Microphone level maxes out at ~191 on hardware

[microbit-mark]

Writing the value of sound level to serial, the loudest sound level returned seems to be between 191-195. The returned level should be up to 255

https://makecode.microbit.org/_LMvK17UKMaeA

Does not reproduce in MicroPython, so I assume this is MakeCode related, not CODAL.

[microbit-mark]

@abchatra can you take a look at this one and try and reproduce?

[abchatra]

Does this not reproduce in python when writing to serial? Does this reproduce if we don't write to serial but just displayed on the screen?

I will take a look.

[jaustin]

@microbit-carlos do you think this is still an issue?

[microbit-carlos]

This was fixed in CODAL in:

• Sound level in MakeCode never reaches high values lancaster-university/codal-microbit-v2#225

As part of that MakeCode should have been updated to use uBit.audio.levelSPL->setUnit(LEVEL_DETECTOR_SPL_8BIT) as described in lancaster-university/codal-microbit-v2#225 (comment), which I think it might not have been implemented yet:
https://github.com/microsoft/pxt-microbit/blob/v6.1.8/libs/microphone/microphone.cpp

[microbit-carlos]

@riknoll updating microphone to use the uBit object was already partially done in b3a0130 and the only thing left would be to :

• On init, set the sound level output type via uBit.audio.levelSPL->setUnit(LEVEL_DETECTOR_SPL_8BIT)
• setSoundThreshold() would call uBit.audio.levelSPL->setLowThreshold() or setHighThreshold() directly with the user input value
• soundLevel() would just return uBit.audio.levelSPL->getValue()