80 lines
2.9 KiB
C
80 lines
2.9 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: watchdog.c,v 1.5 2008/02/11 10:45:19 adamdunkels Exp $
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*/
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#include <io.h>
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#include "dev/watchdog.h"
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static int stopped = 0;
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/*---------------------------------------------------------------------------*/
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void
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watchdog_init(void)
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{
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/* The MSP430 watchdog is enabled at boot-up, so we stop it during
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initialization. */
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stopped = 0;
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watchdog_stop();
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}
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/*---------------------------------------------------------------------------*/
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void
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watchdog_start(void)
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{
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/* We setup the watchdog to reset the device after one second,
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unless watchdog_periodic() is called. */
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stopped--;
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if(!stopped) {
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WDTCTL = WDTPW | WDTCNTCL | WDT_ARST_1000;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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watchdog_periodic(void)
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{
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/* This function is called periodically to restart the watchdog
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timer. */
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if(!stopped) {
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WDTCTL = (WDTCTL & 0xff) | WDTPW | WDTCNTCL;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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watchdog_stop(void)
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{
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WDTCTL = WDTPW | WDTHOLD;
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stopped++;
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}
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/*---------------------------------------------------------------------------*/
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void
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watchdog_reboot(void)
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{
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WDTCTL = 0;
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}
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/*---------------------------------------------------------------------------*/
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