Random play restricted with DFR Mini Player?

[Terrypin]

I use the DFR Mini MP3 Player module with the DFR library "DFRobotDFPlayerMini.h".

After executing the command

randomAll();

I've been assuming that it plays all files on the micro-SD card, at 'random'. For any of the several file and folder structures. Such as:

• folders \01 - \99 of up to 255 files (001.mp3 - 255.mp3)
• one large folder mp3\0001.mp3 - 1234.mp3 etc.
• a mix of 'regular' and 'large folders', the latter with files 0001.mp4 - 1234.mp3 etc.

But I now think that's not true. I tested it the only way I know, by using the command

readCurrentFileNumber();

After about a hundred readings, with a single folder 'mp3' holding 911 files with the 4-digit prefix, the highest number was 255.

That would be a fraction of the 3,600 files in my current project.

I could resort to coding my own random playing, but getting automatic play of each complete music track seems a challenge.

[UKHeliBob]

@Terrypin

the highest number was 255.

int DFRobotDFPlayerMini::readCurrentFileNumber(uint8_t device)

readCurrentFileNumber() returns an int. Which data type are you using to hold the value that it returns ?

[runaway_pancake]

uint8_t is a byte though

[UKHeliBob]

But it is only used to select the device type being used

int DFRobotDFPlayerMini::readCurrentFileNumber(uint8_t device){
  switch (device) {
    case DFPLAYER_DEVICE_U_DISK:
      sendStack(0x4B);
      break;
    case DFPLAYER_DEVICE_SD:
      sendStack(0x4C);
      break;
    case DFPLAYER_DEVICE_FLASH:
      sendStack(0x4D);
      break;
    default:
      break;
  }

[Terrypin]

There are two commands available:
readCurrentFileNumber(uint8_t device);
readCurrentFileNumber();

I'm using the latter, and it's declared as an int.

while (1 == 1)
    {
      myDFPlayer.randomAll(); //Random play all the mp3.
      delay(2000);
      int currentTrack = myDFPlayer.readCurrentFileNumber();
      Serial.print("currentTrack (raw) = ");
      Serial.println(currentTrack);
    }