import CMSIS 1.3.2 (from STM32Cube FW_F4 V1.7.0)

1 files changed, 361 insertions, 355 deletions

diff --git a/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_iwdg.c b/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_iwdg.c
index 2fdd73b..7e157f9 100644
--- a/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_iwdg.c
+++ b/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_iwdg.c
@@ -1,355 +1,361 @@
-/**

-  ******************************************************************************

-  * @file    stm32f4xx_hal_iwdg.c

-  * @author  MCD Application Team

-  * @version V1.1.0

-  * @date    19-June-2014

-  * @brief   IWDG HAL module driver.

-  *          This file provides firmware functions to manage the following 

-  *          functionalities of the Independent Watchdog (IWDG) peripheral:

-  *           + Initialization and de-initialization functions

-  *           + IO operation functions

-  *           + Peripheral State functions

-  *         

-  @verbatim 

-  ==============================================================================

-                    ##### IWDG Generic features #####

-  ==============================================================================

-    [..] 

-    (+) The IWDG can be started by either software or hardware (configurable

-         through option byte).

-    

-    (+) The IWDG is clocked by its own dedicated 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 cannot be disabled

-         (LSI cannot be disabled too), and the counter starts counting down from 

-         the reset value of 0xFFF. When it reaches the end of count value (0x000)

-         a system reset is generated.

-

-    (+) The IWDG counter should be refreshed at regular intervals, otherwise the

-         watchdog generates an MCU reset when the counter reaches 0.          

- 

-    (+) 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.

-

-    (+) Min-max timeout value @32KHz (LSI): ~125us / ~32.7s

-         The IWDG timeout may vary due to LSI frequency dispersion. STM32F4xx

-         devices provide the capability to measure the LSI frequency (LSI clock

-         connected internally to TIM5 CH4 input capture). The measured value

-         can be used to have an IWDG timeout with an acceptable accuracy.

-

-

-                     ##### How to use this driver #####

-  ==============================================================================

-    [..]

-    If Window option is disabled

-      (+) Use IWDG using HAL_IWDG_Init() function to :

-         (++) Enable write access to IWDG_PR, IWDG_RLR.

-         (++) Configure the IWDG prescaler, counter reload value.

-              This reload value will be loaded in the IWDG counter each time the counter

-              is reloaded, then the IWDG will start counting down from this value.

-    [..]

-      (+) Use IWDG using HAL_IWDG_Start() function to:

-          (++) Reload IWDG counter with value defined in the IWDG_RLR register.

-          (++) Start the IWDG, when the IWDG is used in software mode (no need 

-               to enable the LSI, it will be enabled by hardware).

-      (+) 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.

-    [..] 

-    if Window option is enabled:

-      

-      (+) Use IWDG using HAL_IWDG_Start() function to enable IWDG downcounter

-      (+) Use IWDG using HAL_IWDG_Init() function to :

-         (++) Enable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers.

-         (++) Configure the IWDG prescaler, reload value and window value.

-      (+) 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    

-      (+) __HAL_IWDG_ENABLE_WRITE_ACCESS : Enable write access to IWDG_PR and IWDG_RLR registers

-      (+) __HAL_IWDG_DISABLE_WRITE_ACCESS : Disable write access to IWDG_PR and IWDG_RLR registers

-      (+) __HAL_IWDG_GET_FLAG: Get the selected IWDG's flag status

-

-  @endverbatim

-  ******************************************************************************

-  * @attention

-  *

-  * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>

-  *

-  * 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 STMicroelectronics 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.

-  *

-  ******************************************************************************

-  */ 

-

-/* Includes ------------------------------------------------------------------*/

-#include "stm32f4xx_hal.h"

-

-/** @addtogroup STM32F4xx_HAL_Driver

-  * @{

-  */

-

-/** @defgroup IWDG 

-  * @brief IWDG HAL module driver.

-  * @{

-  */

-

-#ifdef HAL_IWDG_MODULE_ENABLED

-

-/* Private typedef -----------------------------------------------------------*/

-/* Private define ------------------------------------------------------------*/

-#define IWDG_TIMEOUT_FLAG          ((uint32_t)1000)     /* 1 s */

-/* Private macro -------------------------------------------------------------*/

-/* Private variables ---------------------------------------------------------*/

-/* Private function prototypes -----------------------------------------------*/

-/* Private functions ---------------------------------------------------------*/

-

-/** @defgroup IWDG_Private_Functions

-  * @{

-  */

-

-/** @defgroup IWDG_Group1 Initialization and de-initialization functions 

- *  @brief    Initialization and Configuration functions. 

