nes-proj/cpu/avr/watchdog.c

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/*
* Copyright (c) 2005, 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.
*
* @(#)$Id: watchdog.c,v 1.2 2010/09/17 21:59:09 dak664 Exp $
*/
/* Dummy watchdog routines for the Raven 1284p */
#include "dev/watchdog.h"
#include <avr/wdt.h>
#include <avr/interrupt.h>
static int stopped = 0;
/*---------------------------------------------------------------------------*/
void
watchdog_init(void)
{
MCUSR&=~(1<<WDRF);
stopped = 0;
watchdog_stop();
}
/*---------------------------------------------------------------------------*/
void
watchdog_start(void)
{
stopped--;
if(!stopped)
wdt_enable(WDTO_2S);
}
/*---------------------------------------------------------------------------*/
void
watchdog_periodic(void)
{
if(!stopped)
wdt_reset();
}
/*---------------------------------------------------------------------------*/
void
watchdog_stop(void)
{
stopped++;
wdt_disable();
}
/*---------------------------------------------------------------------------*/
void
watchdog_reboot(void)
{
cli();
wdt_enable(WDTO_15MS); //wd on,250ms
while(1); //loop
}
/*---------------------------------------------------------------------------*/