看门狗与stm32hal库

applications/wdt.c

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2025-11-27     Administrator       the first version
+ */
+/*
+ * 程序清单：这是一个独立看门狗设备使用例程
+ * 例程导出了 wdt_sample 命令到控制终端
+ * 命令调用格式：wdt_sample wdt
+ * 命令解释：命令第二个参数是要使用的看门狗设备名称，为空则使用例程默认的看门狗设备。
+ * 程序功能：程序通过设备名称查找看门狗设备，然后初始化设备并设置看门狗设备溢出时间。
+ *           然后设置空闲线程回调函数，在回调函数里会喂狗。
+*/
+
+#include <rtthread.h>
+#include <rtdevice.h>
+
+#define WDT_DEVICE_NAME    "wdt"    /* 看门狗设备名称 */
+
+static rt_device_t wdg_dev;         /* 看门狗设备句柄 */
+
+#define DBG_TAG "WDT"
+#define DBG_LVL DBG_LOG
+#include <rtdbg.h>
+
+static void idle_hook(void)
+{
+    /* 在空闲线程的回调函数里喂狗 */
+    rt_device_control(wdg_dev, RT_DEVICE_CTRL_WDT_KEEPALIVE, NULL);
+}
+
+static int wdt_sample()
+{
+    rt_err_t ret = RT_EOK;
+    rt_uint32_t timeout = 1;        /* 溢出时间，单位：秒 */
+    char device_name[RT_NAME_MAX];
+
+    rt_strncpy(device_name, WDT_DEVICE_NAME, RT_NAME_MAX);
+    /* 根据设备名称查找看门狗设备，获取设备句柄 */
+    wdg_dev = rt_device_find(device_name);
+    if (!wdg_dev)
+    {
+        LOG_E("find %s failed!", device_name);
+        return RT_ERROR;
+    }
+    /* 初始化设备 */
+     rt_device_init(wdg_dev);
+    /* 设置看门狗溢出时间 */
+    ret = rt_device_control(wdg_dev, RT_DEVICE_CTRL_WDT_SET_TIMEOUT, &timeout);
+    if (ret != RT_EOK)
+    {
+        LOG_E("set %s timeout failed!", device_name);
+        return RT_ERROR;
+    }
+    /* 启动看门狗 */
+    ret = rt_device_control(wdg_dev, RT_DEVICE_CTRL_WDT_START, RT_NULL);
+    if (ret != RT_EOK)
+    {
+        LOG_E("start %s failed!", device_name);
+        return -RT_ERROR;
+    }
+    /* 设置空闲线程回调函数 */
+    rt_thread_idle_sethook(idle_hook);
+    LOG_I("start %s success!!", device_name);
+    return ret;
+}
+
+INIT_APP_EXPORT(wdt_sample);

cubemx/Drivers/STM32H7xx_HAL_Driver/Inc/stm32h7xx_hal_iwdg.h

@@ -0,0 +1,237 @@
+/**
+  ******************************************************************************
+  * @file    stm32h7xx_hal_iwdg.h
+  * @author  MCD Application Team
+  * @brief   Header file of IWDG HAL module.
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.
+  *
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
+  *
+  ******************************************************************************
+  */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef STM32H7xx_HAL_IWDG_H
+#define STM32H7xx_HAL_IWDG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32h7xx_hal_def.h"
+
+/** @addtogroup STM32H7xx_HAL_Driver
+  * @{
+  */
+
+/** @defgroup IWDG IWDG
+  * @{
+  */
+
+/* Exported types ------------------------------------------------------------*/
+/** @defgroup IWDG_Exported_Types IWDG Exported Types
+  * @{
+  */
+
+/**
+  * @brief  IWDG Init structure definition
+  */
+typedef struct
+{
+  uint32_t Prescaler;  /*!< Select the prescaler of the IWDG.
