iwdg.c
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/****************************************************************************
*
* Copyright (c) 2021 PX4 Development Team. All rights reserved.
* Author: David Sidrane <david.sidrane@nscdg.com>
*
* 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 PX4 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 OWNER 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.
*
****************************************************************************/
#include <nuttx/config.h>
#include "arm_internal.h"
#include "arm_arch.h"
#include "chip.h"
#include "nvic.h"
#include "stm32_wdg.h"
/****************************************************************************
* Name: watchdog_pet()
*
* Description:
* This function resets the Independent watchdog (IWDG)
*
*
* Input Parameters:
* none.
*
* Returned value:
* none.
*
****************************************************************************/
void watchdog_pet(void)
{
putreg32(IWDG_KR_KEY_RELOAD, STM32_IWDG_KR);
}
/****************************************************************************
* Name: watchdog_init()
*
* Description:
* This function initialize the Independent watchdog (IWDG)
*
*
* Input Parameters:
* none.
*
* Returned value:
* none.
*
****************************************************************************/
void watchdog_init(void)
{
#if defined(CONFIG_STM32F7_JTAG_FULL_ENABLE) || \
defined(CONFIG_STM32F7_JTAG_NOJNTRST_ENABLE) || \
defined(CONFIG_STM32F7_JTAG_SW_ENABLE)
putreg32(getreg32(STM32_DBGMCU_APB1_FZ) | DBGMCU_APB1_IWDGSTOP, STM32_DBGMCU_APB1_FZ);
#endif
/* unlock */
putreg32(IWDG_KR_KEY_ENABLE, STM32_IWDG_KR);
/* Set the prescale value */
putreg32(IWDG_PR_DIV16, STM32_IWDG_PR);
/* Set the reload value */
putreg32(IWDG_RLR_MAX, STM32_IWDG_RLR);
/* Start the watch dog */
putreg32(IWDG_KR_KEY_START, STM32_IWDG_KR);
watchdog_pet();
}