IAR generates warning Pe111 'statement is unreachable'. In a couple of
cases, replace return statements with TU_ATTR_FALLTHROUGH; because some
compilers apparently can't figure out that the return statements are
unreachable but do whinge about an imagined fall-through without them!
This example code creates USB Audio 2.0 headset device.
Device has two audio interfaces first stereo speaker
with 48kHz stereo stream.
Second interface for microphone with 48kHz mono stream.
This example can be used to start working on audio device.
It can be also used to verify ISO endpoints for boards.
Speaker adaptive clock (bound to SOF).
Microphone for now has asynchronous clock.
Volume and mute control while present are not used for data stream
modification.
