usbfeaturerequest.c

Atmel的AT91SAM9263芯片的usb存储源程序

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 *         ATMEL Microcontroller Software Support  -  ROUSSET  -
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/*
    Title: USBFeatureRequest implementation

    About: Purpose
        Implementation of the USBFeatureRequest class.
*/

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

#include "USBFeatureRequest.h"

//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------
/*
    Function: USBFeatureRequest_GetFeatureSelector
        Returns the feature selector of a given CLEAR_FEATURE or SET_FEATURE
        request.

    Parameters:
        request - Pointer to a USBGenericRequest instance.

    Returns:
        Feature selector.
*/
unsigned char USBFeatureRequest_GetFeatureSelector(
    const USBGenericRequest *request)
{
    return USBGenericRequest_GetValue(request);
}

/*
    Function: USBFeatureRequest_GetTestSelector
        Indicates the test that the device must undertake following a
        SET_FEATURE request.

    Parameters:
        request - Pointer to a USBGenericRequest instance.

    Returns:
        Test selector.
*/
unsigned char USBFeatureRequest_GetTestSelector(
    const USBGenericRequest *request)
{
    return (USBGenericRequest_GetIndex(request) >> 8) & 0xFF;
}