+                            This parameter can be a value of @ref IWDG_Prescaler */
+
+  uint32_t Reload;     /*!< Specifies the IWDG down-counter reload value.
+                            This parameter must be a number between Min_Data = 0 and Max_Data = 0x0FFF */
+
+  uint32_t Window;     /*!< Specifies the window value to be compared to the down-counter.
+                            This parameter must be a number between Min_Data = 0 and Max_Data = 0x0FFF */
+
+} IWDG_InitTypeDef;
+
+/**
+  * @brief  IWDG Handle Structure definition
+  */
+typedef struct
+{
+  IWDG_TypeDef                 *Instance;  /*!< Register base address    */
+
+  IWDG_InitTypeDef             Init;       /*!< IWDG required parameters */
+} IWDG_HandleTypeDef;
+
+
+/**
+  * @}
+  */
+
+/* Exported constants --------------------------------------------------------*/
+/** @defgroup IWDG_Exported_Constants IWDG Exported Constants
+  * @{
+  */
+
+/** @defgroup IWDG_Prescaler IWDG Prescaler
+  * @{
+  */
+#define IWDG_PRESCALER_4                0x00000000u                                     /*!< IWDG prescaler set to 4   */
+#define IWDG_PRESCALER_8                IWDG_PR_PR_0                                    /*!< IWDG prescaler set to 8   */
+#define IWDG_PRESCALER_16               IWDG_PR_PR_1                                    /*!< IWDG prescaler set to 16  */
+#define IWDG_PRESCALER_32               (IWDG_PR_PR_1 | IWDG_PR_PR_0)                   /*!< IWDG prescaler set to 32  */
+#define IWDG_PRESCALER_64               IWDG_PR_PR_2                                    /*!< IWDG prescaler set to 64  */
+#define IWDG_PRESCALER_128              (IWDG_PR_PR_2 | IWDG_PR_PR_0)                   /*!< IWDG prescaler set to 128 */
+#define IWDG_PRESCALER_256              (IWDG_PR_PR_2 | IWDG_PR_PR_1)                   /*!< IWDG prescaler set to 256 */
+/**
+  * @}
+  */
+
+/** @defgroup IWDG_Window_option IWDG Window option
+  * @{
+  */
+#define IWDG_WINDOW_DISABLE             IWDG_WINR_WIN
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/* Exported macros -----------------------------------------------------------*/
+/** @defgroup IWDG_Exported_Macros IWDG Exported Macros
+  * @{
+  */
+
+/**
+  * @brief  Enable the IWDG peripheral.
+  * @param  __HANDLE__  IWDG handle
+  * @retval None
+  */
+#define __HAL_IWDG_START(__HANDLE__)                WRITE_REG((__HANDLE__)->Instance->KR, IWDG_KEY_ENABLE)
+
+/**
+  * @brief  Reload IWDG counter with value defined in the reload register
+  *         (write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers disabled).
+  * @param  __HANDLE__  IWDG handle
+  * @retval None
+  */
+#define __HAL_IWDG_RELOAD_COUNTER(__HANDLE__)       WRITE_REG((__HANDLE__)->Instance->KR, IWDG_KEY_RELOAD)
+
+/**
+  * @}
+  */
+
+/* Exported functions --------------------------------------------------------*/
+/** @defgroup IWDG_Exported_Functions  IWDG Exported Functions
+  * @{
+  */
+
+/** @defgroup IWDG_Exported_Functions_Group1 Initialization and Start functions
+  * @{
+  */
+/* Initialization/Start functions  ********************************************/
+HAL_StatusTypeDef     HAL_IWDG_Init(IWDG_HandleTypeDef *hiwdg);
+/**
+  * @}
+  */
+
+/** @defgroup IWDG_Exported_Functions_Group2 IO operation functions
+  * @{
+  */
+/* I/O operation functions ****************************************************/
+HAL_StatusTypeDef     HAL_IWDG_Refresh(IWDG_HandleTypeDef *hiwdg);
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/* Private constants ---------------------------------------------------------*/
+/** @defgroup IWDG_Private_Constants IWDG Private Constants
+  * @{
+  */
+
+/**
+  * @brief  IWDG Key Register BitMask
+  */
+#define IWDG_KEY_RELOAD                 0x0000AAAAu  /*!< IWDG Reload Counter Enable   */
+#define IWDG_KEY_ENABLE                 0x0000CCCCu  /*!< IWDG Peripheral Enable       */
+#define IWDG_KEY_WRITE_ACCESS_ENABLE    0x00005555u  /*!< IWDG KR Write Access Enable  */
+#define IWDG_KEY_WRITE_ACCESS_DISABLE   0x00000000u  /*!< IWDG KR Write Access Disable */
+
+/**
+  * @}
+  */
+
+/* Private macros ------------------------------------------------------------*/
+/** @defgroup IWDG_Private_Macros IWDG Private Macros
+  * @{
+  */
+
+/**
+  * @brief  Enable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers.
