89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
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/*
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* Copyright (c) 2010, Loughborough University - 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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* \file
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* Hardware-dependent functions for the cc253x watchdog.
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*
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* This file contains an ISR and must reside in the HOME bank.
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*
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* \author
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* George Oikonomou - <oikonomou@users.sourceforge.net>
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*/
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#include "sys/energest.h"
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#include "cc253x.h"
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#include "sfr-bits.h"
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#include "contiki-conf.h"
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#define WDT_TIMEOUT_MIN (WDCTL_INT1 | WDCTL_INT0)
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/*---------------------------------------------------------------------------*/
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void
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watchdog_init(void)
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{
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WDCTL = 0; /* IDLE, Max Interval */
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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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WDCTL |= WDCTL_MODE1; /* Start in Watchdog mode */
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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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/* Write the 'clear' sequence while maintaining mode and interval setting */
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WDCTL = (WDCTL & 0x0F) | WDCTL_CLR3 | WDCTL_CLR1;
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WDCTL = (WDCTL & 0x0F) | WDCTL_CLR2 | WDCTL_CLR0;
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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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/* In watchdog mode, stopping is impossible so we just reset the timer */
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watchdog_periodic();
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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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WDCTL = WDT_TIMEOUT_MIN;
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/* Dis-acknowledge all interrupts while we wait for the dog to bark */
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DISABLE_INTERRUPTS();
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/* NOP till the dog barks... */
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while(1) {
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__asm
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nop
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__endasm;
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}
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}
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