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Diffstat (limited to 'bsps/arm/stm32h7/hal/stm32h7xx_hal_iwdg.c')
| -rw-r--r-- | bsps/arm/stm32h7/hal/stm32h7xx_hal_iwdg.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/bsps/arm/stm32h7/hal/stm32h7xx_hal_iwdg.c b/bsps/arm/stm32h7/hal/stm32h7xx_hal_iwdg.c new file mode 100644 index 0000000000..9947bf6a87 --- /dev/null +++ b/bsps/arm/stm32h7/hal/stm32h7xx_hal_iwdg.c @@ -0,0 +1,265 @@ +/**
+ ******************************************************************************
+ * @file stm32h7xx_hal_iwdg.c
+ * @author MCD Application Team
+ * @brief IWDG HAL module driver.
+ * This file provides firmware functions to manage the following
+ * functionalities of the Independent Watchdog (IWDG) peripheral:
+ * + Initialization and Start functions
+ * + IO operation functions
+ *
+ @verbatim
+ ==============================================================================
+ ##### IWDG Generic features #####
+ ==============================================================================
+ [..]
+ (+) The IWDG can be started by either software or hardware (configurable
+ through option byte).
+
+ (+) The IWDG is clocked by Low-Speed clock (LSI) and thus stays active even
+ if the main clock fails.
+
+ (+) Once the IWDG is started, the LSI is forced ON and both can not be
+ disabled. The counter starts counting down from the reset value (0xFFF).
+ When it reaches the end of count value (0x000) a reset signal is
+ generated (IWDG reset).
+
+ (+) Whenever the key value 0x0000 AAAA is written in the IWDG_KR register,
+ the IWDG_RLR value is reloaded in the counter and the watchdog reset is
+ prevented.
+
+ (+) The IWDG is implemented in the VDD voltage domain that is still functional
+ in STOP and STANDBY mode (IWDG reset can wake-up from STANDBY).
+ IWDGRST flag in RCC_CSR register can be used to inform when an IWDG
+ reset occurs.
+
+ (+) Debug mode : When the microcontroller enters debug mode (core halted),
+ the IWDG counter either continues to work normally or stops, depending
+ on DBG_IWDG_STOP configuration bit in DBG module, accessible through
+ __HAL_DBGMCU_FREEZE_IWDG1() or __HAL_DBGMCU_FREEZE2_IWDG2() and
+ __HAL_DBGMCU_UnFreeze_IWDG1 or __HAL_DBGMCU_UnFreeze2_IWDG2() macros.
+
+ [..] Min-max timeout value @32KHz (LSI): ~125us / ~32.7s
+ The IWDG timeout may vary due to LSI frequency dispersion. STM32H7xx
+ devices provide the capability to measure the LSI frequency (LSI clock
+ connected internally to TIM16 CH1 input capture). The measured value
+ can be used to have an IWDG timeout with an acceptable accuracy.
+
+ ##### How to use this driver #####
+ ==============================================================================
+ [..]
+ (#) Use IWDG using HAL_IWDG_Init() function to :
+ (++) Enable instance by writing Start keyword in IWDG_KEY register. LSI
+ clock is forced ON and IWDG counter starts counting down.
+ (++) Enable write access to configuration registers:
+ IWDG_PR, IWDG_RLR and IWDG_WINR.
+ (++) Configure the IWDG prescaler and counter reload value. This reload
+ value will be loaded in the IWDG counter each time the watchdog is
+ reloaded, then the IWDG will start counting down from this value.
+ (++) Wait for status flags to be reset.
+ (++) Depending on window parameter:
+ (+++) If Window Init parameter is same as Window register value,
+ nothing more is done but reload counter value in order to exit
+ function with exact time base.
+ (+++) Else modify Window register. This will automatically reload
+ watchdog counter.
+
+ (#) Then the application program must refresh the IWDG counter at regular
+ intervals during normal operation to prevent an MCU reset, using
+ HAL_IWDG_Refresh() function.
+
+ *** IWDG HAL driver macros list ***
+ ====================================
+ [..]
+ Below the list of most used macros in IWDG HAL driver:
+ (+) __HAL_IWDG_START: Enable the IWDG peripheral
+ (+) __HAL_IWDG_RELOAD_COUNTER: Reloads IWDG counter with value defined in
+ the reload register
+
+ @endverbatim
+ ******************************************************************************
+ * @attention
+ *
+ * <h2><center>© Copyright (c) 2017 STMicroelectronics.
+ * All rights reserved.</center></h2>
+ *
+ * This software component is licensed by ST under BSD 3-Clause license,
+ * the "License"; You may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ * opensource.org/licenses/BSD-3-Clause
+ *
+ ******************************************************************************
+ */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32h7xx_hal.h"
+
+/** @addtogroup STM32H7xx_HAL_Driver
+ * @{
+ */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+/** @addtogroup IWDG
+ * @brief IWDG HAL module driver.
