nes-proj/cpu/cc253x/dev/watchdog.c

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/*
* Copyright (c) 2010, Loughborough University - 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
* Hardware-dependent functions for the cc253x watchdog.
*
* This file contains an ISR and must reside in the HOME bank.
*
* \author
* George Oikonomou - <oikonomou@users.sourceforge.net>
*/
#include "cc253x.h"
#include "sfr-bits.h"
#include "contiki-conf.h"
#define WDT_TIMEOUT_MIN (WDCTL_INT1 | WDCTL_INT0)
/*---------------------------------------------------------------------------*/
void
watchdog_init(void)
{
WDCTL = 0; /* IDLE, Max Interval */
}
/*---------------------------------------------------------------------------*/
void
watchdog_start(void)
{
WDCTL |= WDCTL_MODE1; /* Start in Watchdog mode */
}
/*---------------------------------------------------------------------------*/
void
watchdog_periodic(void)
{
/* Write the 'clear' sequence while maintaining mode and interval setting */
WDCTL = (WDCTL & 0x0F) | WDCTL_CLR3 | WDCTL_CLR1;
WDCTL = (WDCTL & 0x0F) | WDCTL_CLR2 | WDCTL_CLR0;
}
/*---------------------------------------------------------------------------*/
void
watchdog_reboot(void)
{
WDCTL = WDT_TIMEOUT_MIN;
/* Dis-acknowledge all interrupts while we wait for the dog to bark */
DISABLE_INTERRUPTS();
WDCTL |= WDCTL_MODE1; /* Just in case it's not started... */
/* NOP till the dog barks... */
while(1) {
ASM(nop);
}
}