+  * @param  __HANDLE__  IWDG handle
+  * @retval None
+  */
+#define IWDG_ENABLE_WRITE_ACCESS(__HANDLE__)  WRITE_REG((__HANDLE__)->Instance->KR, IWDG_KEY_WRITE_ACCESS_ENABLE)
+
+/**
+  * @brief  Disable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers.
+  * @param  __HANDLE__  IWDG handle
+  * @retval None
+  */
+#define IWDG_DISABLE_WRITE_ACCESS(__HANDLE__) WRITE_REG((__HANDLE__)->Instance->KR, IWDG_KEY_WRITE_ACCESS_DISABLE)
+
+/**
+  * @brief  Check IWDG prescaler value.
+  * @param  __PRESCALER__  IWDG prescaler value
+  * @retval None
+  */
+#define IS_IWDG_PRESCALER(__PRESCALER__)      (((__PRESCALER__) == IWDG_PRESCALER_4)  || \
+                                               ((__PRESCALER__) == IWDG_PRESCALER_8)  || \
+                                               ((__PRESCALER__) == IWDG_PRESCALER_16) || \
+                                               ((__PRESCALER__) == IWDG_PRESCALER_32) || \
+                                               ((__PRESCALER__) == IWDG_PRESCALER_64) || \
+                                               ((__PRESCALER__) == IWDG_PRESCALER_128)|| \
+                                               ((__PRESCALER__) == IWDG_PRESCALER_256))
+
+/**
+  * @brief  Check IWDG reload value.
+  * @param  __RELOAD__  IWDG reload value
+  * @retval None
+  */
+#define IS_IWDG_RELOAD(__RELOAD__)            ((__RELOAD__) <= IWDG_RLR_RL)
+
+/**
+  * @brief  Check IWDG window value.
+  * @param  __WINDOW__  IWDG window value
+  * @retval None
+  */
+#define IS_IWDG_WINDOW(__WINDOW__)            ((__WINDOW__) <= IWDG_WINR_WIN)
+
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* STM32H7xx_HAL_IWDG_H */

cubemx/Drivers/STM32H7xx_HAL_Driver/Inc/stm32h7xx_ll_iwdg.h

@@ -0,0 +1,338 @@
+/**
+  ******************************************************************************
+  * @file    stm32h7xx_ll_iwdg.h
+  * @author  MCD Application Team
+  * @brief   Header file of IWDG LL module.
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.
