#define F_CPU 16000000UL
#define DISPLAY 4

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

unsigned char segmets[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e} ;
unsigned int io[] = {0x01, 0x02, 0x04, 0x08} ;

unsigned int num, digit, a;
unsigned char i;

int main()
{
	num = 1234;
	i= 0;
	DDRA = 0xff;
	DDRB = (1<<PA0) |(1<<PA1)|(1<<PA2)|(1<<PA3);
	while(1)
	{
		if(i <= DISPLAY)
		{
			a = num%10;
			PORTA= segmets[a];
			PORTB = io[i++];
		}
		else
		{
			i=0;
		}
	}
}