const int busyPin = 8;
byte volume = 0x40;
byte commandLength;
byte command[6];
int checkSum = 0;
int soundTrack = 114;
int PinButton1 = 10;
int val1 = 0;
int playStatus = 1;
int trackNumber = 4;
int randNumb1 = 0;
int randNumb2 =0;

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

void stopPlay(){
  command[0] = 0xAA;//first byte says it's a command
  command[1] = 0x04;
  command[2] = 0x00;
  command[3] = 0xAE;
  commandLength = 4;
  sendCommand();
}

void regPlay(){
  command[0] = 0xAA;//first byte says it's a command
  command[1] = 0x02;
  command[2] = 0x00;
  command[3] = 0xAC;
  commandLength = 4;
  sendCommand();
}

void newPlay(){
  command[0] = 0xAA;//first byte says it's a command
  command[1] = 0x07;
  command[2] = 0x02;
  command[3] = trackNumber >> 8;
  command[4] = trackNumber;
  command[5] = (0xAA + 0x07 + 0x02 + (trackNumber >> 8) + trackNumber);
  commandLength = 6;
  sendCommand();

  //int command[] = {0xAA, 0x07, 0x02, (byte)(trackNumber >> 8), (byte)(trackNumber & 0xFF), (byte)(0xAA + 0x07 + 0x02 + (trackNumber >> 8) + (trackNumber & 0xFF))};
  //commandLength =  6;
  /*uint16_t Mike[] = {124, 164, 725, 496, 8243};
  
  int x;
  for(x=0;x<5;x++){
    Serial.print(Mike[x]);
  //Serial.println(newCommand[x]);
  }
  Serial.println("End");*/
  //sendCommand();
  //Serial1.write(command, sizeof(command));
  //Serial.print(command);
}

void setup() {
  Serial.begin(115200);
  Serial1.begin(9600);
  delay(1000);
  Serial.println("DYSV5Wv4");
  pinMode(PinButton1, INPUT);
}

void loop() {
  val1=digitalRead(PinButton1);
  randNumb1 = (rand() % 10);
  Serial.println(randNumb1);
  delay(randNumb1*100);
  switch (playStatus) {
    case 1:
      if (val1 == HIGH) {
        playStatus = 2;
        //Serial.print("Mike");
        newPlay();
        //regPlay();
        /*command[0] = 0xAA;//first byte says it's a command
        command[1] = 0x07;
        command[2] = 0x02;
        command[3] = highByte(soundTrack);//snh...track HIGH bit
        command[4] = lowByte(soundTrack);//SNL... track low bit
        checkSum = 0;
        for (int q = 0; q < 5; q++) {
           checkSum +=  command[q];
        }
        command[5] = lowByte(checkSum);//SM check bit... low bit of the sum of all previous values
        commandLength = 6;
        sendCommand();*/
        delay(100);
        //regPlay();
        //delay(1000);
        //newPlay();
      }
      break;
    case 2:
      if(val1 == LOW){
        playStatus = 1;
        //newPlay();
        stopPlay();
        delay(100);
      }
      break;
    default:
      break;
  }
}

/*
byte volume = 0x40;
byte commandLength;
byte command[6];
int checkSum = 0;
int soundTrack = 3;

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();
/*
  //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();
  
  //pick track
  command[0] = 0xAA;//first byte says it's a command
  command[1] = 0x07;
  command[2] = 0x02;
  command[3] = highByte(soundTrack);//snh...track HIGH bit
  command[4] = lowByte(soundTrack);//SNL... track low bit
  checkSum = 0;
  for (int q = 0; q < 5; q++) {
    checkSum +=  command[q];
  }
  command[5] = lowByte(checkSum);//SM check bit... low bit of the sum of all previous values
  commandLength = 6;
  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() {
  
