usbinterfacedescriptor.h

本代bootloader通过usb下载代码首先存放在sdram中

/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
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 * Copyright (c) 2008, Atmel Corporation
 *
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/**
 \unit

 !!!Purpose

    Definition of a class for manipulating USB interface descriptors.

 !!!Usage

    - Declare USBInterfaceDescriptor instance as a part of the configuration
      descriptors of a USB device.

*/

#ifndef USBINTERFACEDESCRIPTOR_H
#define USBINTERFACEDESCRIPTOR_H

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

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

//------------------------------------------------------------------------------
/// USB standard interface descriptor structure.
//------------------------------------------------------------------------------
typedef struct {

   /// Size of the descriptor in bytes.
   unsigned char bLength;
   /// Descriptor type (USBGenericDescriptor_INTERFACE).
   unsigned char bDescriptorType;
   /// Number of the interface in its configuration.
   unsigned char bInterfaceNumber;
   /// Value to select this alternate interface setting.
   unsigned char bAlternateSetting;
   /// Number of endpoints used by the inteface (excluding endpoint 0).
   unsigned char bNumEndpoints;
   /// Interface class code.
   unsigned char bInterfaceClass;
   /// Interface subclass code.
   unsigned char bInterfaceSubClass;
   /// Interface protocol code.
   unsigned char bInterfaceProtocol;
   /// Index of the interface string descriptor.
   unsigned char iInterface;
                                    
} __attribute__ ((packed)) USBInterfaceDescriptor; // GCC

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

#endif //#ifndef USBINTERFACEDESCRIPTOR_H