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

void portInit(void);

void main(){
	portInit();
	
	while(1){
		PORTA = PORTB = PORTC = PORTD = 0x00;
		_delay_ms(1000);
		PORTA = PORTB = PORTC = PORTD = 0xFF;
		_delay_ms(1000);
	}
}

void portInit(){
	DDRA = 0xff;
	DDRB = 0xff;
	DDRC = 0xff;
	DDRD = 0xff;
}