// ST_CP pin 12
const int latchPin = GPIO_NUM_19;
// SH_CP pin 11
const int clockPin = GPIO_NUM_21;
// DS pin 14
const int dataPin = GPIO_NUM_18;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);


}

void shiftOut2(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val)
{
        uint8_t i;

        for (i = 0; i < 8; i++)  {
                if (bitOrder == LSBFIRST)
                        digitalWrite(dataPin, !!(val & (1 << i)));
                else    
                       digitalWrite(dataPin, !!(val & (1 << (7 - i))));
                        
               digitalWrite(clockPin, HIGH);
               delay(30);
               digitalWrite(clockPin, LOW);            
               delay(30);
               digitalWrite(latchPin, LOW);
               delay(5);
               digitalWrite(latchPin,HIGH );

       }
}


void loop() {
  for (int numberToDisplay = 0; numberToDisplay < 256; numberToDisplay++) {
 
    // ST_CP LOW to keep LEDs from changing while reading serial data
    //digitalWrite(latchPin, LOW);
 
    // Shift out the bits
    Serial.println(numberToDisplay);
    shiftOut2(dataPin, clockPin, MSBFIRST, numberToDisplay);
 
    // ST_CP HIGH change LEDs
    ///digitalWrite(latchPin, HIGH);
 
    delay(1000);
  }
}