140 lines
4.4 KiB
C
140 lines
4.4 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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*/
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/* Watchdog routines for the AVR */
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/* The default timeout of 2 seconds works on most MCUs.
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* It should be disabled during sleep (unless used for wakeup) since
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* it draws significant current (~5 uamp on 1284p, 20x the MCU consumption).
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*
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* Note the wdt is not properly simulated in AVR Studio 4 Simulator 1:
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* On many devices calls to wdt_reset will have no effect, and a wdt reboot will occur.
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* The MCUSR will not show the cause of a wdt reboot.
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* A 1MHz clock is assumed; at 8MHz timeout occurs 8x faster than it should.
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* Simulator 2 is supposed to work on supported devices (not atmega128rfa1),
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* but neither it nor Studio 5 beta do any resets on the 1284p.
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*
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* Setting WATCHDOG_CONF_TIMEOUT -1 will disable the WDT.
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*/
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//#define WATCHDOG_CONF_TIMEOUT -1
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#ifndef WATCHDOG_CONF_TIMEOUT
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#define WATCHDOG_CONF_TIMEOUT WDTO_2S
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#endif
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/* While balancing start and stop calls is a good idea, an imbalance will cause
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* resets that can take a lot of time to track down.
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* Some low power protocols may cause this.
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* The default is no balance; define WATCHDOG_CONF_BALANCE 1 to override.
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*/
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#ifndef WATCHDOG_CONF_BALANCE
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#define WATCHDOG_CONF_BALANCE 0
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#endif
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#include "dev/watchdog.h"
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#include <avr/wdt.h>
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#include <avr/interrupt.h>
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/* MCUSR is a deprecated name but older avr-libc versions may define it */
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#if !defined (MCUCSR)
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# if defined (MCUSR)
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# define MCUCSR MCUSR
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# endif
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#endif
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#if WATCHDOG_CONF_BALANCE && WATCHDOG_CONF_TIMEOUT >= 0
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static int stopped = 0;
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#endif
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/*---------------------------------------------------------------------------*/
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void
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watchdog_init(void)
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{
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/* Clear startup bit and disable the wdt, whether or not it will be used.
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Random code may have caused the last reset.
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*/
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MCUCSR&=~(1<<WDRF);
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wdt_disable();
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#if WATCHDOG_CONF_BALANCE && WATCHDOG_CONF_TIMEOUT >= 0
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stopped = 1;
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#endif
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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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#if WATCHDOG_CONF_TIMEOUT >= 0
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#if WATCHDOG_CONF_BALANCE
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stopped--;
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if(!stopped)
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#endif
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wdt_enable(WATCHDOG_CONF_TIMEOUT);
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#endif
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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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#if WATCHDOG_CONF_TIMEOUT >= 0
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#if WATCHDOG_CONF_BALANCE
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if(!stopped)
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#endif
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wdt_reset();
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#endif
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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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#if WATCHDOG_CONF_TIMEOUT >= 0
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#if WATCHDOG_CONF_BALANCE
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stopped++;
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#endif
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wdt_disable();
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#endif
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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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cli();
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wdt_enable(WDTO_15MS); //wd on,250ms
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while(1); //loop
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}
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/*---------------------------------------------------------------------------*/
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#if 0
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/* Not all AVRs implement the wdt interrupt */
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ISR(WDT_vect)
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{
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}
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#endif
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