Support pin change interrupts once they're supported in the Arduino AVR core.

[damellis]

Support pin change interrupts once they're supported in the Arduino AVR core.

[damellis]

Access to the pin change interrupts is something that should be added to the Arduino core: https://github.com/arduino/Arduino/issues/248. We'd then pick it up for the ATtiny.

[Schtrudel]

What do you mean by "should be added to the Arduino core"? It's part of the Arduino API, isn't it? (At least, it's working for mine :-) )

[NicoHood]

Are you talking about pin interrupts or pin change interrupts?

[eried]

Hey Schtrudel, what it is working? I cant attach interrupts on my tiny85 :/

[Schtrudel]

Hi eried.

I love these discussions with 3 messages in 3 years... :-) Reminds me of this joke: http://jokesareawesome.com/joke/869

Anyway, I don't remember how I solved it then, but later, I switched to another approach: I don't use attachInterrupt at all and use a few lines with the "native" mechanism. In my case, it detects the change on any of 2 buttons, and I detect which one in the ISR. Quick and dirty, but works very well for my use. Most of it shamelessly copied and adapted from https://bigdanzblog.wordpress.com/2014/08/10/attiny85-wake-from-sleep-on-pin-state-change-code-example/ [Thanks Big Dan]
For reference, the relevant parts of the code. I hope it can help.
////////////////////////////////////////////////////////////////////////////////////////////

#include <avr/sleep.h>
#include <avr/wdt.h>

#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif
#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif

const int button1 = 4;    
const int button2 = 3;
//...

volatile byte button2Pressed = 0;     // Don't forget to declare your global handled in ISR as volatile

ISR(PCINT0_vect) {
    if (digitalRead(button2))
      button2Pressed = 1;        
}


void setup()
{
//...
  pinMode(button1, INPUT_PULLUP);
  pinMode(button2, INPUT_PULLUP);
//...
}

void loop(){
     //...
     sleep();
     if (button2Pressed) {
       run_fun2();
     }
     else{
      run_fun1();
     }
    //...
}


void sleep() {
    GIMSK |= _BV(PCIE);                     // Enable Pin Change Interrupts
    PCMSK |= _BV(button1);                   // Use button1 as interrupt pin
    PCMSK |= _BV(button2);                  // Use button2 as interrupt pin

    ADCSRA &= ~_BV(ADEN);                   // ADC off
    set_sleep_mode(SLEEP_MODE_PWR_DOWN);    // replaces above statement

    sleep_enable();                         // Sets the Sleep Enable bit in the MCUCR Register (SE BIT)
    sei();                                  // Enable interrupts
    sleep_cpu();                            // sleep

    cli();                                  // Disable interrupts
   PCMSK &= ~_BV(button1);
   PCMSK &= ~_BV(button2);
    sleep_disable();                        // Clear SE bit
    ADCSRA |= _BV(ADEN);                    // ADC on

    sei();                                  // Enable interrupts
} // sleep

[eried]

Hahaha! I was thinking to reply in 1 more year but I am going to forget to do that, so thanks for the code! I´ll use it that way too, it was 3 am and I was very frustrated led debugging the tiny85