LUFA Library  120219
USB_Audio_Descriptor_FeatureUnit_t Struct Reference

Audio class-specific Feature Unit Descriptor (LUFA naming conventions). More...

#include <AudioClassCommon.h>

Data Fields

USB_Descriptor_Header_t Header
uint8_t Subtype
uint8_t UnitID
uint8_t SourceID
uint8_t ControlSize
uint8_t ChannelControls [3]
uint8_t FeatureUnitStrIndex

Detailed Description

Type define for an Audio class-specific Feature Unit descriptor. This indicates to the host what features are present in the device's audio stream for basic control, such as per-channel volume. See the USB Audio specification for more details.

See also:
USB_Audio_StdDescriptor_FeatureUnit_t for the version of this type with standard element names.
Regardless of CPU architecture, these values should be stored as little endian.

Field Documentation

Feature masks for the control channel, and each separate audio channel.

Size of each element in the ChannelControls array.

Index of a string descriptor describing this descriptor within the device.

Regular descriptor header containing the descriptor's type and length.

Source ID value of the audio source input into this feature unit.

Sub type value used to distinguish between audio class-specific descriptors, must be AUDIO_DSUBTYPE_CSInterface_Feature.

ID value of this feature unit - must be a unique value within the device.

The documentation for this struct was generated from the following file:
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