auddataendpointdescriptor.h

本代bootloader通过usb下载代码首先存放在sdram中

/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
 *
 * All rights reserved.
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//------------------------------------------------------------------------------
/// \unit
///
/// !!!Purpose
/// 
/// Definition of the USB audio-specific data endpoint descriptor.
///
/// !!!Usage
/// 
/// -# Declare an AUDDataEndpointDescriptor instance as part of the
///    configuration descriptors of a USB %audio %device.
//------------------------------------------------------------------------------

#ifndef AUDDATAENDPOINTDESCRIPTOR_H
#define AUDDATAENDPOINTDESCRIPTOR_H

//------------------------------------------------------------------------------
//         Definitions
//------------------------------------------------------------------------------

/// Descriptor subtype for an Audio data endpoint.
#define AUDDataEndpointDescriptor_SUBTYPE                   0x01

//------------------------------------------------------------------------------
/// \page "USB Audio Lock delay units"
///
/// This page lists the valid lock delay unit types.
/// 
/// !Units
/// - AUDDataEndpointDescriptor_MILLISECONDS
/// - AUDDataEndpointDescriptor_PCMSAMPLES

/// Lock delay is expressed in milliseconds.
#define AUDDataEndpointDescriptor_MILLISECONDS              1

/// Lock delay is expressed in decoded PCM samples.
#define AUDDataEndpointDescriptor_PCMSAMPLES                2
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
//         Types
//------------------------------------------------------------------------------

#ifdef __ICCARM__          // IAR
#pragma pack(1)            // IAR
#define __attribute__(...) // IAR
#endif                     // IAR

//------------------------------------------------------------------------------
/// Gives additional information about an USB endpoint used to transmit audio
/// data to or from the host.
//------------------------------------------------------------------------------
typedef struct {

    /// Size of descriptor in bytes.
    unsigned char bLength;
    /// Descriptor type (AUDGenericDescriptor_ENDPOINT).
    unsigned char bDescriptorType;
    ///  Descriptor subtype  (AUDDataEndpointDescriptor_SUBTYPE).
    unsigned char bDescriptorSubType;
    /// Indicates available controls and requirement on packet sizes.
    unsigned char bmAttributes;
    /// Indicates the units of the wLockDelay fields.
    /// \sa "USB Audio Lock delay units"
    unsigned char bLockDelayUnits;
    /// Time it takes for the endpoint to lock its internal clock circuitry.
    unsigned short wLockDelay;

} __attribute__ ((packed)) AUDDataEndpointDescriptor; // GCC

#ifdef __ICCARM__          // IAR
#pragma pack()             // IAR
#endif                     // IAR

#endif //#ifndef AUDDATAENDPOINTDESCRIPTOR_H