fde3202a3f
Added a mode, configurable by the CONTIKI_WATCHDOG_CONF_LOCK_BETWEEN_USE macro, which locks the WDT register between uses so as to prevent any accidental modifications
164 lines
4.7 KiB
C
164 lines
4.7 KiB
C
/*
|
|
* 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
|
|
*
|
|
* Driver for the CC13xx/CC26xx Watchdog Timer
|
|
*
|
|
* This file is not called watchdog.c because the filename is in use by
|
|
* TI CC26xxware/CC13xxware
|
|
* @{
|
|
*
|
|
* \file
|
|
* Implementation of the CC13xx/CC26xx watchdog driver.
|
|
*/
|
|
#include "contiki.h"
|
|
#include "dev/watchdog.h"
|
|
#include "ti-lib.h"
|
|
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
/*---------------------------------------------------------------------------*/
|
|
#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();
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* \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);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* \brief Starts the CC26xx WDT
|
|
*/
|
|
void
|
|
watchdog_start(void)
|
|
{
|
|
uint32_t lock_status = unlock_config();
|
|
|
|
watchdog_periodic();
|
|
ti_lib_watchdog_reset_enable();
|
|
|
|
lock_config(lock_status);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* \brief Refreshes the CC26xx WDT
|
|
*/
|
|
void
|
|
watchdog_periodic(void)
|
|
{
|
|
ti_lib_watchdog_reload_set(CONTIKI_WATCHDOG_TIMER_TOP);
|
|
ti_lib_watchdog_int_clear();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* \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);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* \brief Manually trigger a WDT reboot
|
|
*/
|
|
void
|
|
watchdog_reboot(void)
|
|
{
|
|
watchdog_start();
|
|
while(1);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* @}
|
|
* @}
|
|
*/
|