#include <avr/io.h>
#include "mystd.h"
#include "utils.h"

#define D1		   PORTB0
#define D2		   PORTB1
#define D3		   PORTB2
#define D4		   PORTB4

#define PRESCALER  256
#define TIMER_FREQ (F_CPU / PRESCALER)

#define DUTY_CYCLE 1

// the PWM is something that counts from 0 to TOP
// when it reached the value i'll name TOGGLE, it'll set the OUTPUT high
// when it reaches TOP it'll reset COUNTER and set OUTPUT to low
//
// this means we have a clock that reaches TOP every X
// and during this, we can set TOGGLE such that we set OUTPUT high
void timer1_init(void) {
	// Set PB1 (OC1A) as output
	DDRB   |= _BV(PB1);

	// Non-inverting OC1B -> the OC1B is set to low on TOP reached
	TCCR1A |= _BV(COM1A1);

	// set to PWM-fast with ICR1 as TOP
	TCCR1A |= _BV(WGM11);
	TCCR1B |= _BV(WGM13) | _BV(WGM12);

	// TOP => 1hz
	ICR1	= TIMER_FREQ - 1;
	// TOGGLE => 1/10th of ICR1
	OCR1A	= ((TIMER_FREQ / 10) * DUTY_CYCLE);

	// Start timer with prescaler 256 (CS12)
	TCCR1B |= _BV(CS12);
}

int main(void) {
	timer1_init();
	while (1)
		;
}