129 lines
4 KiB
C
129 lines
4 KiB
C
/*
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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 used for the cc2430 watchdog timer.
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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 "cc2430_sfr.h"
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#include "contiki-conf.h"
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#include "dev/watchdog-cc2430.h"
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/*---------------------------------------------------------------------------*/
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/* The watchdog only throws interrupts in timer mode */
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#if WDT_TIMER_MODE
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#pragma save
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#if CC_CONF_OPTIMIZE_STACK_SIZE
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#pragma exclude bits
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#endif
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void
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cc4230_watchdog_ISR(void) __interrupt(WDT_VECTOR)
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{
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EA = 0;
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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/* Do something */
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IRCON2 &= ~WDTIF;
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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EA = 1;
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}
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#pragma restore
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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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WDCTL = WDT_TIMER_MODE | WDT_INTERVAL;
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#if WDT_TIMER_MODE
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/* Enable the watchdog interrupts in timer mode */
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IEN2 |= WDTIE;
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#endif
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return;
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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 |= WDT_EN;
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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 WDT_TIMER_MODE
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/* In timer mode, all we need to do is write 1 to WDT:CLR[0] */
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WDCTL |= WDT_CLR0;
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#else
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/* Write the 'clear' sequence while maintaining mode and interval setting */
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WDCTL = (WDCTL & 0x0F) | WDT_CLR3 | WDT_CLR1;
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WDCTL = (WDCTL & 0x0F) | WDT_CLR2 | WDT_CLR0;
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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 WDT_TIMER_MODE
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/* In timer mode, the watchdog can actually be stopped */
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WDCTL &= ~WDT_EN;
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IRCON2 &= ~WDTIF;
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#else
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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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#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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#if WDT_TIMER_MODE
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/* Switch modes to watchdog, minimum interval, enable */
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WDCTL = WDT_EN | WDT_TIMEOUT_2_MSEC;
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#else
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/* Let's get this over with ASAP */
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WDCTL = WDT_TIMEOUT_2_MSEC;
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#endif
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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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