+  *
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
+  *
+  ******************************************************************************
+  */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef STM32H7xx_LL_IWDG_H
+#define STM32H7xx_LL_IWDG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32h7xx.h"
+
+/** @addtogroup STM32H7xx_LL_Driver
+  * @{
+  */
+
+#if defined(IWDG1) || defined(IWDG2)
+
+/** @defgroup IWDG_LL IWDG
+  * @{
+  */
+
+/* Private types -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+
+/* Private constants ---------------------------------------------------------*/
+/** @defgroup IWDG_LL_Private_Constants IWDG Private Constants
+  * @{
+  */
+#define LL_IWDG_KEY_RELOAD                 0x0000AAAAU               /*!< IWDG Reload Counter Enable   */
+#define LL_IWDG_KEY_ENABLE                 0x0000CCCCU               /*!< IWDG Peripheral Enable       */
+#define LL_IWDG_KEY_WR_ACCESS_ENABLE       0x00005555U               /*!< IWDG KR Write Access Enable  */
+#define LL_IWDG_KEY_WR_ACCESS_DISABLE      0x00000000U               /*!< IWDG KR Write Access Disable */
+/**
+  * @}
+  */
+
+/* Private macros ------------------------------------------------------------*/
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+/** @defgroup IWDG_LL_Exported_Constants IWDG Exported Constants
+  * @{
+  */
+
+/** @defgroup IWDG_LL_EC_GET_FLAG Get Flags Defines
+  * @brief    Flags defines which can be used with LL_IWDG_ReadReg function
+  * @{
+  */
+#define LL_IWDG_SR_PVU                     IWDG_SR_PVU                           /*!< Watchdog prescaler value update */
+#define LL_IWDG_SR_RVU                     IWDG_SR_RVU                           /*!< Watchdog counter reload value update */
+#define LL_IWDG_SR_WVU                     IWDG_SR_WVU                           /*!< Watchdog counter window value update */
+/**
+  * @}
+  */
+
+/** @defgroup IWDG_LL_EC_PRESCALER  Prescaler Divider
+  * @{
+  */
+#define LL_IWDG_PRESCALER_4                0x00000000U                           /*!< Divider by 4   */
+#define LL_IWDG_PRESCALER_8                (IWDG_PR_PR_0)                        /*!< Divider by 8   */
+#define LL_IWDG_PRESCALER_16               (IWDG_PR_PR_1)                        /*!< Divider by 16  */
+#define LL_IWDG_PRESCALER_32               (IWDG_PR_PR_1 | IWDG_PR_PR_0)         /*!< Divider by 32  */
+#define LL_IWDG_PRESCALER_64               (IWDG_PR_PR_2)                        /*!< Divider by 64  */
+#define LL_IWDG_PRESCALER_128              (IWDG_PR_PR_2 | IWDG_PR_PR_0)         /*!< Divider by 128 */
+#define LL_IWDG_PRESCALER_256              (IWDG_PR_PR_2 | IWDG_PR_PR_1)         /*!< Divider by 256 */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/* Exported macro ------------------------------------------------------------*/
+/** @defgroup IWDG_LL_Exported_Macros IWDG Exported Macros
+  * @{
+  */
+
+/** @defgroup IWDG_LL_EM_WRITE_READ Common Write and read registers Macros
+  * @{
+  */
+
+/**
+  * @brief  Write a value in IWDG register
+  * @param  __INSTANCE__ IWDG Instance
+  * @param  __REG__ Register to be written
+  * @param  __VALUE__ Value to be written in the register
+  * @retval None
+  */
+#define LL_IWDG_WriteReg(__INSTANCE__, __REG__, __VALUE__) WRITE_REG(__INSTANCE__->__REG__, (__VALUE__))
+
+/**
+  * @brief  Read a value in IWDG register
+  * @param  __INSTANCE__ IWDG Instance
+  * @param  __REG__ Register to be read
+  * @retval Register value
+  */
+#define LL_IWDG_ReadReg(__INSTANCE__, __REG__) READ_REG(__INSTANCE__->__REG__)
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+
+/* Exported functions --------------------------------------------------------*/
