MKRZERO D2 and D3 attachinterrupts

[tjohnny88]

I can't seem to get interrupts to work on D2 (PA10) and D3 (PA11) using:



attachInterrupt(digitalPinToInterrupt(2), count, CHANGE);



Are these 2 pins not interrupt compatible in Arduino?

THanks

[pert]

As stated in the attachInterrupt() documentation, the pins you can use with this function are:
https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/

MKR Family boards  0, 1, 4, 5, 6, 7, 8, 9, A1, A2

[tjohnny88]

Yes but pins 2,3 seem to have interrupts based on the chips datasheet.  I'm stuck using those 2 pins and trying to make it work.

[pert]

There are different types of interrupt capabilities of pins. For example, although only pins 2 and 3 of the Arduino Uno have the external interrupt capability required by attachInterrupt(), all the Uno's IO pins have pin change interrupt capability. You are welcome to use the interrupt functionality of pins 2 and 3 on your MKR Zero. You just can't use them with attachInterrupt().

[tjohnny88]

Do you have any idea on how to do that?


That is where I'm stuck

[Juraj]

Do you have any idea on how to do that?


That is where I'm stuck

Why can't you use one of the pins available for attachInterrupt?

this is interrupt setup for pin 5. for 2 it is not enough to change the number

Code: [Select]


  REG_GCLK_CLKCTRL = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID (GCM_EIC)) ;
  while ( GCLK->STATUS.bit.SYNCBUSY == 1 );

  EIC->CTRL.bit.ENABLE = 1;
  while (EIC->STATUS.bit.SYNCBUSY == 1);

  const PinDescription& interruptPinDesc = g_APinDescription[5];

  PORT->Group[interruptPinDesc.ulPort].PINCFG[interruptPinDesc.ulPin].bit.PMUXEN = 1;
  PORT->Group[interruptPinDesc.ulPort].PMUX[interruptPinDesc.ulPin >> 1].reg |= PORT_PMUX_PMUXO_A;

  EIC->CONFIG[1].reg |= EIC_CONFIG_SENSE0_FALL_Val << ((interruptPinDesc.ulExtInt - 8) << 2);
  EIC->EVCTRL.reg |= 1<<interruptPinDesc.ulExtInt;
  EIC->INTENSET.reg = EIC_INTENSET_EXTINT(1<<interruptPinDesc.ulExtInt);
  NVIC_EnableIRQ(EIC_IRQn);


[tjohnny88]

Why can't you use one of the pins available for attachInterrupt?

The custom hardware has already been made. Trying to fix this with software

[Juraj]

The custom hardware has already been made. Trying to fix this with software

then create a custom hardware definition where you enable interrupt on pin 2.
it is simple.
start with https://github.com/jandrassy/my_boards
then modify variant.cpp