spacepaste

#include <avr/io.h>
#include <avr/interrupt.h>
void timer_init(void) {
// wafeform generation mode bit, see page160
// CTC Mode, TOP=OCR2A
TCCR2A |= (1<<WGM21);
// top value
OCR2A = 15625;
// set OC2A on compare match - from original code...useless?
TCCR2A |= (1<<COM2A0) | (1<<COM2A1);
// prescalar: 1024
TCCR2B |= (1<<CS22) | (1<<CS21) | (1<<CS20);
// if timer2 reaches the value in OCR2A, fire interrupt
TIMSK2 |= (1<<OCIE2A);
}
#define LED1 PB0
ISR(TIMER2_COMPA_vect) {
PORTB ^= (1 << LED1); // toggle LED1
}
int main (void) {
timer_init();
sei();
for (;;) {
}
}