SAMV71 Xplained Ultra Software Package 1.5

MiniIp.c

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00001 /* ----------------------------------------------------------------------------
00002 *         SAM Software Package License
00003 * ----------------------------------------------------------------------------
00004 * Copyright (c) 2015, Atmel Corporation
00005 *
00006 * All rights reserved.
00007 *
00008 * Redistribution and use in source and binary forms, with or without
00009 * modification, are permitted provided that the following conditions are met:
00010 *
00011 * - Redistributions of source code must retain the above copyright notice,
00012 * this list of conditions and the disclaimer below.
00013 *
00014 * Atmel's name may not be used to endorse or promote products derived from
00015 * this software without specific prior written permission.
00016 *
00017 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
00018 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00019 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
00020 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
00021 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00022 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
00023 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00024 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00025 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
00026 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027 * ----------------------------------------------------------------------------
00028 */
00029 
00030 /** \file */
00031 /*---------------------------------------------------------------------------
00032  *      Headers
00033  *---------------------------------------------------------------------------*/
00034 
00035 #include "MiniIp.h"
00036 
00037 /*---------------------------------------------------------------------------
00038  *      Global functions
00039  *---------------------------------------------------------------------------*/
00040 
00041 /**
00042  * Process & return the ICMP checksum
00043  * \param p Pointer to the buffer to process
00044  * \param len The length of the buffered data
00045  */
00046 uint16_t IcmpChksum(uint16_t *p, uint32_t len)
00047 {
00048     uint32_t i, t;
00049 
00050     for (i = 0, t = 0; i < len; i++, p++)
00051         t += SWAP16(*p);
00052 
00053     t = (t & 0xffff) + (t >> 16);
00054     return (uint16_t)(~t);
00055 }
00056 
00057 
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