Resolves issues using play_file and start/stop_tone

[kattni]

Added deinit() to both. You still get a RuntimeError of DAC already in use if you are currently playing a tone using start_tone and then try to play_file before ending the tone. Added try and except to play_file to avoid this error if these functions are used in this manner.

[caternuson]

I think you are right that its just a library issue. Its a simple fix though. Concurrency is tricky. :-)

[caternuson]

This shouldn't require the try: except:. I think you need a stop_tone() call at the start of this in case one does:

cpx.start_tone(440)
cpx.play_file("sample.wav")

I'd also suggest using with to manage making sure deinit is called:

            if sys.implementation.version[0] >= 3:
                with audioio.AudioOut(board.SPEAKER) as audio:
                    wavefile = audioio.WaveFile(open(file_name, "rb"))
                    audio.play(wavefile)
                    while audio.playing:
                        pass
            else:
                with audioio.AudioOut(board.SPEAKER, open(file_name, "rb")) as audio:
                    audio.play()
                    while audio.playing:
                        pass

I also renamed file to wavefile because file is/was a python keyword which can make things weird later.

[kattni]

Thanks for the suggestion! Tested successfully with suggested changes.

[caternuson]

Yep. Looks good!