Fix for problems with SPDIF3

PaulStoffregen / Audio

Teensy Audio Library

http://www.pjrc.com/teensy/td_libs_Audio.html

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Fix for problems with SPDIF3 #435

Closed h4yn0nnym0u5e closed 2 years ago

h4yn0nnym0u5e commented 2 years ago

AudioOutputSPDIF3 was flushing cache before writing the memory, so stale data was being DMAed out.
ADAT had no cache flush (change is untested)
SPDIF buffer was not being zeroed, so could output brief garbage audio at startup

PaulStoffregen commented 2 years ago

Please change this to use arm_dcache_flush() rather than directly manipulating SCB_CACHE_DCCIMVAC.

h4yn0nnym0u5e commented 2 years ago

You were too quick doing the merge ... I used arm_dcache_flush_delete(), which was actually a better match for the original code, but appears to be about 1us slower. I've fixed it, but you'd already merged!

PaulStoffregen commented 2 years ago

no worries, just send another PR