usbinterfacerequest.c

Atmel的AT91SAM7x256芯片的usb存储的源程序

/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support  -  ROUSSET  -
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/*
    Title: USBInterfaceRequest

    About: Purpose
        Implementation of USBInterfaceRequest class methods.
*/

//------------------------------------------------------------------------------
//         Headers
//------------------------------------------------------------------------------

#include "USBInterfaceRequest.h"

//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------
/*
    Function: USBInterfaceRequest_GetInterface
        Indicates which interface is targetted by a GET_INTERFACE or
        SET_INTERFACE request.

    Parameters:
        request - Pointer to a USBGenericRequest instance.

    Returns:
        Interface number.
*/
unsigned char USBInterfaceRequest_GetInterface(const USBGenericRequest *request)
{
    return (USBGenericRequest_GetIndex(request) & 0xFF);
}

/*
    Function: USBInterfaceRequest_GetAlternateSetting
        Indicates the new alternate setting that the interface targetted by a
        SET_INTERFACE request should use.

    Parameters:
        request - Pointer to a USBGenericRequest instance.

    Returns:
        New active setting for the interface.
*/
unsigned char USBInterfaceRequest_GetAlternateSetting(
    const USBGenericRequest *request)
{
    return (USBGenericRequest_GetValue(request) & 0xFF);
}