcp(10); //the problem?

void setup() {
Serial.begin(115200);
while (!Serial)
;
Serial.println(FILE);
if (!mcp.begin()) {
Serial.println("failed to initialize MCP");
while (1)
;
}
}

// the loop routine runs over and over again forever:
void loop() {
// read the input on default analog channel:
int32_t adcdata = mcp.analogRead(MCP_CH0);

// Convert the analog reading
double voltage = adcdata * mcp.getReference() / mcp.getMaxValue();
Serial.println("converted voltage");

// print out the value you read:
Serial.println("voltage: ");
Serial.print(voltage, 10);
Serial.println("printed voltage");

// pause program for one second
delay(1000);
}

[nerdyscout]

do you use a pullup resistor at pin /IRQ ?

[beyondblood]

Yes, I've got a pullup at IRQ going to 3.3V. I was thinking maybe my problem was with settings as I have the master clock floating as I wanted to use the internal clock. Attached is pic of my hardware config. Thanks again!

[nerdyscout]

he pull-up value can be equal to 100-200k for a weak pull-up using the typical clock frequency datasheet, page 31

beside that I am relatively sure your problem is because of my code... sorry. which exact commit are you on?

does your code still freeze if you remove int32_t adcdata = mcp.analogRead(MCP_CH0); ??

if so: there is a while loop inside which is not working, I have seen other people fail here

    while (!_status.dr) {
      _status = read(&adcdata);
    }

please read #5 (comment) there this issue was already discussed.

[beyondblood]

Hi and thanks for responding! I've changed out my resistor for a 100k, so thank you for that catch. When I comment out int32_t adcdata = mcp.analogRead(MCP_CH0); the loop starts printing/working again, which is strange. I'm new to all this so I've downloaded the files from the 'examples' section and the main files, not sure which commit. I'm thinking it's something to do with my definition MCP3462 mcp(10);

[nerdyscout]

as just proven the definition of mcp() is fine, problem is the readAnalog() function.
I am sorry but I can not give any further support.

[beyondblood]

no worries! Thank you for your time!

[KrisKasprzak]

@beyondblood did you ever get this chip to work? I having issues as well..