audendpointdescriptor.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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 * modification, are permitted provided that the following conditions are met:
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 * 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.
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 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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 */

//------------------------------------------------------------------------------
/// \unit
///
/// !!!Purpose
///
/// Re-definition of the standard USB endpoint descriptor with two additional
/// fields. This is required by the USB audio 1.00 specification.
///
/// !!!Usage
///
/// -# Declare an AUDEndpointDescriptor instance as part of the configuration
///    descriptors of an USB %audio %device.
//------------------------------------------------------------------------------

#ifndef AUDENDPOINTDESCRIPTOR_H
#define AUDENDPOINTDESCRIPTOR_H

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

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

//------------------------------------------------------------------------------
/// Modified endpoint descriptor with two additional fields, with are
/// USB audio specific.
//------------------------------------------------------------------------------
typedef struct {

   /// Size of the descriptor in bytes.
   unsigned char bLength;
   /// Descriptor type (USBGenericDescriptor_ENDPOINT).
   unsigned char bDescriptorType;
   /// Address and direction of the endpoint.
   unsigned char bEndpointAddress;
   /// Endpoint type and additional characteristics (for isochronous endpoints).
   unsigned char bmAttributes;
   /// Maximum packet size (in bytes) of the endpoint.
   unsigned short wMaxPacketSize;
   /// Polling rate of the endpoint.
   unsigned char bInterval;
   /// Refresh rate for a feedback endpoint.
   unsigned char bRefresh;
   /// Address of the associated feedback endpoint if any.
   unsigned char bSyncAddress;
                                   
} __attribute__ ((packed)) AUDEndpointDescriptor; // GCC

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

#endif //#ifndef AUDENDPOINTDESCRIPTOR_H