#include <avr/io.h>
#include <avr/interrupt.h>
ISR(PCINT2_vect) {
  //inputs are active low
  uint8_t pd = ~PIND;
  if (pd & 0x80)//we need to determine which pin generated interrupt
    PORTB |= 1 << PB1;
  else if (pd & 0x40)
    PORTB &= ~(1 << PB1);
}

void setup()
{
  DDRD &= ~((1 << PD7) |  (1 << PD6)) ;//port D as input
  PORTD = (1 << PD7) | (1 << PD6);//use pull up resistors PORTD6 and 7
  DDRB= 1 << PB1;//output port bit
  // Enable pin change interrupts
  PCICR = 1 << PCIE2;//enable pin change interrupt bank 2
  PCMSK2 = (1 << PCINT22) | (1 << PCINT23);//enable pin change interrupt on PCINT22 PCINT23
  sei();// Set global interrupt flag
}

int main()
{
  init();
  setup();
  while(true);
}