- *

-@verbatim    

- ===============================================================================

-          ##### Initialization and de-initialization functions #####

- ===============================================================================

-    [..]  This section provides functions allowing to:

-      (+) Initialize the IWDG according to the specified parameters 

-          in the IWDG_InitTypeDef and create the associated handle

-      (+) Initialize the IWDG MSP

-      (+) DeInitialize IWDG MSP 

- 

-@endverbatim

-  * @{

-  */

-

-/**

-  * @brief  Initializes the IWDG according to the specified

-  *         parameters in the IWDG_InitTypeDef and creates the associated handle.

-  * @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)

-{

-  /* 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)); 

-  

-  if(hiwdg->State == HAL_IWDG_STATE_RESET)

-  {  

-    /* Init the low level hardware */

-    HAL_IWDG_MspInit(hiwdg);

-  }

-  

-  /* Change IWDG peripheral state */

-  hiwdg->State = HAL_IWDG_STATE_BUSY;  

-  

-  /* Enable write access to IWDG_PR and IWDG_RLR registers */  

-  __HAL_IWDG_ENABLE_WRITE_ACCESS(hiwdg);

-  

-  /* Write to IWDG registers the IWDG_Prescaler & IWDG_Reload values to work with */

-  MODIFY_REG(hiwdg->Instance->PR, IWDG_PR_PR, hiwdg->Init.Prescaler);

-  MODIFY_REG(hiwdg->Instance->RLR, IWDG_RLR_RL, hiwdg->Init.Reload);

- 

-  /* Change IWDG peripheral state */

-  hiwdg->State = HAL_IWDG_STATE_READY;

-  

-  /* Return function status */

-  return HAL_OK;

-}

-

-/**

-  * @brief  Initializes the IWDG MSP.

-  * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains

-  *                the configuration information for the specified IWDG module.

-  * @retval None

-  */

-__weak void HAL_IWDG_MspInit(IWDG_HandleTypeDef *hiwdg)

-{

-  /* NOTE : This function Should not be modified, when the callback is needed,

-            the HAL_IWDG_MspInit could be implemented in the user file

-   */

-}

-

-/**

-  * @}

-  */

-

-/** @defgroup IWDG_Group2 IO operation functions  

- *  @brief   IO operation functions  

- *

-@verbatim   

- ===============================================================================

-                      ##### IO operation functions #####

- ===============================================================================  

-    [..]  This section provides functions allowing to:

-      (+) Start the IWDG.

-      (+) Refresh the IWDG.

-

-@endverbatim

-  * @{

-  */

-

-/**

-  * @brief  Starts 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_Start(IWDG_HandleTypeDef *hiwdg)

-{

-  /* Process Locked */

-  __HAL_LOCK(hiwdg); 

-  

-    /* Change IWDG peripheral state */  

-  hiwdg->State = HAL_IWDG_STATE_BUSY;

-

-  /* Start the IWDG peripheral */

-  __HAL_IWDG_START(hiwdg);

-  

-    /* Reload IWDG counter with value defined in the RLR register */

-  __HAL_IWDG_RELOAD_COUNTER(hiwdg);

-  

-  /* Change IWDG peripheral state */    

-  hiwdg->State = HAL_IWDG_STATE_READY; 

-  

-  /* Process Unlocked */

-  __HAL_UNLOCK(hiwdg);

-  

-  /* Return function status */

-  return HAL_OK;

-}

-

-/**

-  * @brief  Refreshes 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)

-{

-  uint32_t tickstart = 0;

-

-  /* Process Locked */

-  __HAL_LOCK(hiwdg);

-

-    /* Change IWDG peripheral state */

-  hiwdg->State = HAL_IWDG_STATE_BUSY;

-

-  tickstart = HAL_GetTick();

-

-  /* Wait until RVU flag is RESET */

-  while(__HAL_IWDG_GET_FLAG(hiwdg, IWDG_FLAG_RVU) != RESET)

