#include <Arduino.h>


extern uint8_t run_rgb_program;


// TCB0 general interrupt
ISR(TCB0_INT_vect)
{
    // reset the INTFLAGS - necessary on this series
    uint8_t intflags = TCB0.INTFLAGS;
    TCB0.INTFLAGS = intflags;

    // in this program, this interrupt is only used for timing.
    // we'll now return to executing loop()
}

// button interrupt
ISR(PORTA_PORT_vect)
{
    // reset the INTFLAGS - necessary on this series
    uint8_t intflags = PORTA.INTFLAGS;
    PORTA.INTFLAGS = intflags;

	// was our pin changed?
    if (intflags & PIN3_bm) {
		// is the pin low?
		if (!digitalRead(PIN_PA3)) {
			// start running a program if one isn't running already
        	if (!run_rgb_program) run_rgb_program = 1;
		} else if (run_rgb_program == 2) {
			// if we're running a program when the button is released (likely),
			// then skip this interrupt
			run_rgb_program++;
		}
    }
}