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97 lines
3.4 KiB
C
97 lines
3.4 KiB
C
/*
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* Copyright (c) 2012, Texas Instruments Incorporated - http://www.ti.com/
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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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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc2538
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* @{
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*
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* \defgroup cc2538-wdt cc2538 watchdog timer driver
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*
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* Driver for the cc2538 Watchdog Timer
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* @{
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*
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* \file
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* Implementation of the cc2538 watchdog driver. The peripheral runs in
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* watchdog mode.
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*/
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#include "contiki.h"
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#include "reg.h"
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#include "cpu.h"
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#include "dev/smwdthrosc.h"
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/*---------------------------------------------------------------------------*/
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/** \brief Initialisation function for the WDT. Currently simply explicitly
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* sets the WDT interval to max interval */
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void
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watchdog_init(void)
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{
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/* Max interval, don't enable yet */
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REG(SMWDTHROSC_WDCTL) = 0;
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}
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/*---------------------------------------------------------------------------*/
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/** \brief Starts the WDT in watchdog mode, maximum interval */
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void
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watchdog_start(void)
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{
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/* Max interval (32768), watchdog mode, Enable */
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REG(SMWDTHROSC_WDCTL) = SMWDTHROSC_WDCTL_EN;
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}
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/*---------------------------------------------------------------------------*/
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/** \brief Writes the WDT clear sequence. This function assumes that we are
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* in watchdog mode and that interval bits (bits [1:0]) are 00 */
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void
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watchdog_periodic(void)
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{
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/* Safe to write to bits [3:0] since EN is 1 */
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REG(SMWDTHROSC_WDCTL) = (SMWDTHROSC_WDCTL_CLR_3 | SMWDTHROSC_WDCTL_CLR_1);
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REG(SMWDTHROSC_WDCTL) = (SMWDTHROSC_WDCTL_CLR_2 | SMWDTHROSC_WDCTL_CLR_0);
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}
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/*---------------------------------------------------------------------------*/
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/** \brief In watchdog mode, the WDT can not be stopped. This function is
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* defined here to satisfy API requirements.
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*/
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void
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watchdog_stop(void)
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{
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return;
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}
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/*---------------------------------------------------------------------------*/
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/** \brief Keeps control until the WDT throws a reset signal */
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void
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watchdog_reboot(void)
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{
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INTERRUPTS_DISABLE();
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watchdog_start(); /* just in case the WDT hasn't been started yet */
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while(1);
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}
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/**
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* @}
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* @}
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*/
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