-  {

-    if((HAL_GetTick() - tickstart ) > IWDG_TIMEOUT_FLAG)

-    {

-      /* Set IWDG state */

-      hiwdg->State = HAL_IWDG_STATE_TIMEOUT;

-

-       /* Process unlocked */

-      __HAL_UNLOCK(hiwdg);

-

-      return HAL_TIMEOUT;

-    }

-  }

-  

-  /* Reload IWDG counter with value defined in the reload register */

-  __HAL_IWDG_RELOAD_COUNTER(hiwdg);

-    

-  /* Change IWDG peripheral state */    

-  hiwdg->State = HAL_IWDG_STATE_READY; 

-  

-  /* Process Unlocked */

-  __HAL_UNLOCK(hiwdg);

-  

-  /* Return function status */

-  return HAL_OK;

-}

-

-/**

-  * @}

-  */

-

-/** @defgroup IWDG_Group3 Peripheral State functions 

- *  @brief    Peripheral State functions. 

- *

-@verbatim   

- ===============================================================================

-                      ##### Peripheral State functions #####

- ===============================================================================  

-    [..]

-    This subsection permits to get in run-time the status of the peripheral 

-    and the data flow.

-

-@endverbatim

-  * @{

-  */

-

-/**

-  * @brief  Returns the IWDG state.

-  * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains

-  *                the configuration information for the specified IWDG module.

-  * @retval HAL state

-  */

-HAL_IWDG_StateTypeDef HAL_IWDG_GetState(IWDG_HandleTypeDef *hiwdg)

-{

-  return hiwdg->State;