+/** @defgroup IWDG_LL_Exported_Functions IWDG Exported Functions
+  * @{
+  */
+/** @defgroup IWDG_LL_EF_Configuration Configuration
+  * @{
+  */
+
+/**
+  * @brief  Start the Independent Watchdog
+  * @note   Except if the hardware watchdog option is selected
+  * @rmtoll KR           KEY           LL_IWDG_Enable
+  * @param  IWDGx IWDG Instance
+  * @retval None
+  */
+__STATIC_INLINE void LL_IWDG_Enable(IWDG_TypeDef *IWDGx)
+{
+  WRITE_REG(IWDGx->KR, LL_IWDG_KEY_ENABLE);
+}
+
+/**
+  * @brief  Reloads IWDG counter with value defined in the reload register
+  * @rmtoll KR           KEY           LL_IWDG_ReloadCounter
+  * @param  IWDGx IWDG Instance
+  * @retval None
+  */
+__STATIC_INLINE void LL_IWDG_ReloadCounter(IWDG_TypeDef *IWDGx)
+{
+  WRITE_REG(IWDGx->KR, LL_IWDG_KEY_RELOAD);
+}
+
+/**
+  * @brief  Enable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers
+  * @rmtoll KR           KEY           LL_IWDG_EnableWriteAccess
+  * @param  IWDGx IWDG Instance
+  * @retval None
+  */
+__STATIC_INLINE void LL_IWDG_EnableWriteAccess(IWDG_TypeDef *IWDGx)
+{
+  WRITE_REG(IWDGx->KR, LL_IWDG_KEY_WR_ACCESS_ENABLE);
+}
+
+/**
+  * @brief  Disable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers
+  * @rmtoll KR           KEY           LL_IWDG_DisableWriteAccess
+  * @param  IWDGx IWDG Instance
+  * @retval None
+  */
+__STATIC_INLINE void LL_IWDG_DisableWriteAccess(IWDG_TypeDef *IWDGx)
+{
+  WRITE_REG(IWDGx->KR, LL_IWDG_KEY_WR_ACCESS_DISABLE);
+}
+
+/**
+  * @brief  Select the prescaler of the IWDG
+  * @rmtoll PR           PR            LL_IWDG_SetPrescaler
+  * @param  IWDGx IWDG Instance
+  * @param  Prescaler This parameter can be one of the following values:
+  *         @arg @ref LL_IWDG_PRESCALER_4
+  *         @arg @ref LL_IWDG_PRESCALER_8
+  *         @arg @ref LL_IWDG_PRESCALER_16
+  *         @arg @ref LL_IWDG_PRESCALER_32
+  *         @arg @ref LL_IWDG_PRESCALER_64
+  *         @arg @ref LL_IWDG_PRESCALER_128
+  *         @arg @ref LL_IWDG_PRESCALER_256
+  * @retval None
+  */
+__STATIC_INLINE void LL_IWDG_SetPrescaler(IWDG_TypeDef *IWDGx, uint32_t Prescaler)
+{
+  WRITE_REG(IWDGx->PR, IWDG_PR_PR & Prescaler);
+}
+
+/**
+  * @brief  Get the selected prescaler of the IWDG
+  * @rmtoll PR           PR            LL_IWDG_GetPrescaler
+  * @param  IWDGx IWDG Instance
+  * @retval Returned value can be one of the following values:
+  *         @arg @ref LL_IWDG_PRESCALER_4
+  *         @arg @ref LL_IWDG_PRESCALER_8
+  *         @arg @ref LL_IWDG_PRESCALER_16
+  *         @arg @ref LL_IWDG_PRESCALER_32
+  *         @arg @ref LL_IWDG_PRESCALER_64
+  *         @arg @ref LL_IWDG_PRESCALER_128
+  *         @arg @ref LL_IWDG_PRESCALER_256
+  */
+__STATIC_INLINE uint32_t LL_IWDG_GetPrescaler(const IWDG_TypeDef *IWDGx)
+{
+  return (READ_REG(IWDGx->PR));
+}
+
+/**
+  * @brief  Specify the IWDG down-counter reload value
+  * @rmtoll RLR          RL            LL_IWDG_SetReloadCounter
+  * @param  IWDGx IWDG Instance
+  * @param  Counter Value between Min_Data=0 and Max_Data=0x0FFF
+  * @retval None
+  */
+__STATIC_INLINE void LL_IWDG_SetReloadCounter(IWDG_TypeDef *IWDGx, uint32_t Counter)
+{
+  WRITE_REG(IWDGx->RLR, IWDG_RLR_RL & Counter);
+}
+
+/**
+  * @brief  Get the specified IWDG down-counter reload value
+  * @rmtoll RLR          RL            LL_IWDG_GetReloadCounter
+  * @param  IWDGx IWDG Instance
+  * @retval Value between Min_Data=0 and Max_Data=0x0FFF
+  */
+__STATIC_INLINE uint32_t LL_IWDG_GetReloadCounter(const IWDG_TypeDef *IWDGx)
+{
+  return (READ_REG(IWDGx->RLR));
+}
+
+/**
+  * @brief  Specify high limit of the window value to be compared to the down-counter.
