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

ISR(PCINT0_vect){
  PORTB|=(1<<7);
    for (unsigned char i=0;i<256;i++){
    PORTA^= i;
    PORTA=~ i;
    _delay_ms(200);
    }
  PORTB&=~(1<<7);
  }
ISR(PCINT1_vect){
  PORTB|=(1<<7);
    for (int i=255;i>=0;i--){
    PORTA^= i;
    PORTA=~ i;
    _delay_ms(200);
    }
  PORTB&=~(1<<7);
  }
int i;
int main (void){
  DDRA=0xff;
  PORTA=0x00;
  DDRB |=(1<<PB7);// LED output enable
  PORTB|=(1<<PB0); // pint PCINT1 pullup
  PORTE|=(1<<PE0); //PCINT8
  PCMSK0 |= (1<<PCINT1); // enable interrupt
  PCICR |= _BV(PCIE0);
  PCMSK1 |= (1<<PCINT8);
  PCICR |= _BV(PCIE1);
  sei();
  PORTA=0b00000000;
  while (1){
    for (int i=0;i<256;i++){
    PORTA = i;
    _delay_ms(200);
    }
  }
}