platform/sky/node-id.c

   1 /*
   2  * Copyright (c) 2006, Swedish Institute of Computer Science.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the Institute nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * This file is part of the Contiki operating system.
  30  *
  31  * $Id: node-id.c,v 1.1 2007/03/23 09:59:08 nifi Exp $
  32  */
  33
  34 /**
  35  * \file
  36  *         Utility to store a node id in the external flash
  37  * \author
  38  *         Adam Dunkels <adam@sics.se>
  39  */
  40
  41 #include "node-id.h"
  42 #include "contiki-conf.h"
  43 #include "dev/xmem.h"
  44
  45 unsigned short node_id = 0;
  46
  47 /*---------------------------------------------------------------------------*/
  48 void
  49 node_id_restore(void)
  50 {
  51   unsigned char buf[4];
  52   xmem_pread(buf, 4, NODE_ID_XMEM_OFFSET);
  53   if(buf[0] == 0xad &&
  54      buf[1] == 0xde) {
  55     node_id = (buf[2] << 8) | buf[3];
  56   } else {
  57     node_id = 0;
  58   }
  59 }
  60 /*---------------------------------------------------------------------------*/
  61 void
  62 node_id_burn(unsigned short id)
  63 {
  64   unsigned char buf[4];
  65   buf[0] = 0xad;
  66   buf[1] = 0xde;
  67   buf[2] = id >> 8;
  68   buf[3] = id & 0xff;
  69   xmem_erase(XMEM_ERASE_UNIT_SIZE, NODE_ID_XMEM_OFFSET);
  70   xmem_pwrite(buf, 4, NODE_ID_XMEM_OFFSET);
  71 }
  72 /*---------------------------------------------------------------------------*/