SAMV71 Xplained Ultra Software Package 1.3

MiniIp.c

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00001 /* ----------------------------------------------------------------------------
00002  *         SAM Software Package License 
00003  * ----------------------------------------------------------------------------
00004  * Copyright (c) 2014, 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 /** \file */
00030 /*---------------------------------------------------------------------------
00031  *      Headers
00032  *---------------------------------------------------------------------------*/
00033 
00034 #include "MiniIp.h"
00035 
00036 /*---------------------------------------------------------------------------
00037  *      Global functions
00038  *---------------------------------------------------------------------------*/
00039 
00040 /**
00041  * Process & return the ICMP checksum
00042  * \param p Pointer to the buffer to process
00043  * \param len The length of the buffered data
00044  */
00045 uint16_t IcmpChksum(uint16_t *p, uint32_t len)
00046 {
00047     uint32_t i, t;
00048 
00049     for (i = 0, t = 0; i < len; i++, p++) {
00050         t += SWAP16(*p);
00051     }
00052     t = (t & 0xffff) + (t >> 16);
00053     return (uint16_t)(~t);
00054 }
00055 
00056 
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