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cpb: Disable the onboard speaker until request#2262
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.. the existing code, which was never activated by the preprocessor, wasn't quite right.
This allows the board to disable the onboard speaker until explicitly
enabled in user code.
Testing performed on a CPB:
* Touching the AUDIO pin with a fingertip no longer generates noise/buzz
* Generating a waveform with `simpleio.tone` produces no sound by default
* When the board.SPEAKER_ENABLE is configured as a digital output and
set True, `simpleio.tone` does produce sound
Note that while guides should include information about SPEAKER_ENABLE, it's
possible that some users who omitted it could view this as a breaking change.
They can fix it by simply adding code similar to
speaker_enable = digitalio.DigitalInOut(board.SPEAKER_ENABLE)
speaker_enable.direction = digitalio.Direction.OUTPUT
speaker_enable.value = True
before using the internal speaker.
Closes: adafruit#2258
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This allows the board to disable the onboard speaker until explicitly enabled in user code.
Testing performed on a CPB:
simpleio.toneproduces no sound by defaultset True,
simpleio.tonedoes produce soundNote that while guides should include information about SPEAKER_ENABLE, it's possible that some users who omitted it could view this as a breaking change. They can fix it by simply adding code similar to
before using the internal speaker.
Closes: #2258