Bit-Depth Reporting

[jmag99]

Is there an easy way to get the bit-depth sent by the PC over USB? I'd like to use this information to setup the dac/adc in a project.

[infiniteimprobability]

If you look in descriptors_2.h (which belongs to endpoint zero) you can see:

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bSubslotSize (Number of bytes per subslot)

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subFrameSize

and

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bBitResolution

These define the number of bytes sent by the host and the number of bits used. Both are 24b, but USB audio class 1 uses 3 bytes and audio class 2 uses 4 bytes. These are fixed at compile time.