#define F_CPU 7372800UL

#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>

static uint8_t br[10] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f};
static uint8_t sec, msec;
static uint8_t seg[4] = {_BV(4), _BV(5), _BV(6), _BV(7)};

static uint8_t state = 0x00;

ISR(TIMER1_COMPA_vect)
{
	state ^= 0x80;
}

ISR(TIMER0_COMP_vect)
{
	//za brojeve
	msec++;
	if(msec == 100)
	{
		msec = 0;
		sec++;

		if(sec == 60)
		{
			sec = 0;
		}
	}
}

int main(void)
{
	DDRA = 0xff;
	PORTA = 0xff;
	DDRB = 0xf0;

	sec = 0;
	msec = 0;

	//timer 1

	TCCR1B = _BV(WGM12) | _BV(CS12);

	OCR1A = 14399; //za tockicu,imamo formulu s ctcom s 2 zato sto je pola sekunde upaljena,pola ugasena

	//timer 0

	TCCR0 = _BV(WGM01) | _BV(CS02) | _BV(CS00);

	OCR0 = 71; //bez 2 jer se racuna vrijeme i nema blinkanja nikakvog

	TIMSK = _BV(OCIE1A) | _BV(OCIE0);

	sei();


	while (1)
	{
		PORTB = seg[0];
		PORTA = br[sec/10];
		_delay_ms(1);

		PORTB = seg[1];
		PORTA = br[sec%10];
		PORTA ^= state;
		_delay_ms(1);

		PORTB = seg[2];
		PORTA = br[msec/10];
		_delay_ms(1);

		PORTB = seg[3];
		PORTA = br[msec%10];
		_delay_ms(1);
	}
}