8.3 - 7seg štoperica - start/stop

#define F_CPU 7372800UL

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

#include "lcd.h"

uint8_t i;
uint8_t values[10] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f};
uint8_t data[4] = {0, 0, 0, 0};
uint16_t stotinka = 0;
uint16_t counter2 = 0;
uint8_t dotOn = 0;
uint8_t state = 0;

void time2data(uint16_t time, uint8_t data[])
{
	for(i=0; i<4; i++)
	{
		data[3-i] = time%10;
		time = time / 10;
	}
}

ISR(TIMER1_COMPA_vect)
{
		if(state == 0)
		{
			counter2++;
			if(stotinka == 10000)
			{
				stotinka = 0;
			}
			else
			{
				stotinka++;
			}
			if(counter2 % 50 == 0)
			{
				if(dotOn == 0)
				{
					dotOn = 1;
				}
				else
				{
					dotOn = 0;
				}
			}
			time2data(stotinka, data);
	}
}

int main(void)
{
	DDRA = 0xff;
	DDRB = 0xf0;
	PORTB = 0x0f;

	TCCR1B = _BV(WGM12) | _BV(CS11);
	OCR1A = 9215;

	TIMSK = _BV(OCIE1A);
	sei();


	while (1)
	{
		if(bit_is_clear(PINB, 0))
		{
			if(state == 0)
			{
				state = 1;
			}
			else
			{
				state = 0;
			}
		}

		if(bit_is_clear(PINB, 1))
		{
			stotinka = 0;
			for(i=0; i<4; i++)
			{
				data[i] = 0;
			}
		}

		for(i=0; i<4; i++)
		{
			PORTA = values[data[i]];
			if(dotOn == 1 && i == 1)
			{
				PORTA |= _BV(7);
			}
			PORTB &= 0x0f;
			PORTB |= _BV(4+i);
			_delay_ms(1);
		}
	}
}