usbgenericrequest.c

AT91SAM9263的USB Device端口驱动

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

    About: Purpose
        Implementation of the USBGenericRequest class.
*/

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

#include "USBGenericRequest.h"

//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------
/*
    Function: USBGenericRequest_GetType
        Returns the type of the given request.

    Parameters:
        request - Pointer to a USBGenericRequest instance.

    Returns:
        Request type.

    See also:
        <Types>.
*/
extern unsigned char USBGenericRequest_GetType(const USBGenericRequest *request)
{
    return ((request->bmRequestType >> 5) & 0x3);
}

/*
    Function: USBGenericRequest_GetRequest
        Returns the request code of the given request.

    Parameters:
        request - Pointer to a USBGenericRequest instance.

    Returns:
        Request code.
*/
unsigned char USBGenericRequest_GetRequest(const USBGenericRequest *request)
{
    return request->bRequest;
}

/*
    Function: USBGenericRequest_GetValue
        Returns the wValue field of the given request.

    Parameters:
        request - Pointer to a USBGenericRequest instance.

    Returns:
        Request value.
*/
unsigned short USBGenericRequest_GetValue(const USBGenericRequest *request)
{
    return request->wValue;
}

/*
    Function: USBGenericRequest_GetIndex
        Returns the wIndex field of the given request.

    Parameters:
        request - Pointer to a USBGenericRequest instance.

    Returns:
        Request index;
*/
unsigned short USBGenericRequest_GetIndex(const USBGenericRequest *request)
{
    return request->wIndex;
}

/*
    Function: USBGenericRequest_GetLength
        Returns the expected length of the data phase following a request.

    Parameters:
        request - Pointer to a USBGenericRequest instance.

    Returns:
        Length of data phase.
*/
unsigned short USBGenericRequest_GetLength(const USBGenericRequest *request)
{
    return request->wLength;
}

/*
    Function: USBGenericRequest_GetEndpointNumber
        Returns the endpoint number targetted by a given request.

    Parameters:
        request - Pointer to a USBGenericRequest instance.

    Returns:
        Endpoint number.
*/
unsigned char USBGenericRequest_GetEndpointNumber(const USBGenericRequest *request)
{
    return USBGenericRequest_GetIndex(request) & 0xF;
}

/*
    Function: USBGenericRequest_GetRecipient
        Returns the intended recipient of a given request.

    Parameters:
        request - Pointer to a USBGenericRequest instance.

    Returns:
        Request recipient.
*/
unsigned char USBGenericRequest_GetRecipient(const USBGenericRequest *request)
{
    // Recipient is in bits [0..4] of the bmRequestType field
    return request->bmRequestType & 0xF;
}

/*
    Function: USBGenericRequest_GetDirection
        Returns the direction of the data transfer following the given request.

    Parameters:
        request - Pointer to a USBGenericRequest instance.

    Returns:
        Transfer direction.
*/
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;
    }
}