/* DYSV5Wv4
 *  Playing Random Tracks
 *  Mega 2560
 * 
 *  Player on Serial 1 (pins 18-19)
 */
byte volume = 0x40;
byte commandLength;
byte command[6];
int checkSum = 0;

void sendCommand(){
  int q;
  for(q=0;q < commandLength;q++){
    Serial1.write(command[q]);
    Serial.print(command[q],HEX);
  }
  Serial.println("End");
}

void setup() {
  Serial.begin(115200);
  Serial1.begin(9600);
  Serial.println("DYSV5Wv4");

  //set volume to 17
  command[0] = 0xAA;//first byte says it's a command
  command[1] = 0x13;
  command[2] = 0x01;
  command[3] = 17;//volume
  checkSum = 0;
  for(int q=0;q<4;q++){
    checkSum +=  command[q]; 
  }
  command[4] = lowByte(checkSum);//SM check bit... low bit of the sum of all previous values
  commandLength = 5;
  sendCommand();

//play track

  
  //select random mode
  command[0] = 0xAA;//first byte says it's a command
  command[1] = 0x18;
  command[2] = 0x01;
  command[3] = 0x03;//random
  checkSum = 0;
  for(int q=0;q<4;q++){
    checkSum +=  command[q]; 
  }
  command[4] = lowByte(checkSum);//SM check bit... low bit of the sum of all previous values
  commandLength = 5;
  sendCommand();
  
  //play track
  command[0] = 0xAA;//first byte says it's a command
  command[1] = 0x02;
  command[2] = 0x00;
  command[3] = 0xAC;
  commandLength = 4;
  sendCommand();
}

void loop() {
  
}