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281 lines
10 KiB
281 lines
10 KiB
7 years ago
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/**
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******************************************************************************
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* @file stm32l0xx_hal_iwdg.c
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* @author MCD Application Team
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* @brief IWDG HAL module driver.
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* This file provides firmware functions to manage the following
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* functionalities of the Independent Watchdog (IWDG) peripheral:
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* + Initialization and Start functions
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* + IO operation functions
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*
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@verbatim
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==============================================================================
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##### IWDG Generic features #####
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==============================================================================
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[..]
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(+) The IWDG can be started by either software or hardware (configurable
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through option byte).
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(+) The IWDG is clocked by Low-Speed clock (LSI) and thus stays active even
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if the main clock fails.
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(+) Once the IWDG is started, the LSI is forced ON and both can not be
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disabled. The counter starts counting down from the reset value (0xFFF).
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When it reaches the end of count value (0x000) a reset signal is
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generated (IWDG reset).
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(+) Whenever the key value 0x0000 AAAA is written in the IWDG_KR register,
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the IWDG_RLR value is reloaded in the counter and the watchdog reset is
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prevented.
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(+) The IWDG is implemented in the VDD voltage domain that is still functional
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in STOP and STANDBY mode (IWDG reset can wake-up from STANDBY).
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IWDGRST flag in RCC_CSR register can be used to inform when an IWDG
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reset occurs.
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(+) Debug mode : When the microcontroller enters debug mode (core halted),
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the IWDG counter either continues to work normally or stops, depending
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on DBG_IWDG_STOP configuration bit in DBG module, accessible through
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__HAL_DBGMCU_FREEZE_IWDG() and __HAL_DBGMCU_UNFREEZE_IWDG() macros
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[..] Min-max timeout value @32KHz (LSI): ~0.512ms / ~32.0s
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The IWDG timeout may vary due to LSI frequency dispersion. STM32L0xx
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devices provide the capability to measure the LSI frequency (LSI clock
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connected internally to TIM5 CH4 input capture). The measured value
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can be used to have an IWDG timeout with an acceptable accuracy.
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##### How to use this driver #####
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==============================================================================
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[..]
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(#) Use IWDG using HAL_IWDG_Init() function to :
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(++) Enable instance by writing Start keyword in IWDG_KEY register. LSI
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clock is forced ON and IWDG counter starts downcounting.
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(++) Enable write access to configuration register: IWDG_PR, IWDG_RLR &
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IWDG_WINR.
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(++) Configure the IWDG prescaler and counter reload value. This reload
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value will be loaded in the IWDG counter each time the watchdog is
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reloaded, then the IWDG will start counting down from this value.
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(++) Wait for status flags to be reset
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(++) Depending on window parameter:
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(+++) If Window Init parameter is same as Window register value,
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nothing more is done but reload counter value in order to exit
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function withy exact time base.
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(+++) Else modify Window register. This will automatically reload
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watchdog counter.
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(#) Then the application program must refresh the IWDG counter at regular
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intervals during normal operation to prevent an MCU reset, using
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HAL_IWDG_Refresh() function.
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*** IWDG HAL driver macros list ***
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====================================
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[..]
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Below the list of most used macros in IWDG HAL driver:
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(+) __HAL_IWDG_START: Enable the IWDG peripheral
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(+) __HAL_IWDG_RELOAD_COUNTER: Reloads IWDG counter with value defined in
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the reload register
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@endverbatim
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32l0xx_hal.h"
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/** @addtogroup STM32L0xx_HAL_Driver
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* @{
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*/
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#ifdef HAL_IWDG_MODULE_ENABLED
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/** @addtogroup IWDG
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* @brief IWDG HAL module driver.
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/** @defgroup IWDG_Private_Defines IWDG Private Defines
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* @{
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*/
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/* Status register need 5 RC LSI divided by prescaler clock to be updated. With
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higher prescaler (256), and according to LSI variation, we need to wait at
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least 6 cycles so 48 ms. */
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#define HAL_IWDG_DEFAULT_TIMEOUT 48U
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/**
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* @}
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*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Exported functions --------------------------------------------------------*/
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/** @addtogroup IWDG_Exported_Functions
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* @{
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*/
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/** @addtogroup IWDG_Exported_Functions_Group1
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* @brief Initialization and Start functions.
