Volume Control - XMOS xCORE-200 Multi-channel Audio board Design Manual

USB Audio Design Guide
Description Sample sub-slot size (bytes) of input stream Alternate 1 when running in full-
speed.
Note, in full-speed mode bus bandwidth is at a premium, therefore pack samples
into smallest possible sub-slot.
Default: STREAM_FORMAT_INPUT_1_RESOLUTION_BITS / 8
Macro STREAM_FORMAT_INPUT_1_DATAFORMAT
Description Sample audio data-format for input stream Alternate 1.
Default: UAC_FORMAT_TYPEI_PCM

7.1.8 Volume Control

Macro OUTPUT_VOLUME_CONTROL
Description Enable/disable output volume control including all processing and descriptor
support.
Default: 1 (Enabled)
Macro INPUT_VOLUME_CONTROL
Description Enable/disable input volume control including all processing and descriptor
support.
Default: 1 (Enabled)
Macro MIN_VOLUME
Description The minimum volume setting above -inf.
This is a signed 8.8 fixed point number that must be strictly greater than -128
(0x8000)
Default: 0x8100 (-127db)
Macro MAX_VOLUME
The maximum volume setting.
Description
This is a signed 8.8 fixed point number.
Default: 0x0000 (0db)
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