#include <avr/io.h>

#include "utils.h"
#include "bitmanip.h"
#include "timer.h"

#define PERIOD						500
#define PRESCALE_VALUE				1024		// can be 1, 8, 64, 256, 1024

// led turns on and off every PERIOD ms using CTC timer
int main() {
	MODE_OUTPUT(LED2);

	TCCR1B |= (1 << WGM12);						// Table 16-4 : set timer in CTC (Clear Time on Compare) mode, use bit WGM12, located in register TCCR1B (16.11.2)

	TCCR1A |= (1 << COM1A0);					// 14.3.1 : set Compare Output with COM1A0, it toggles OC1A on compare match (Table 16-1), OC1A is alternate function for PORTB1 (Table 14-3)

	OCR1A = TIME_MS(PERIOD, PRESCALE_VALUE);	// Table 16-4 : set CTC compare value on channel A, the counter is cleared to zero when the counter value (TCNT1) matches the OCR1A register

	TCCR1B |= (PRESCALE_SET(PRESCALE_VALUE));

	while(1);
}





