#define number_of_74hc595s 4
#define numOfRegisterPins (number_of_74hc595s * 8)

//#define dataPin 16
//#define latchPin 2
//#define clockPin 4

#define dataPin 4
#define latchPin 6
#define clockPin 5

bool DirectionState = true; // MSBFIRST

void updateShiftRegister(uint32_t leds, bool isMSBFIRST = true) {
  byte b0 = leds & 0xFF;
  byte b1 = (leds >> 8) & 0xFF;
  byte b2 = (leds >> 16) & 0xFF;
  byte b3 = (leds >> 24) & 0xFF;

  digitalWrite(latchPin, LOW);

  if (isMSBFIRST) {
    shiftOut(dataPin, clockPin, MSBFIRST, b3);
    shiftOut(dataPin, clockPin, MSBFIRST, b2);
    shiftOut(dataPin, clockPin, MSBFIRST, b1);
    shiftOut(dataPin, clockPin, MSBFIRST, b0);
  } else {
    shiftOut(dataPin, clockPin, LSBFIRST, b0);
    shiftOut(dataPin, clockPin, LSBFIRST, b1);
    shiftOut(dataPin, clockPin, LSBFIRST, b2);
    shiftOut(dataPin, clockPin, LSBFIRST, b3);
  }

  digitalWrite(latchPin, HIGH);
}

void setup() {
  Serial.begin(115200);
  Serial.println(F("Initialize System"));
  pinMode(dataPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
}

void loop() {
  for (int i = 0; i < numOfRegisterPins; i++) {
    Serial.println(i);
    uint32_t test = (1UL << i);
    updateShiftRegister(test, DirectionState);
    delay(1000); // 1 másodperc
  }
  /*uint32_t test = (1UL << 1);
  updateShiftRegister(test, DirectionState);*/
}