/*
 * 1284p test.c
 *
 * Created: 16.02.2022 17:51:14
 * Author : David
 */ 
#define F_CPU 128000L
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>

char help;
char last;
char sekunden;
char minuten;
char stunden;
void updateTime(){
	if(sekunden==59){
		sekunden=0;
		if(minuten==59){
			stunden=(stunden+1)%24;
			minuten=0;
		}
		else{
			++minuten;
		}
	}
	else{
		++sekunden;
	}
}
int main(void)
{
	MCUCR |= 0x80;
	MCUCR |= 0x80;
    DDRA =0xFF;
	DDRC =0xFF;
	DDRD =0xFF;
	TCCR0B =  (1<<CS01); 
	TIMSK0 |= (1<<TOIE0);
	sei();
	
	while(1){
		PORTD=sekunden;
		PORTA=stunden;
		PORTC=minuten;
		
	}
}
ISR( TIMER0_OVF_vect ) {
	help++;
	if(help==62&&last==1){
		updateTime();
		help=0;
		last=0;
	}
	if(help==63&&last==0){
		updateTime();
		help=0;
		last=1;
	}
}