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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
///
/// Definitions for using USB %audio format type I descriptors.
///
/// !!!Usage
///
/// -# Declare an instance of AUDFormatTypeOneDescriptor as part of the
/// configuration descriptors of an audio device.
//------------------------------------------------------------------------------
#ifndef AUDFORMATTYPEONEDESCRIPTOR_H
#define AUDFORMATTYPEONEDESCRIPTOR_H
//------------------------------------------------------------------------------
// Definitions
//------------------------------------------------------------------------------
/// Format type for a format type I descriptor.
#define AUDFormatTypeOneDescriptor_FORMATTYPEONE 0x01
/// AUDFormatTypeOneDescriptor_PCM - PCM format.
#define AUDFormatTypeOneDescriptor_PCM 0x0001
/// Indicates the sampling frequency can have any value in the provided range.
#define AUDFormatTypeOneDescriptor_CONTINUOUS 0
//------------------------------------------------------------------------------
// Types
//------------------------------------------------------------------------------
#ifdef __ICCARM__ // IAR
#pragma pack(1) // IAR
#define __attribute__(...) // IAR
#endif // IAR
//------------------------------------------------------------------------------
/// Describes an audio data stream that is constructed on a sample-by-sample
/// basis. This type must be augmented with either the continuous sampling
/// frequency range (if bSamFreqType = <AUDFormatTypeOneDescriptor_CONTINUOUS>)
/// or with an array containing the possible discrete frequencies.
//------------------------------------------------------------------------------
typedef struct {
/// Size of descriptor in bytes.
unsigned char bLength;
/// Descriptor type (AUDGenericDescriptor_INTERFACE).
unsigned char bDescriptorType;
/// Descriptor subtype (AUDStreamingInterfaceDescriptor_FORMATTYPE).
unsigned char bDescriptorSubType;
/// Format type (AUDFormatTypeOneDescriptor_FORMATTYPEONE).
unsigned char bFormatType;
/// Number of physical channels in the audio stream.
unsigned char bNrChannels;
/// Number of bytes occupied by one audio subframe.
unsigned char bSubFrameSize;
/// Number of bits effectively used in an audio subframe.
unsigned char bBitResolution;
/// Number of supported discrete sampling frequencies, or
/// AUDFormatTypeOneDescriptor_CONTINUOUS.
unsigned char bSamFreqType;
} __attribute__ ((packed)) AUDFormatTypeOneDescriptor; // GCC
#ifdef __ICCARM__ // IAR
#pragma pack() // IAR
#endif // IAR
#endif //#ifndef AUDFORMATTYPEONEDESCRIPTOR_H
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