}



/*byte commandLength;
byte command[5];
int checkSum = 0;
int trackNum = 4;

void playTrack(int soundTrack) {
  command[0] = 0xAA;//first byte says it's a command
  command[1] = 0x07;
  command[2] = 0x02;
  command[3] = highByte(soundTrack);//snh...track HIGH bit
  command[4] = lowByte(soundTrack);//SNL... track low bit
  checkSum = 0;
  for (int q = 0; q < 5; q++) {
    checkSum +=  command[q];
  }
  command[5] = lowByte(checkSum);//SM check bit... low bit of the sum of all previous values
  commandLength = 6;
  sendCommand();
}

void playbackVolume(int vol) {
  if (vol > 30) { //check within limits
    vol = 30;
  }
  command[0] = 0xAA;//first byte says it's a command
  command[1] = 0x13;
  command[2] = 0x01;
  command[3] = vol;//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;
  //Serial.println("Mid");
  sendCommand();
}

void sendCommand() {
  //Serial.println("send");
  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);
  playbackVolume(18);//sets volume to lvl 17
}

void loop() {
    playTrack(trackNum);
    delay(3000);
}



//const int busyPin = 8;//change to any suitable digital pin
byte commandLength;
byte command[5];
int checkSum = 0;

int trackNum = 4;
//int playStatus; //0 playing 1 stopped 2 waiting to start next track
//unsigned long lastCheckTime;
//unsigned long currentMillis;
//int busyPinstate = 0;

void playTrack(int soundTrack) {
  //Serial.println("playtrack");
  //select track
  //Serial.print("soundTrack: ");
  //Serial.println(soundTrack);
  command[0] = 0xAA;//first byte says it's a command
  command[1] = 0x07;
  command[2] = 0x02;
  command[3] = highByte(soundTrack);//snh...track HIGH bit
  command[4] = lowByte(soundTrack);//SNL... track low bit
  checkSum = 0;
  for (int q = 0; q < 5; q++) {
    checkSum +=  command[q];
  }
  command[5] = lowByte(checkSum);//SM check bit... low bit of the sum of all previous values
  commandLength = 6;
  //Serial.println("playtrack");
  sendCommand();
}

//plays whatever track has been paused or 1st track if nothing selected
//May need to be selected after putting into random mode
/*void play() {
  Serial.println("play");
  command[0] = 0xAA;//first byte says it's a command
  command[1] = 0x02;
  command[2] = 0x00;
  command[3] = 0xAC;
  commandLength = 4;
  sendCommand();
}*/
/*
//sets the device volume...0 - 30
void playbackVolume(int vol) {
  //Serial.println("playbackvolume");
  if (vol > 30) { //check within limits
    vol = 30;
  }
  command[0] = 0xAA;//first byte says it's a command
  command[1] = 0x13;
  command[2] = 0x01;
  command[3] = vol;//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;
  //Serial.println("Mid");
  sendCommand();
}

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

void setup() {
  //Serial.println("setup");
  Serial.begin(115200);
  Serial1.begin(9600);
  //Serial.println("DYSV5Wv7");

  //pinMode(busyPin, INPUT);//pin to read from DY-SV5W buyPin
  
  playbackVolume(18);//sets volume to lvl 17
}

void loop() {
    playTrack(trackNum);
    delay(1000);
    //break;
}

/*
void loop() {
  //Serial.println("loop");
  currentMillis = millis();//stores time in millis() for non blocking timings
  busyPinstate = digitalRead(busyPin);
  if (busyPinstate > 0) { //nothing playing
    if (playStatus < 1) {
      playStatus = 1;
      lastCheckTime = currentMillis;//set system ready for 2 sec delay
    }
  }
  switch (playStatus) {
    case 1:
      if (currentMillis - lastCheckTime >= 2000) { //2000 = 2 seconds of silence between tracks
        playStatus = 2;
        trackNum = 4;//fixed track number
        playTrack(trackNum);
      }
      break;
    case 2:
      if(busyPinstate < 1){
        playStatus = 0;  
      }
      break;
    default:
      break;
  }
}*/