nes-proj/cpu/cc2430/dev/watchdog-cc2430.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 used for the cc2430 watchdog timer.
*
* This file contains an ISR and must reside in the HOME bank.
*
* \author
* George Oikonomou - <oikonomou@users.sourceforge.net>
*/
#include "sys/energest.h"
#include "cc2430_sfr.h"
#include "contiki-conf.h"
#include "dev/watchdog-cc2430.h"
/*---------------------------------------------------------------------------*/
/* The watchdog only throws interrupts in timer mode */
#if WDT_TIMER_MODE
#pragma save
#if CC_CONF_OPTIMIZE_STACK_SIZE
#pragma exclude bits
#endif
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void
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cc4230_watchdog_ISR(void) __interrupt(WDT_VECTOR)
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{
EA = 0;
ENERGEST_ON(ENERGEST_TYPE_IRQ);
/* Do something */
IRCON2 &= ~WDTIF;
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
EA = 1;
}
#pragma restore
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#endif
/*---------------------------------------------------------------------------*/
void
watchdog_init(void)
{
WDCTL = WDT_TIMER_MODE | WDT_INTERVAL;
#if WDT_TIMER_MODE
/* Enable the watchdog interrupts in timer mode */
IEN2 |= WDTIE;
#endif
return;
}
/*---------------------------------------------------------------------------*/
void
watchdog_start(void)
{
WDCTL |= WDT_EN;
}
/*---------------------------------------------------------------------------*/
void
watchdog_periodic(void)
{
#if WDT_TIMER_MODE
/* In timer mode, all we need to do is write 1 to WDT:CLR[0] */
WDCTL |= WDT_CLR0;
#else
/* Write the 'clear' sequence while maintaining mode and interval setting */
WDCTL = (WDCTL & 0x0F) | WDT_CLR3 | WDT_CLR1;
WDCTL = (WDCTL & 0x0F) | WDT_CLR2 | WDT_CLR0;
#endif
}
/*---------------------------------------------------------------------------*/
void
watchdog_stop(void)
{
#if WDT_TIMER_MODE
/* In timer mode, the watchdog can actually be stopped */
WDCTL &= ~WDT_EN;
IRCON2 &= ~WDTIF;
#else
/* In watchdog mode, stopping is impossible so we just reset the timer */
watchdog_periodic();
#endif
}
/*---------------------------------------------------------------------------*/
void
watchdog_reboot(void)
{
#if WDT_TIMER_MODE
/* Switch modes to watchdog, minimum interval, enable */
WDCTL = WDT_EN | WDT_TIMEOUT_2_MSEC;
#else
/* Let's get this over with ASAP */
WDCTL = WDT_TIMEOUT_2_MSEC;
#endif
/* Dis-acknowledge all interrupts while we wait for the dog to bark */
DISABLE_INTERRUPTS();
/* NOP till the dog barks... */
while(1) {
__asm
nop
__endasm;
}
}