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*
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@verbatim
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===============================================================================
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##### Initialization and Start functions #####
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===============================================================================
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[..] This section provides functions allowing to:
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(+) Initialize the IWDG according to the specified parameters in the
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IWDG_InitTypeDef of associated handle.
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(+) Manage Window option.
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(+) Once initialization is performed in HAL_IWDG_Init function, Watchdog
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is reloaded in order to exit function with correct time base.
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@endverbatim
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* @{
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*/
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/**
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* @brief Initialize the IWDG according to the specified parameters in the
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* IWDG_InitTypeDef and start watchdog. Before exiting function,
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* watchdog is refreshed in order to have correct time base.
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* @param hiwdg pointer to a IWDG_HandleTypeDef structure that contains
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* the configuration information for the specified IWDG module.
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_IWDG_Init(IWDG_HandleTypeDef *hiwdg)
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{
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uint32_t tickstart;
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/* Check the IWDG handle allocation */
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if(hiwdg == NULL)
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{
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return HAL_ERROR;
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}
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/* Check the parameters */
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assert_param(IS_IWDG_ALL_INSTANCE(hiwdg->Instance));
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assert_param(IS_IWDG_PRESCALER(hiwdg->Init.Prescaler));
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assert_param(IS_IWDG_RELOAD(hiwdg->Init.Reload));
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assert_param(IS_IWDG_WINDOW(hiwdg->Init.Window));
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/* Enable IWDG. LSI is turned on automaticaly */
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__HAL_IWDG_START(hiwdg);
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/* Enable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers by writing
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0x5555 in KR */
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IWDG_ENABLE_WRITE_ACCESS(hiwdg);
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/* Write to IWDG registers the Prescaler & Reload values to work with */
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hiwdg->Instance->PR = hiwdg->Init.Prescaler;
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hiwdg->Instance->RLR = hiwdg->Init.Reload;
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/* Check pending flag, if previous update not done, return timeout */
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tickstart = HAL_GetTick();
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/* Wait for register to be updated */
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while(hiwdg->Instance->SR != RESET)
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{
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if((HAL_GetTick() - tickstart ) > HAL_IWDG_DEFAULT_TIMEOUT)
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{
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return HAL_TIMEOUT;
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}
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}
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/* If window parameter is different than current value, modify window
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register */
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if(hiwdg->Instance->WINR != hiwdg->Init.Window)
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{
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/* Write to IWDG WINR the IWDG_Window value to compare with. In any case,
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even if window feature is disabled, Watchdog will be reloaded by writing
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windows register */
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hiwdg->Instance->WINR = hiwdg->Init.Window;
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}
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else
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{
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/* Reload IWDG counter with value defined in the reload register */
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__HAL_IWDG_RELOAD_COUNTER(hiwdg);
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}
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/* Return function status */
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return HAL_OK;
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}
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/**
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* @}
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*/
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/** @addtogroup IWDG_Exported_Functions_Group2
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* @brief IO operation functions
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*
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@verbatim
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===============================================================================
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##### IO operation functions #####
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===============================================================================
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[..] This section provides functions allowing to:
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(+) Refresh the IWDG.
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@endverbatim
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* @{
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*/
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/**
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* @brief Refresh the IWDG.
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* @param hiwdg pointer to a IWDG_HandleTypeDef structure that contains
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* the configuration information for the specified IWDG module.
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_IWDG_Refresh(IWDG_HandleTypeDef *hiwdg)
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{
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/* Reload IWDG counter with value defined in the reload register */
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__HAL_IWDG_RELOAD_COUNTER(hiwdg);
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/* Return function status */
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return HAL_OK;
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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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*/
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#endif /* HAL_IWDG_MODULE_ENABLED */
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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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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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