//----------------------
extern "C" {
  void init_ADC();
  void ADC_ISR();
}
//---------------------------------------------

void setup() {
  // put your setup code here, to run once:
  DDRB |= 0b00111111;
  DDRD |= 0b11110000;
  init_ADC();
}

ISR(ADC_vect) {
  ADC_ISR();
}

void loop() {
  // put your main code here, to run repeatedly:
  // for (int8_t MSB = 0; MSB < 0b01000000; MSB++) {
  //   for (int16_t LSB = 0; LSB < 0x0100; LSB += 0b00010000) {
  //     PORTB = PORTB & 0b11000000 | MSB;
  //     PORTD = PORTD & 0b00001111 | LSB;
  //     delay(50);
  //   }
  // }
}