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

uint8_t x = 0X00;
uint8_t arah;
ISR(PCINT1_vect)
{
  if (PINJ&=~(1<<0)) {
    arah = 1 ;
  }
  if (PINJ&=~(1<<1)) {
    arah = 2 ;
  }
}
int main (void)
{
  DDRA |= 0XFF;
  DDRB |= (1<<PB7);// LED output enable;
  DDRJ &= ~(1 << 0);
  DDRJ &= ~(1 << 1);
  PORTJ |= (1 << 0);
  PORTJ |= (1 << 1);
  PCMSK1 |= (1 << PCINT9) | (1 << PCINT10);
  PCICR |= _BV(PCIE1);
  sei();
  while (1) {
  PORTB|=(1<<7);
  _delay_ms(200);
  PORTB&=~(1<<7);
  _delay_ms(200);
      switch (arah) {
      case 0:
        PORTA = 0XFF;
        sei();
        break;
      case 1:
        x++;
        PORTA = x;
        _delay_ms(200);
        sei();
        break;
      case 2:
        x--;
        PORTA = x;
        _delay_ms(200);
        sei();
        break;
    }
  }
}