usbgenericdescriptor.h

Atmel的AT91SAM7x256芯片的usb存储的源程序

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/*
    Title: USBGenericDescriptor

    About: Purpose
        Definition of a generic USB descriptor class.
*/

#ifndef USBGENERICDESCRIPTOR_H
#define USBGENERICDESCRIPTOR_H

//------------------------------------------------------------------------------
//         Definitions
//------------------------------------------------------------------------------
/*
    Constants: Descriptor types
        USBGenericDescriptor_DEVICE - Device descriptor type.
        USBGenericDescriptor_CONFIGURATION - Configuration descriptor type.
        USBGenericDescriptor_STRING - String descriptor type.
        USBGenericDescriptor_INTERFACE - Interface descriptor type.
        USBGenericDescriptor_ENDPOINT - Endpoint descriptor type.
        USBGenericDescriptor_DEVICEQUALIFIER - Device qualifier descriptor type.
        USBGenericDescriptor_OTHERSPEEDCONFIGURATION - Other speed configuration
                                                       descriptor type.
        USBGenericDescriptor_INTERFACEPOWER - Interface power descriptor type.
*/
#define USBGenericDescriptor_DEVICE                     1
#define USBGenericDescriptor_CONFIGURATION              2
#define USBGenericDescriptor_STRING                     3
#define USBGenericDescriptor_INTERFACE                  4
#define USBGenericDescriptor_ENDPOINT                   5
#define USBGenericDescriptor_DEVICEQUALIFIER            6
#define USBGenericDescriptor_OTHERSPEEDCONFIGURATION    7
#define USBGenericDescriptor_INTERFACEPOWER             8

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

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

/*
    Type: USBGenericDescriptor
        Holds the few fields shared by all USB descriptors.

    Variables:
        bLength - Length of the descriptor in bytes.
        bDescriptorType - Descriptor type.
*/
typedef struct {

    unsigned char bLength;
    unsigned char bDescriptorType;

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

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

//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------
/*
    Function: USBGenericDescriptor_GetLength
        Returns the length of a descriptor.

    Parameters:
        descriptor - Pointer to a USBGenericDescriptor instance.

    Returns:
        Length of descriptor in bytes.
*/
extern unsigned int USBGenericDescriptor_GetLength(
    const USBGenericDescriptor *descriptor);

/*
    Function: USBGenericDescriptor_GetType
        Returns the type of a descriptor.

    Parameters:
        descriptor - Pointer to a USBGenericDescriptor instance.

    Returns:
        Type of descriptor.
*/
extern unsigned char USBGenericDescriptor_GetType(
    const USBGenericDescriptor *descriptor);

/*
    Function: USBGenericDescriptor_GetNextDescriptor
        Returns a pointer to the descriptor right after the given one, when
        parsing a Configuration descriptor.

    Parameters:
        descriptor - Pointer to a USBGenericDescriptor instance.

    Returns:
        Pointer to the next descriptor.
*/
extern USBGenericDescriptor *USBGenericDescriptor_GetNextDescriptor(
    const USBGenericDescriptor *descriptor);

#endif //#ifndef USBGENERICDESCRIPTOR_H