/*
  CI-V Icom band decode for PTT

  Language: Wiring/Arduino

  ON6MH - ON5AV V1.0 05/2020
*/

int band;         // current band   1 = 2M  2 = 70CM  3 = 23CM

// for CI-V decode

int inByte = 0;         // incoming serial byte
int soByte = 0;
int deByte = 0;
int cmByte = 0;
int f1Byte = 0;
int f2Byte = 0;
int f3Byte = 0;
int f4Byte = 0;
int f5Byte = 0;
int stByte = 0;

void setup()
{
  // start serial port at 9600 bps:
  Serial.begin(9600);


  //for relais driving

  pinMode(2, OUTPUT); digitalWrite(2, LOW);  // relay 144
  pinMode(3, OUTPUT); digitalWrite(3, LOW);  // relay 432
  pinMode(4, OUTPUT); digitalWrite(4, LOW);  // relay 1296

  // set band to 0 (unknown) no CI-V decoded yet

  band = 0;

Serial.println("setup completed ......................");
}

void loop()
{
  if (Serial.available() > 0) {
    inByte = Serial.read();
    if (inByte == 254) {                        // see if we have $FE
      delay(3);                                       // wait 3 ms to be sure next byte arrived
      inByte = Serial.read();                 // read byte
      if (inByte == 254) {                     // if is $FE then we get preamble ok
        delay(3);                                     // wait 3 ms to be sure next byte arrived
        deByte = Serial.read();              // read destination of message
        delay(3);
        soByte = Serial.read();               // read source of message
        delay(3);
        cmByte = Serial.read();             // read command
        if (cmByte == 0 || cmByte == 3 || cmByte == 5) {   // $00 $03 $05 = frequency data
          delay(3);
          f1Byte = Serial.read();         // read f byte 1
          delay(3);
          f2Byte = Serial.read();         // read f byte 2
          delay(3);
          f3Byte = Serial.read();         // read f byte 3
          delay(3);
          f4Byte = Serial.read();         // read f byte 4
          delay(3);
          f5Byte = Serial.read();         // read f byte 5
          delay(3);
          stByte = Serial.read();         // should be $FD end of message

          if (stByte == 253) {            // stop byte ok

            switch (f5Byte) {

    case 0:    // 100 Mhz = 0
    Serial.println("-------------------Rien");
      digitalWrite(2, LOW);    // relay 144
      digitalWrite(3, LOW);    // relay 432
      digitalWrite(4, LOW);    // relay 1296

      break;

    case 01:    // 144 detected
    Serial.println("-------------------144MHZ");
 
      digitalWrite(2, HIGH);   // relay 144
      digitalWrite(3, LOW);    // relay 432
      digitalWrite(4, LOW);    // relay 1296

      break;

    case 04:    // 432 detected
    Serial.println("-------------------432MHZ");
      digitalWrite(2, LOW);    // relay 144
      digitalWrite(3, HIGH);   // relay 432
      digitalWrite(4, LOW);    // relay 1296
      break;

    case 18:    // 1.296 detected
    Serial.println("-------------------1296MHZ");
      digitalWrite(2, LOW);    // relay 144
      digitalWrite(3, LOW);    // relay 432
      digitalWrite(4, HIGH);   // relay 1296
      break;

/*                                                   
                               Serial.print("destination: ");    //for debug
                               Serial.println(deByte, HEX);
                               Serial.print("source: ");
                               Serial.println(soByte, HEX);
                               Serial.print("command: ");
                               Serial.println(cmByte, HEX);
                               Serial.print("f byte 1: ");
                               Serial.println(f1Byte, HEX);
                               Serial.print("f byte 2: ");
                               Serial.println(f2Byte, HEX);
                               Serial.print("f byte 3: ");
                               Serial.println(f3Byte, HEX);
                               Serial.print("f byte 4: ");
                               Serial.println(f4Byte, HEX);
                               Serial.print("f byte 5: ");
                               Serial.println(f5Byte, HEX);
                               Serial.print("end byte FD: ");
                               Serial.println(stByte, HEX);
*/                             
         }
        }
       } 
      }
     }
    } 
  }