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

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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.

Note:

Regardless of CPU architecture, these values should be stored as little endian.

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Field Documentation

uint8_t USB_Audio_Descriptor_FeatureUnit_t::ChannelControls[3]

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

uint8_t USB_Audio_Descriptor_FeatureUnit_t::ControlSize

Size of each element in the ChannelControls array.

uint8_t USB_Audio_Descriptor_FeatureUnit_t::FeatureUnitStrIndex

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

USB_Descriptor_Header_t USB_Audio_Descriptor_FeatureUnit_t::Header

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

uint8_t USB_Audio_Descriptor_FeatureUnit_t::SourceID

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

uint8_t USB_Audio_Descriptor_FeatureUnit_t::Subtype

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

uint8_t USB_Audio_Descriptor_FeatureUnit_t::UnitID

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

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

• Drivers/USB/Class/Common/AudioClassCommon.h