usbendpointdescriptor.c

Atmel的AT91SAM7x256芯片的usb存储的源程序

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/*
    Title: USBEndpointDescriptor implementation

    About: Purpose
        Implementation of the USBEndpointDescriptor class.
*/

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

#include "USBEndpointDescriptor.h"

//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------
/*
    Function: USBEndpointDescriptor_GetNumber
        Returns the number of an endpoint given its descriptor.

    Parameters:
        endpoint - Pointer to a USBEndpointDescriptor instance.

    Returns:
        Endpoint number.
*/
unsigned char USBEndpointDescriptor_GetNumber(
    const USBEndpointDescriptor *endpoint)
{
    return endpoint->bEndpointAddress & 0xF;
}

/*
    Function: USBEndpointDescriptor_GetDirection
        Returns the direction of an endpoint given its descriptor.

    Parameters:
        endpoint - Pointer to a USBEndpointDescriptor instance.

    Returns:
        Endpoint direction (see <Endpoint directions>).
*/
unsigned char USBEndpointDescriptor_GetDirection(
    const USBEndpointDescriptor *endpoint)
{
    if ((endpoint->bEndpointAddress & 0x80) != 0) {

        return USBEndpointDescriptor_IN;
    }
    else {

        return USBEndpointDescriptor_OUT;
    }
}

/*
    Function: USBEndpointDescriptor_GetType
        Returns the type of an endpoint given its descriptor.

    Parameters:
        endpoint - Pointer to a USBEndpointDescriptor instance.

    Returns:
        Endpoint type (see <Endpoint types>).
*/
unsigned char USBEndpointDescriptor_GetType(
    const USBEndpointDescriptor *endpoint)
{
    return endpoint->bmAttributes & 0x3;
}

/*
    Function: USBEndpointDescriptor_GetMaxPacketSize
        Returns the maximum size of a packet (in bytes) on an endpoint given
        its descriptor.

    Parameters:
        endpoint - Pointer to a USBEndpointDescriptor instance.

    Returns:
        Maximum packet size of endpoint.
*/
unsigned short USBEndpointDescriptor_GetMaxPacketSize(
    const USBEndpointDescriptor *endpoint)
{
    return endpoint->wMaxPacketSize;
}