/*
 * Sequencer.c
 *
 * Created: 26.09.2017 13:18:08
 * Author : Miłosz
 */

#define F_CPU 1000000UL
#define sei()

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


//wyjscia
#define bit1 PD0
#define bit2 PD1
#define bit3 PD2
#define bit4 PD3

void main(void)
{
//  rezystor podciągający do Vcc
    PORTB = 0xff;
    PORTC = 0xff;
    PORTD = 0xf0;

//  wyjścia
    DDRD |= (1<<bit1) | (1<<bit2) | (1<<bit3) | (1<<bit4);


    TCCR0 |= (1<<CS02) | (1<<CS00);
    TIMSK |= (1<<TOIE0);
    TCNT0=0;

    PORTD |= (1<<bit1);

}


sei();

        ISR(TIMER0_OVF_vect)
        {
            PORTD ^= (1<<bit1);
            PORTD ^= (1<<bit2);
        }