over current in Y_ENDSTOP port

[sangjoo]

define Y_MIN_PIN 20 in pins.h

is same PB0_SS_PCINT0 in Teensy2.0++ (A90USB1286)

I think the PB0_SS_PCINT0 port is crashed intenally.

I found this pin has over current arround 80mA When this pin make to Ground .
So A90USB1286 was over heated.

[kliment]

On 08/05/2012 09:52 AM, sangjoo wrote:

#define Y_MIN_PIN 20 in pins.h
is same PB0_SS_PCINT0 in Teensy2.0++ (A90USB1286)

I think the PB0_SS_PCINT0 port is crashed intenally.

I found this pin has over current arround 80mA When this pin make to Ground .
So A90USB1286 was over heated.

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Reply to this email directly or view it on GitHub:
#201
I don't understand what the problem is. The endstop pins are pulled high
by the chip, with a weak pullup (many kOhms). When connected to ground,
much less current should flow. Only thing I can think of is hardware
damage to the chip. Do you have another idea?

[kliment]

On 08/05/2012 10:57 AM, sangjoo wrote:

this is not normal condition. one pin's current is
current arround 80mA

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Reply to this email directly or view it on GitHub:
#201 (comment)
Unless something is explicitly setting it high, you have a hardware
problem. I don't see what it has to do with Sprinter.

[sangjoo]

This is not normal condition.
need to compare with other X_ENDSTOP and Z_ENDSTOP. These pins only current 0.15mA.
I think Y_ENDSTOP pin was not only input mode. somewhere in code it's pin set to high-level with ouptut.

[kliment]

On 08/05/2012 11:15 AM, sangjoo wrote:

This is not normal condition.
need to compare with other X_ENDSTOP and Z_ENDSTOP. These pins only current 0.15mA.
I think Y_ENDSTOP pin was not only input mode. somewhere in code it's pin set to high-level with ouptut.

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Reply to this email directly or view it on GitHub:
#201 (comment)
Now I understand what you mean. So you are saying the Y min endstop is
the same as the SS pin? That would cause this behaviour as the SS pin is
set high if SD support is enabled. But it would also make the SD card
not work at all if an endstop is connected. Maybe it's an error in the
pin definitions? Is there any other pin that is defined as 20 in the pindef?

[sangjoo]

Could I know full name of the SS pin?
what's mean the SS pin?

In belows, y_stop pin is not used in microSD.
I think
SDCS : chip select
SDCD : card detect

in your comment, SS pin is set high if SD support is enabled.
So, I think SS pin is same as SDCS pin.
But need to test with active level.

pindef -- AT90USB1286 -- microSD
20, pb0 y_stop
21, pb1 sclk, SDCLK
22, pb2 mosi, SDDI
23, pb3 miso, SDDO
24, pb4
25, pb5
26, pb6 sdcs, SDCSH
27, pb7 sdcd, SDCD

for your information.
http://reprap.org/mediawiki/images/d/d5/Printrboard_RevB_Schematic150.png
http://reprap.org/wiki/File:Printrboard_RevB_Schematic150.png