#define ds 15
#define latch 2
#define shift 4

// const int ds = 15;
// const int latch = 2;
// const int shift = 4;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(ds, OUTPUT);
  pinMode(latch, OUTPUT);
  pinMode(shift, OUTPUT);
}

// int pattern = 0b1010101001010101;
// int pattern = 0xf000;

void loop() {
   for (int i = 1; i <= 32768; i = i * 2) {
    digitalWrite(latch, LOW);
    shiftOut(ds, shift, LSBFIRST, i >> 8);
    shiftOut(ds, shift, LSBFIRST, i);
    digitalWrite(latch, HIGH);
    delay(50);
  }
  for (int i = 16384; i >= 2; i = i / 2) {
    digitalWrite(latch, LOW);
    shiftOut(ds, shift, LSBFIRST, i >> 8);
    shiftOut(ds, shift, LSBFIRST, i);
    digitalWrite(latch, HIGH);
    delay(50);
  }

  // digitalWrite(latch, LOW);
  // shiftOut(ds, shift, MSBFIRST, pattern);
  // digitalWrite(latch, HIGH);
  // delay(1000);
  // pattern = ~pattern; // Invert the pattern

  // put your main code here, to run repeatedly:
  // delay(10); // this speeds up the simulation
}