+ * @{
+ */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/** @defgroup IWDG_Private_Defines IWDG Private Defines
+ * @{
+ */
+/* Status register need 5 RC LSI divided by prescaler clock to be updated. With
+ higher prescaler (256), and according to LSI variation, we need to wait at
+ least 6 cycles so 48 ms. */
+#define HAL_IWDG_DEFAULT_TIMEOUT 48u
+/**
+ * @}
+ */
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Exported functions --------------------------------------------------------*/
+
+/** @addtogroup IWDG_Exported_Functions
+ * @{
+ */
+
+/** @addtogroup IWDG_Exported_Functions_Group1
+ * @brief Initialization and Start functions.
+ *
+@verbatim
+ ===============================================================================
+ ##### Initialization and Start functions #####
+ ===============================================================================
+ [..] This section provides functions allowing to:
+ (+) Initialize the IWDG according to the specified parameters in the
+ IWDG_InitTypeDef of associated handle.
+ (+) Manage Window option.
+ (+) Once initialization is performed in HAL_IWDG_Init function, Watchdog
+ is reloaded in order to exit function with correct time base.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Initialize the IWDG according to the specified parameters in the
+ * IWDG_InitTypeDef and start watchdog. Before exiting function,
+ * watchdog is refreshed in order to have correct time base.
+ * @param hiwdg pointer to a IWDG_HandleTypeDef structure that contains
+ * the configuration information for the specified IWDG module.
+ * @retval HAL status
+ */
+HAL_StatusTypeDef HAL_IWDG_Init(IWDG_HandleTypeDef *hiwdg)
+{
+ uint32_t tickstart;
+
+ /* Check the IWDG handle allocation */
+ if (hiwdg == NULL)
+ {
+ return HAL_ERROR;
+ }
+
+ /* Check the parameters */
+ assert_param(IS_IWDG_ALL_INSTANCE(hiwdg->Instance));
+ assert_param(IS_IWDG_PRESCALER(hiwdg->Init.Prescaler));
+ assert_param(IS_IWDG_RELOAD(hiwdg->Init.Reload));
+ assert_param(IS_IWDG_WINDOW(hiwdg->Init.Window));
+
+ /* Enable IWDG. LSI is turned on automatically */
+ __HAL_IWDG_START(hiwdg);
+
+ /* Enable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers by writing
+ 0x5555 in KR */
+ IWDG_ENABLE_WRITE_ACCESS(hiwdg);
+
+ /* Write to IWDG registers the Prescaler & Reload values to work with */
+ hiwdg->Instance->PR = hiwdg->Init.Prescaler;
+ hiwdg->Instance->RLR = hiwdg->Init.Reload;
+
+ /* Check pending flag, if previous update not done, return timeout */
+ tickstart = HAL_GetTick();
+
+ /* Wait for register to be updated */
+ while (hiwdg->Instance->SR != 0x00u)
+ {
+ if ((HAL_GetTick() - tickstart) > HAL_IWDG_DEFAULT_TIMEOUT)
+ {
+ return HAL_TIMEOUT;
+ }
+ }
+
+ /* If window parameter is different than current value, modify window
+ register */
+ if (hiwdg->Instance->WINR != hiwdg->Init.Window)
+ {
+ /* Write to IWDG WINR the IWDG_Window value to compare with. In any case,
+ even if window feature is disabled, Watchdog will be reloaded by writing
+ windows register */
+ hiwdg->Instance->WINR = hiwdg->Init.Window;
+ }
+ else
+ {
+ /* Reload IWDG counter with value defined in the reload register */
+ __HAL_IWDG_RELOAD_COUNTER(hiwdg);
+ }
+
+ /* Return function status */
+ return HAL_OK;
+}
+
+/**
+ * @}
+ */
+
+
+/** @addtogroup IWDG_Exported_Functions_Group2
+ * @brief IO operation functions
+ *
+@verbatim
+ ===============================================================================
+ ##### IO operation functions #####
+ ===============================================================================
+ [..] This section provides functions allowing to:
+ (+) Refresh the IWDG.
+
+@endverbatim
+ * @{
+ */
+
+
+/**
+ * @brief Refresh the IWDG.
+ * @param hiwdg pointer to a IWDG_HandleTypeDef structure that contains
+ * the configuration information for the specified IWDG module.
+ * @retval HAL status
+ */
+HAL_StatusTypeDef HAL_IWDG_Refresh(IWDG_HandleTypeDef *hiwdg)
+{
+ /* Reload IWDG counter with value defined in the reload register */
+ __HAL_IWDG_RELOAD_COUNTER(hiwdg);
+
+ /* Return function status */
+ return HAL_OK;
+}
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+#endif /* HAL_IWDG_MODULE_ENABLED */
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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