dfdb0a6487
According to the TRM, the WDT does not produce a reset until it expires twice. After expiring the WDT will set the INT flag if it is unset, and reset the MCU if INT is already set. Before this patch, watchdog_periodic() only un-sets the INT flag. This means that the behaviour of watchdog_periodic is underministic in that the value of the countdown timer will be different depending on when the function was called. This patch fixes this behaviour by also reloading the timout value.
100 lines
3.3 KiB
C
100 lines
3.3 KiB
C
/*
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* Copyright (c) 2014, 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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* 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 cc26xx-clocks
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* @{
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*
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* \defgroup cc26xx-wdt CC13xx/CC26xx watchdog timer driver
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*
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* Driver for the CC13xx/CC26xx Watchdog Timer
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*
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* This file is not called watchdog.c because the filename is in use by
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* TI CC26xxware/CC13xxware
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* @{
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*
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* \file
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* Implementation of the CC13xx/CC26xx watchdog driver.
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*/
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#include "contiki.h"
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#include "dev/watchdog.h"
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#include "ti-lib.h"
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/*---------------------------------------------------------------------------*/
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#ifdef CONTIKI_WATCHDOG_CONF_TIMER_TOP
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#define CONTIKI_WATCHDOG_TIMER_TOP CONTIKI_WATCHDOG_CONF_TIMER_TOP
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#else
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#define CONTIKI_WATCHDOG_TIMER_TOP 0xFFFFF
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#endif
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Initialises the CC26xx WDT
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*
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* Simply sets the reload counter to a default value. The WDT is not started
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* yet. To start it, watchdog_start() must be called.
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*/
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void
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watchdog_init(void)
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{
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ti_lib_watchdog_reload_set(CONTIKI_WATCHDOG_TIMER_TOP);
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Starts the CC26xx WDT
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*/
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void
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watchdog_start(void)
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{
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ti_lib_watchdog_reset_enable();
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Refreshes the CC26xx WDT
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*/
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void
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watchdog_periodic(void)
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{
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ti_lib_watchdog_reload_set(CONTIKI_WATCHDOG_TIMER_TOP);
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ti_lib_watchdog_int_clear();
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Manually trigger a WDT reboot
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*/
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void
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watchdog_reboot(void)
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{
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watchdog_start();
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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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*/
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