UART Serial Read & Write to MP3 Player Doesn't Work

[bill_z]

Thanks Deanhystad,

You are correct that the board is expecting x/aa to start the command and a check sum byte to end it. Sorry you could not access the URL. I'll try to see what I can do about that.

There is some of this code that I do not understand being a beginner and all.

Just in attempting to learn, I ran your code and got errors. Something about not iterable. Error has something to do with for loops, in your case the 'while', I'm assuming. So I tested and that was not it.

Something to do with the '[]s'. I don't know how to fix.

Output:
$ sudo python3 SerialTest3.py
Traceback (most recent call last):
  File "SerialTest3.py", line 31, in <module>
    play_track(ser, [2, 0, 4])  # Track info?
  File "SerialTest3.py", line 21, in play_track
    write_command(port, [7].extend(track_info))
  File "SerialTest3.py", line 10, in write_command
    command = [170].extend(command)  # Command packet starts with 0xAA
TypeError: 'NoneType' object is not iterable