usbgenericrequest.c

Include startup files and peripherial devices Code for Atmel ARM7 development

/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
 *
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 * this list of conditions and the disclaimer below.
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 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
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/*
    Title: USBGenericRequest implementation

    About: Purpose
        Implementation of the USBGenericRequest class.
*/

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

#include "USBGenericRequest.h"

//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
/// Returns the type of the given request.
/// \param request Pointer to a USBGenericRequest instance.
/// \return "USB Request Types"
//------------------------------------------------------------------------------
extern unsigned char USBGenericRequest_GetType(const USBGenericRequest *request)
{
    return ((request->bmRequestType >> 5) & 0x3);
}

//------------------------------------------------------------------------------
/// Returns the request code of the given request.
/// \param request Pointer to a USBGenericRequest instance.
/// \return Request code.
/// \sa "USB Request Codes"
//------------------------------------------------------------------------------
unsigned char USBGenericRequest_GetRequest(const USBGenericRequest *request)
{
    return request->bRequest;
}

//------------------------------------------------------------------------------
/// Returns the wValue field of the given request.
/// \param request - Pointer to a USBGenericRequest instance.
/// \return Request value.
//------------------------------------------------------------------------------
unsigned short USBGenericRequest_GetValue(const USBGenericRequest *request)
{
    return request->wValue;
}

//------------------------------------------------------------------------------
/// Returns the wIndex field of the given request.
/// \param request Pointer to a USBGenericRequest instance.
/// \return Request index;
//------------------------------------------------------------------------------
unsigned short USBGenericRequest_GetIndex(const USBGenericRequest *request)
{
    return request->wIndex;
}

//------------------------------------------------------------------------------
/// Returns the expected length of the data phase following a request.
/// \param request Pointer to a USBGenericRequest instance.
/// \return Length of data phase.
//------------------------------------------------------------------------------
unsigned short USBGenericRequest_GetLength(const USBGenericRequest *request)
{
    return request->wLength;
}

//------------------------------------------------------------------------------
/// Returns the endpoint number targetted by a given request.
/// \param request Pointer to a USBGenericRequest instance.
/// \return Endpoint number.
//------------------------------------------------------------------------------
unsigned char USBGenericRequest_GetEndpointNumber(
    const USBGenericRequest *request)
{
    return USBGenericRequest_GetIndex(request) & 0xF;
}

//------------------------------------------------------------------------------
/// Returns the intended recipient of a given request.
/// \param request Pointer to a USBGenericRequest instance.
/// \return Request recipient.
/// \sa "USB Request Recipients"
//------------------------------------------------------------------------------
unsigned char USBGenericRequest_GetRecipient(const USBGenericRequest *request)
{
    // Recipient is in bits [0..4] of the bmRequestType field
    return request->bmRequestType & 0xF;
}

//------------------------------------------------------------------------------
/// Returns the direction of the data transfer following the given request.
/// \param request Pointer to a USBGenericRequest instance.
/// \return Transfer direction.
/// \sa "USB Request Directions"
//------------------------------------------------------------------------------
unsigned char USBGenericRequest_GetDirection(const USBGenericRequest *request)
{
    // Transfer direction is located in bit D7 of the bmRequestType field
    if ((request->bmRequestType & 0x80) != 0) {

        return USBGenericRequest_IN;
    }
    else {

        return USBGenericRequest_OUT;
    }
}