Ps2keyboard library not working on Arduino Zero

[tinkerBOY-git]

Library doe not work with Arduino Zero. Is there a workaround?

[no1so]

@tinkerBOY-git I am having the same problem trying to get this library working with a SAMD based board. Not a Arduino Zero but a Adafruit Feather M0 which uses the same board as the Zero.

Did you ever find anything out regarding this?

[tinkerBOY-git]

No, sorry.

[MatthewBregg]

I'm using an M0, and got the library working.

The key was

PS2Keyboard/PS2Keyboard.cpp

Line 707 in 13026d3

attachInterrupt(irq_num, ps2interrupt, FALLING);

, as the M0 doesn't technically have all interrupt pins, (22 isn't), the earlier check

PS2Keyboard/PS2Keyboard.cpp

Line 576 in 13026d3

#ifdef CORE_INT_EVERY_PIN

isn't defined, and the IRQ_NUM remains 255, so the interrupt is never attached.

For a quick hack, just remove the preprocessor directive at

PS2Keyboard/PS2Keyboard.cpp

Line 576 in 13026d3

#ifdef CORE_INT_EVERY_PIN

and set irq_num = irq_pin unconditionally.

One suggestion: Could begin return a simple error code/bool indicating if the irq_num ever got set? Would make this a lot easier to debug and notice!

[DavyVos]

@MatthewBregg thanks for your answer, I encountered the same problem using a stm32 nucleo 64 f303re board.
The issue indeed seems to be that irq_num is never set.