nes-proj/arch/cpu/cc26xx-cc13xx/dev/contiki-watchdog.c

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/*
* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
* 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 copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
/**
* \addtogroup cc26xx-clocks
* @{
*
* \defgroup cc26xx-wdt CC13xx/CC26xx watchdog timer driver
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*
* Driver for the CC13xx/CC26xx Watchdog Timer
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*
* This file is not called watchdog.c because the filename is in use by
* TI CC26xxware/CC13xxware
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* @{
*
* \file
* Implementation of the CC13xx/CC26xx watchdog driver.
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*/
#include "contiki.h"
#include "dev/watchdog.h"
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#include "ti-lib.h"
#include <stdbool.h>
#include <stdint.h>
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/*---------------------------------------------------------------------------*/
#ifdef CONTIKI_WATCHDOG_CONF_TIMER_TOP
#define CONTIKI_WATCHDOG_TIMER_TOP CONTIKI_WATCHDOG_CONF_TIMER_TOP
#else
#define CONTIKI_WATCHDOG_TIMER_TOP 0xFFFFF
#endif
#ifdef CONTIKI_WATCHDOG_CONF_LOCK_CONFIG
#define CONTIKI_WATCHDOG_LOCK_CONFIG CONTIKI_WATCHDOG_CONF_LOCK_CONFIG
#else
#define CONTIKI_WATCHDOG_LOCK_CONFIG 1
#endif
#define LOCK_INTERRUPTS_DISABLED 0x01
#define LOCK_REGISTERS_UNLOCKED 0x02
/*---------------------------------------------------------------------------*/
static uint32_t
unlock_config(void)
{
uint32_t ret = 0;
bool int_status;
if(CONTIKI_WATCHDOG_LOCK_CONFIG) {
int_status = ti_lib_int_master_disable();
if(ti_lib_watchdog_lock_state()) {
ret |= LOCK_REGISTERS_UNLOCKED;
ti_lib_watchdog_unlock();
}
ret |= (int_status) ? (0) : (LOCK_INTERRUPTS_DISABLED);
}
return ret;
}
/*---------------------------------------------------------------------------*/
static void
lock_config(uint32_t status)
{
if(CONTIKI_WATCHDOG_LOCK_CONFIG) {
if(status & LOCK_REGISTERS_UNLOCKED) {
ti_lib_watchdog_lock();
}
if(status & LOCK_INTERRUPTS_DISABLED) {
ti_lib_int_master_enable();
}
}
}
/*---------------------------------------------------------------------------*/
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/**
* \brief Initialises the CC26xx WDT
*
* Simply sets the reload counter to a default value. The WDT is not started
* yet. To start it, watchdog_start() must be called.
*/
void
watchdog_init(void)
{
ti_lib_watchdog_reload_set(CONTIKI_WATCHDOG_TIMER_TOP);
lock_config(LOCK_REGISTERS_UNLOCKED);
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}
/*---------------------------------------------------------------------------*/
/**
* \brief Starts the CC26xx WDT
*/
void
watchdog_start(void)
{
uint32_t lock_status = unlock_config();
watchdog_periodic();
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ti_lib_watchdog_reset_enable();
lock_config(lock_status);
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}
/*---------------------------------------------------------------------------*/
/**
* \brief Refreshes the CC26xx WDT
*/
void
watchdog_periodic(void)
{
ti_lib_watchdog_reload_set(CONTIKI_WATCHDOG_TIMER_TOP);
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ti_lib_watchdog_int_clear();
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}
/*---------------------------------------------------------------------------*/
/**
* \brief Stops the WDT such that it won't timeout and cause MCU reset
*/
void
watchdog_stop(void)
{
uint32_t lock_status = unlock_config();
ti_lib_watchdog_reset_disable();
lock_config(lock_status);
}
/*---------------------------------------------------------------------------*/
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/**
* \brief Manually trigger a WDT reboot
*/
void
watchdog_reboot(void)
{
watchdog_start();
while(1);
}
/*---------------------------------------------------------------------------*/
/**
* @}
* @}
*/