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

#include <AudioClassCommon.h>

Data Fields
uint8_t	bLength
uint8_t	bDescriptorType
uint8_t	bDescriptorSubtype
uint8_t	bUnitID
uint8_t	bSourceID
uint8_t	bControlSize
uint8_t	bmaControls [3]
uint8_t	iFeature

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_Descriptor_FeatureUnit_t for the version of this type with non-standard LUFA specific element names.

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

Field Documentation

uint8_t USB_Audio_StdDescriptor_FeatureUnit_t::bControlSize

Size of each element in the ChannelControls array.

uint8_t USB_Audio_StdDescriptor_FeatureUnit_t::bDescriptorSubtype

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

uint8_t USB_Audio_StdDescriptor_FeatureUnit_t::bDescriptorType

Type of the descriptor, either a value in USB_DescriptorTypes_t or a value given by the specific class.

uint8_t USB_Audio_StdDescriptor_FeatureUnit_t::bLength

Size of the descriptor, in bytes.

uint8_t USB_Audio_StdDescriptor_FeatureUnit_t::bmaControls[3]

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

uint8_t USB_Audio_StdDescriptor_FeatureUnit_t::bSourceID

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

uint8_t USB_Audio_StdDescriptor_FeatureUnit_t::bUnitID

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

uint8_t USB_Audio_StdDescriptor_FeatureUnit_t::iFeature

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

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

Drivers/USB/Class/Common/AudioClassCommon.h

Data Fields

Detailed Description

Field Documentation