Contiki 2.6

node-id.c

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00001 /*
00002  * Copyright (c) 2006, Swedish Institute of Computer Science.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * This file is part of the Contiki operating system.
00030  *
00031  * $Id: node-id.c,v 1.1 2007/03/23 09:59:08 nifi Exp $
00032  */
00033 
00034 /**
00035  * \file
00036  *         Utility to store a node id in the external flash
00037  * \author
00038  *         Adam Dunkels <adam@sics.se>
00039  */
00040 
00041 #include "node-id.h"
00042 #include "contiki-conf.h"
00043 #include "dev/xmem.h"
00044 
00045 unsigned short node_id = 0;
00046 
00047 /*---------------------------------------------------------------------------*/
00048 void
00049 node_id_restore(void)
00050 {
00051   unsigned char buf[4];
00052   xmem_pread(buf, 4, NODE_ID_XMEM_OFFSET);
00053   if(buf[0] == 0xad &&
00054      buf[1] == 0xde) {
00055     node_id = (buf[2] << 8) | buf[3];
00056   } else {
00057     node_id = 0;
00058   }
00059 }
00060 /*---------------------------------------------------------------------------*/
00061 void
00062 node_id_burn(unsigned short id)
00063 {
00064   unsigned char buf[4];
00065   buf[0] = 0xad;
00066   buf[1] = 0xde;
00067   buf[2] = id >> 8;
00068   buf[3] = id & 0xff;
00069   xmem_erase(XMEM_ERASE_UNIT_SIZE, NODE_ID_XMEM_OFFSET);
00070   xmem_pwrite(buf, 4, NODE_ID_XMEM_OFFSET);
00071 }
00072 /*---------------------------------------------------------------------------*/