nes-proj/arch/platform/sky/node-id.c

72 lines
2.5 KiB
C

/*
* Copyright (c) 2006, Swedish Institute of Computer Science.
* 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.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* Utility to store a node id in the external flash
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "sys/node-id.h"
#include "contiki.h"
#include "dev/xmem.h"
unsigned short node_id = 0;
/*---------------------------------------------------------------------------*/
void
node_id_restore(void)
{
unsigned char buf[4];
xmem_pread(buf, 4, NODE_ID_XMEM_OFFSET);
if(buf[0] == 0xad &&
buf[1] == 0xde) {
node_id = (buf[2] << 8) | buf[3];
} else {
node_id = 0;
}
}
/*---------------------------------------------------------------------------*/
void
node_id_burn(unsigned short id)
{
unsigned char buf[4];
buf[0] = 0xad;
buf[1] = 0xde;
buf[2] = id >> 8;
buf[3] = id & 0xff;
xmem_erase(XMEM_ERASE_UNIT_SIZE, NODE_ID_XMEM_OFFSET);
xmem_pwrite(buf, 4, NODE_ID_XMEM_OFFSET);
}
/*---------------------------------------------------------------------------*/