#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#define CW -1
#define CCW 1
volatile int arah =0;

ISR(INT2_vect)
{
  arah = CW;
}

ISR(INT1_vect)
{
  arah = CCW;
}

int main (void)
{
  DDRA=0xff;
  PORTA = 0x00;
  DDRB |=(1<<PB7);// LED output enable
  PORTD |=_BV(PD2); // pin PD.0 input pullup
  PORTD |=_BV(PD1); // pin PD.1 input pullup
  
  EIMSK |= (1<<INT2) | _BV(INT1); // enable interrupt
  EICRA |= _BV(ISC21)|_BV(ISC20)|_BV(ISC10)|_BV(ISC11); //rising edge activate INT0
  sei();

  while(1)
  {
      if (arah==CCW) 
      {
        for(int i=0;i<=7;i++)
        {
          PORTA = ~(1<<i);
          _delay_ms(500);
        }
      } 
      
      else if (arah==CW)
      {
        for(int i=7;i>=0;i--)
          {
            PORTA = ~(1<<i);
            _delay_ms(500);
          }
      }
			else if (arah==0)
			{
				PORTA=0xFF;
			}
}
}