#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>
void TimerInit();
unsigned char periode;
ISR (TIMER0_OVF_vect)
{
PORTB ^= (1 << PB7);
TCNT0= - 125;
}
/*
prescaller 64 , Xtal 16MHz
tick = 64/16Mhz= 4 us
delay=counter*tick
delay=counter*4us
counter=delayus/4us
untuk sampling rate 2 khz maka Tsampling= 1/2Khz= 500us
counter = 500/4us = 125
nilai TCNT1= -125 -> karena counter up
 */
int main(void) {
DDRB |= _BV(PB7);
TimerInit(); /// schedule 10ms
sei();
/// enable global interupsi
while (1) {
sleep_mode(); // sleep
}
}
void TimerInit(void) {
// TCNT0 = -125; // reset counter
TCCR0B = (1 << CS01) | (1 << CS00); //prescaller 64
TIMSK0 |= (1 << TOIE0); // enable overflow interrupt
}