+  * @rmtoll WINR         WIN           LL_IWDG_SetWindow
+  * @param  IWDGx IWDG Instance
+  * @param  Window Value between Min_Data=0 and Max_Data=0x0FFF
+  * @retval None
+  */
+__STATIC_INLINE void LL_IWDG_SetWindow(IWDG_TypeDef *IWDGx, uint32_t Window)
+{
+  WRITE_REG(IWDGx->WINR, IWDG_WINR_WIN & Window);
+}
+
+/**
+  * @brief  Get the high limit of the window value specified.
+  * @rmtoll WINR         WIN           LL_IWDG_GetWindow
+  * @param  IWDGx IWDG Instance
+  * @retval Value between Min_Data=0 and Max_Data=0x0FFF
+  */
+__STATIC_INLINE uint32_t LL_IWDG_GetWindow(const IWDG_TypeDef *IWDGx)
+{
+  return (READ_REG(IWDGx->WINR));
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup IWDG_LL_EF_FLAG_Management FLAG_Management
+  * @{
+  */
+
+/**
+  * @brief  Check if flag Prescaler Value Update is set or not
+  * @rmtoll SR           PVU           LL_IWDG_IsActiveFlag_PVU
+  * @param  IWDGx IWDG Instance
+  * @retval State of bit (1 or 0).
+  */
+__STATIC_INLINE uint32_t LL_IWDG_IsActiveFlag_PVU(const IWDG_TypeDef *IWDGx)
+{
+  return ((READ_BIT(IWDGx->SR, IWDG_SR_PVU) == (IWDG_SR_PVU)) ? 1UL : 0UL);
+}
+
+/**
+  * @brief  Check if flag Reload Value Update is set or not
+  * @rmtoll SR           RVU           LL_IWDG_IsActiveFlag_RVU
+  * @param  IWDGx IWDG Instance
+  * @retval State of bit (1 or 0).
+  */
+__STATIC_INLINE uint32_t LL_IWDG_IsActiveFlag_RVU(const IWDG_TypeDef *IWDGx)
+{
+  return ((READ_BIT(IWDGx->SR, IWDG_SR_RVU) == (IWDG_SR_RVU)) ? 1UL : 0UL);
+}
+
+/**
+  * @brief  Check if flag Window Value Update is set or not
+  * @rmtoll SR           WVU           LL_IWDG_IsActiveFlag_WVU
+  * @param  IWDGx IWDG Instance
+  * @retval State of bit (1 or 0).
