at90can_get_buf_message.c

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// ----------------------------------------------------------------------------
/*
 * Copyright (c) 2007 Fabian Greif, Roboterclub Aachen e.V.
 *  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: at90can_get_buf_message.c 6837 2008-11-16 19:05:15Z fabian $
 */
// ----------------------------------------------------------------------------
 
#include "at90can_private.h"
#include <string.h>
 
#if defined(SUPPORT_FOR_AT90CAN__) && CAN_RX_BUFFER_SIZE > 0
 
// ----------------------------------------------------------------------------
uint8_t at90can_get_buffered_message(can_t *msg)
{
        // get pointer to the first buffered message
        can_t *buf = can_buffer_get_dequeue_ptr(&can_rx_buffer);
        
        if (buf == NULL)
                return 0;
        
        // copy the message
        memcpy( msg, buf, sizeof(can_t) );
        
        // delete message from the queue
        can_buffer_dequeue(&can_rx_buffer);
        
        return 0xff;
}
 
#endif  // SUPPORT_FOR_AT90CAN__