#define AIN1 60
#define AIN2 58
#define DIN 211
#define DOUT 81
#define PWM 64
#define AOUT 64
//---- GPIO ----
#define PWMPIN 25
#define DAC1 26
#define DAC2 25
#define LED 25  //!

// GPIO ESP32 ON HELTEC KIT 32

//DIGITAL OUT PINS 0 - 7 CLAB
byte Douts[] = {21,22,19,23,  18,5,17,16};
//DIGITAL IN  PINS 0 - 7 CLAB
byte Dins[]  = { 38, 39, 34, 35,  32,33,27,0}; //BUTTON = 0
//ANALOG IN PINS A - B CLAB
byte Ains[]  = {A1,A0}; //37,36
//BitValues
byte Bits[]  = {1,2,4,8,16,32,64,128};

void setup()
{ Serial.begin(9600); //Special CLAB
  for(int i= 0;i<2;i++)pinMode(Ains [i],INPUT);
  for(int i= 0;i<8;i++)pinMode(Dins [i],INPUT_PULLUP);
  for(int i= 0;i<8;i++)pinMode(Douts[i],OUTPUT);
}

void loop()
{ int i, val, inbyte; byte b;
  val = Serial.available(); //Was da?
  if (val>0)
  {inbyte=Serial.read(); //abholen
   delay(5);
   switch(inbyte)
  { case 13  : //CLAB ID nur ab Compact 1.75!
               Serial.write(3);delay(2);break; //ID
    case DIN : for(i=0,b=0;i<8;i++) //PINS to BYTE
                b+= (digitalRead(Dins[i])==HIGH?Bits[i]:0);
               Serial.write(b);break; 
    case AOUT: b=Serial.read(); //Ausgabebyte holen
               dacWrite(DAC1, b); //esp32 DAC 1  
               dacWrite(DAC2, b); //esp32 DAC 2  
               break;
  /*
    case PWM:  b=Serial.read(); //Ausgabebyte holen
               analogWrite(PWMPIN,b);
               break;
  */
    case DOUT: b=Serial.read(); //Ausgabebyte holen
               for(i=0;i<8;i++)
                digitalWrite(Douts[i],b&Bits[i]?HIGH:LOW);
               break;
    case AIN1: 
    case 48:   Serial.write(analogRead(Ains[0])>>4);break;
    case AIN2: 
    case 49:   Serial.write(analogRead(Ains[1])>>4);break;
    default:   break;
  }
 }
 //delay(10);
}