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/* ----------------------------------------------------------------------------
* ATMEL Microcontroller Software Support
* ----------------------------------------------------------------------------
* Copyright (c) 2008, Atmel Corporation
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the disclaimer below.
*
* Atmel's name may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ----------------------------------------------------------------------------
*/
//------------------------------------------------------------------------------
/// \unit
///
/// !!!Purpose
///
/// Class for manipulating USB %audio feature unit descriptor.
///
/// !!!Usage
///
/// -# Declare an AUDFeatureUnitDescriptor instance as part of the
/// configuration descriptors returned by a USB %audio %device.
//------------------------------------------------------------------------------
#ifndef AUDFEATUREUNITDESCRIPTOR_H
#define AUDFEATUREUNITDESCRIPTOR_H
//------------------------------------------------------------------------------
// Definitions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
/// \page "USB Audio Channel controls"
///
/// This page lists the available controls for each channel of the audio
/// interface. Each channel can have any control combination; simply perform
/// a bitwise OR ('|') to combine several values.
///
/// !Controls
/// -# AUDFeatureUnitDescriptor_MUTE
/// -# AUDFeatureUnitDescriptor_VOLUME
/// -# AUDFeatureUnitDescriptor_BASS
/// -# AUDFeatureUnitDescriptor_MID
/// -# AUDFeatureUnitDescriptor_TREBLE
/// Channel mute control.
#define AUDFeatureUnitDescriptor_MUTE (1 << 0)
/// Channel volume control.
#define AUDFeatureUnitDescriptor_VOLUME (1 << 1)
/// Channel bass control.
#define AUDFeatureUnitDescriptor_BASS (1 << 2)
/// Channel middle control.
#define AUDFeatureUnitDescriptor_MID (1 << 3)
/// Channel treble control.
#define AUDFeatureUnitDescriptor_TREBLE (1 << 4)
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
// Types
//------------------------------------------------------------------------------
#ifdef __ICCARM__ // IAR
#pragma pack(1) // IAR
#define __attribute__(...) // IAR
#endif // IAR
//------------------------------------------------------------------------------
/// Describes available controls for each channel of the unit or terminal
/// it is connected to. This type must be augmented with the relevant number
/// of bmaControls fields and the iFeature field.
//------------------------------------------------------------------------------
typedef struct {
/// Size of descriptor in bytes.
unsigned char bLength;
/// Descriptor type (AUDGenericDescriptor_INTERFACE).
unsigned char bDescriptorType;
/// Descriptor subtype (AUDGenericDescriptor_FEATURE).
unsigned char bDescriptorSubType;
/// Identifier of this feature unit.
unsigned char bUnitID;
/// Identifier of the unit or terminal this feature unit is connected to.
unsigned char bSourceID;
/// Size in bytes of a channel controls field.
unsigned char bControlSize;
} __attribute__ ((packed)) AUDFeatureUnitDescriptor; // GCC
#ifdef __ICCARM__ // IAR
#pragma pack() // IAR
#endif // IAR
#endif //#ifndef AUDFEATUREUNITDESCRIPTOR_H
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