AVR_INT.zip_Write On

#include <avr/io.h> #include <avr/interrupt.h> int toggle = 0; int main() { DDRD |= _BV(PD5); // watchdog init DDRB |= _BV(PB4) | _BV(PB5); PORTB |= _BV(PB4) | _BV(PB5); cli(); EICRA = 0x00; EICRB = _BV(ISC40)|_BV(ISC41);// INT4: rising edge EIMSK = _BV(INT4); // enable INT4 sei(); for (;;) { PORTD |= _BV(PD5); // watchdog reset PORTD &= ~_BV(PD5); // watchdog reset if (toggle == 0) { PORTB |= _BV(PB4); } else { PORTB &= ~_BV(PB4); } } return 0; } ISR(INT4_vect) { if (toggle == 0) { toggle = 1; } else { toggle = 0; } }