+  */
+__STATIC_INLINE uint32_t LL_IWDG_IsActiveFlag_WVU(const IWDG_TypeDef *IWDGx)
+{
+  return ((READ_BIT(IWDGx->SR, IWDG_SR_WVU) == (IWDG_SR_WVU)) ? 1UL : 0UL);
+}
+
+/**
+  * @brief  Check if all flags Prescaler, Reload & Window Value Update are reset or not
+  * @rmtoll SR           PVU           LL_IWDG_IsReady\n
+  *         SR           RVU           LL_IWDG_IsReady\n
+  *         SR           WVU           LL_IWDG_IsReady
+  * @param  IWDGx IWDG Instance
+  * @retval State of bits (1 or 0).
+  */
+__STATIC_INLINE uint32_t LL_IWDG_IsReady(const IWDG_TypeDef *IWDGx)
+{
+  return ((READ_BIT(IWDGx->SR, IWDG_SR_PVU | IWDG_SR_RVU | IWDG_SR_WVU) == 0U) ? 1UL : 0UL);
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#endif /* IWDG1 || IWDG2 */
+
+/**
+  * @}
+  */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* STM32H7xx_LL_IWDG_H */

cubemx/Drivers/STM32H7xx_HAL_Driver/Src/stm32h7xx_hal_iwdg.c

@@ -0,0 +1,284 @@
+/**
+  ******************************************************************************
+  * @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
+  *
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.
+  *
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
+  *
+  ******************************************************************************
+  @verbatim
+  ==============================================================================
+                    ##### IWDG Generic features #####
+  ==============================================================================
+  [..]
+    (+) The IWDG can be started by either software or hardware (configurable
+        through option byte).
+
+    (+) The IWDG is clocked by the Low-Speed Internal clock (LSI) and thus stays
+        active even if the main clock fails.
+
+    (+) Once the IWDG is started, the LSI is forced ON and both cannot 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 into 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 the CPU 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 clock frequency dispersion.
+         STM32H7xx devices provide the capability to measure the LSI clock
+         frequency (LSI clock is internally connected to TIM16 CH1 input capture).
+         The measured value can be used to have an IWDG timeout with an
+         acceptable accuracy.
+
+    [..] Default timeout value (necessary for IWDG_SR status register update):
+         Constant LSI_VALUE is defined based on the nominal LSI clock frequency.
+         This frequency being subject to variations as mentioned above, the
+         default timeout value (defined through constant HAL_IWDG_DEFAULT_TIMEOUT
+         below) may become too short or too long.
+         In such cases, this default timeout value can be tuned by redefining
+         the constant LSI_VALUE at user-application level (based, for instance,
+         on the measured LSI clock frequency as explained above).
+
+                     ##### 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.
+      (++) 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.
+      (++) Wait for status flags to be reset.
+
+    (#) 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
+  */
+
+/* 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 needs up to 5 LSI clock periods divided by the clock
+   prescaler to be updated. The number of LSI clock periods is upper-rounded to
+   6 for the timeout value calculation.
+   The timeout value is calculated using the highest prescaler (256) and
+   the LSI_VALUE constant. The value of this constant can be changed by the user
+   to take into account possible LSI clock period variations.
+   The timeout value is multiplied by 1000 to be converted in milliseconds.
+   LSI startup time is also considered here by adding LSI_STARTUP_TIME
+   converted in milliseconds. */
+#define HAL_IWDG_DEFAULT_TIMEOUT        (((6UL * 256UL * 1000UL) / (LSI_VALUE / 128U)) + \
+                                         ((LSI_STARTUP_TIME / 1000UL) + 1UL))
+#define IWDG_KERNEL_UPDATE_FLAGS        (IWDG_SR_WVU | IWDG_SR_RVU | IWDG_SR_PVU)
+/**
+  * @}
+  */
+
+/* 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 & IWDG_KERNEL_UPDATE_FLAGS) != 0x00u)
+  {
+    if ((HAL_GetTick() - tickstart) > HAL_IWDG_DEFAULT_TIMEOUT)
+    {
+      if ((hiwdg->Instance->SR & IWDG_KERNEL_UPDATE_FLAGS) != 0x00u)
+      {
+        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 */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */