/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
 *
 * All rights reserved.
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/*
    Title: USBGetDescriptorRequest implementation

    About: Purpose
        Implementation of the USBGetDescriptorRequest class.
*/

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

#include "USBGetDescriptorRequest.h"

//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------
/*
    Function: USBGetDescriptorRequest_GetDescriptorType
        Returns the type of the descriptor requested by the host given the
        corresponding GET_DESCRIPTOR request.

    Parameters:
        request - Pointer to a USBGenericDescriptor instance.

    Returns:
        Type of the requested descriptor.
*/
unsigned char USBGetDescriptorRequest_GetDescriptorType(
    const USBGenericRequest *request)
{
    // Requested descriptor type is in the high-byte of the wValue field
    return (USBGenericRequest_GetValue(request) >> 8) & 0xFF;
}

/*
    Function: USBGetDescriptorRequest_GetDescriptorIndex
        Returns the index of the requested descriptor, given the corresponding
        GET_DESCRIPTOR request.

    Parameters:
        request - Pointer to a USBGenericDescriptor instance.

    Returns:
        Index of the requested descriptor.
*/
unsigned char USBGetDescriptorRequest_GetDescriptorIndex(
    const USBGenericRequest *request)
{
    // Requested descriptor index if in the low byte of the wValue field
    return USBGenericRequest_GetValue(request) & 0xFF;
}