void setup() {
  DDRD = 0x20;
  DDRD &= 0x7F;
  PIND = 0b10000000;

}

void loop() {
  int buttPin = PIND & 0x80;
  if(buttPin == 128){
//    PORTD = (1 << 5) | PORTD;
    PORTD = ~(1 << 5) & PORTD;
// not 1<<5     11011111
// & portD      10100000
//              10000000
// 0 == LOW  
}
  else if(buttPin != 128){
//    PORTD = ~(1 << 5) & PORTD;
    PORTD = (1 << 5) | PORTD;
//     1<<5     00100000
// | portD      10100000
//              10100000
// 1 == HIGH
  }
}


/*int bt = 7;
int led = 5;

void setup() {
  pinMode(bt, INPUT_PULLUP);
  pinMode(led, OUTPUT);
}

void loop() {
  if(digitalRead(bt) == HIGH){
    digitalWrite(led, LOW);
}
  else{
    digitalWrite(led, HIGH);

  }
}



*/