-}

-

-/**

-  * @}

-  */

-

-/**

-  * @}

-  */

-

-#endif /* HAL_IWDG_MODULE_ENABLED */

-/**

-  * @}

-  */

-

-/**

-  * @}

-  */

-

-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

+/**
+  ******************************************************************************
+  * @file    stm32f4xx_hal_iwdg.c
+  * @author  MCD Application Team
+  * @version V1.3.2
+  * @date    26-June-2015
+  * @brief   IWDG HAL module driver.
+  *          This file provides firmware functions to manage the following
+  *          functionalities of the Independent Watchdog (IWDG) peripheral:
+  *           + Initialization and Configuration functions
+  *           + IO operation functions
+  *           + Peripheral State functions
+  *
+  @verbatim
+  ==============================================================================
+                    ##### IWDG Specific features #####
+  ==============================================================================
+    [..]
+    (+) The IWDG can be started by either software or hardware (configurable
+         through option byte).
+
+    (+) The IWDG is clocked by its own dedicated 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 cannot be disabled
+         (LSI cannot be disabled too), and the counter starts counting down from
+         the reset value of 0xFFF. When it reaches the end of count value (0x000)
+         a system reset is generated.
+
+    (+) The IWDG counter should be refreshed at regular intervals, otherwise the
+         watchdog generates an MCU reset when the counter reaches 0.
+
+    (+) 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.
+
+    (+) Min-max timeout value @32KHz (LSI): ~125us / ~32.7s
+         The IWDG timeout may vary due to LSI frequency dispersion. STM32F4xx
+         devices provide the capability to measure the LSI frequency (LSI clock
+         connected internally to TIM5 CH4 input capture). The measured value
+         can be used to have an IWDG timeout with an acceptable accuracy.
+
+
+                     ##### How to use this driver #####
+  ==============================================================================
+    [..]
+    If Window option is disabled
+      (+) Use IWDG using HAL_IWDG_Init() function to :
+         (++) Enable write access to IWDG_PR, IWDG_RLR.
+         (++) Configure the IWDG prescaler, counter reload value.
+              This reload value will be loaded in the IWDG counter each time the counter
+              is reloaded, then the IWDG will start counting down from this value.
+    [..]
+      (+) Use IWDG using HAL_IWDG_Start() function to:
+          (++) Reload IWDG counter with value defined in the IWDG_RLR register.
+          (++) Start the IWDG, when the IWDG is used in software mode (no need
+               to enable the LSI, it will be enabled by hardware).
+      (+) 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.
+    [..]
+    if Window option is enabled:
+
+      (+) Use IWDG using HAL_IWDG_Start() function to enable IWDG downcounter
+      (+) Use IWDG using HAL_IWDG_Init() function to :
+         (++) Enable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers.
+         (++) Configure the IWDG prescaler, reload value and window value.
+      (+) 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
+      (+) __HAL_IWDG_GET_FLAG: Get the selected IWDG's flag status
+
+  @endverbatim
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
+  *
+  * 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 STMicroelectronics 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.
+  *
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f4xx_hal.h"
+
+/** @addtogroup STM32F4xx_HAL_Driver
+  * @{
+  */
+
+/** @defgroup IWDG IWDG
+  * @brief IWDG HAL module driver.
+  * @{
+  */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+ /** @addtogroup IWDG_Private_Constants
+  * @{
+  */
+#define IWDG_TIMEOUT_FLAG          ((uint32_t)1000)     /* 1 s */
+/**
+  * @}
+  */
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+/* Exported functions --------------------------------------------------------*/
+/** @defgroup IWDG_Exported_Functions IWDG Exported Functions
+  * @{
+  */
+
+/** @defgroup IWDG_Exported_Functions_Group1 Initialization and de-initialization functions
+ *  @brief    Initialization and Configuration functions.
+ *
+@verbatim
+ ===============================================================================
+          ##### Initialization and de-initialization functions #####
+ ===============================================================================
+    [..]  This section provides functions allowing to:
+      (+) Initialize the IWDG according to the specified parameters
+          in the IWDG_InitTypeDef and create the associated handle
+      (+) Initialize the IWDG MSP
+      (+) DeInitialize IWDG MSP
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Initializes the IWDG according to the specified
+  *         parameters in the IWDG_InitTypeDef and creates the associated handle.
+  * @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)
+{
+  /* 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));
+
+  if(hiwdg->State == HAL_IWDG_STATE_RESET)
+  {
+    /* Allocate lock resource and initialize it */
+    hiwdg->Lock = HAL_UNLOCKED;
+    /* Init the low level hardware */
+    HAL_IWDG_MspInit(hiwdg);
+  }
+
+  /* Change IWDG peripheral state */
+  hiwdg->State = HAL_IWDG_STATE_BUSY;
+
+  /* Enable write access to IWDG_PR and IWDG_RLR registers */
+  IWDG_ENABLE_WRITE_ACCESS(hiwdg);
+
+  /* Write to IWDG registers the IWDG_Prescaler & IWDG_Reload values to work with */
+  MODIFY_REG(hiwdg->Instance->PR, IWDG_PR_PR, hiwdg->Init.Prescaler);
+  MODIFY_REG(hiwdg->Instance->RLR, IWDG_RLR_RL, hiwdg->Init.Reload);
+
+  /* Change IWDG peripheral state */
+  hiwdg->State = HAL_IWDG_STATE_READY;
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  Initializes the IWDG MSP.
+  * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
+  *                the configuration information for the specified IWDG module.
+  * @retval None
+  */
+__weak void HAL_IWDG_MspInit(IWDG_HandleTypeDef *hiwdg)
+{
+  /* NOTE : This function Should not be modified, when the callback is needed,
+            the HAL_IWDG_MspInit could be implemented in the user file
+   */
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup IWDG_Exported_Functions_Group2 IO operation functions
+ *  @brief   IO operation functions
+ *
+@verbatim
+ ===============================================================================
+                      ##### IO operation functions #####
+ ===============================================================================
+    [..]  This section provides functions allowing to:
+      (+) Start the IWDG.
+      (+) Refresh the IWDG.
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Starts 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_Start(IWDG_HandleTypeDef *hiwdg)
+{
+  /* Process Locked */
+  __HAL_LOCK(hiwdg);
+
+    /* Change IWDG peripheral state */
+  hiwdg->State = HAL_IWDG_STATE_BUSY;
+
+  /* Start the IWDG peripheral */
+  __HAL_IWDG_START(hiwdg);
+
+    /* Reload IWDG counter with value defined in the RLR register */
+  __HAL_IWDG_RELOAD_COUNTER(hiwdg);
+
+  /* Change IWDG peripheral state */
+  hiwdg->State = HAL_IWDG_STATE_READY;
+
+  /* Process Unlocked */
+  __HAL_UNLOCK(hiwdg);
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  Refreshes 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)
+{
+  uint32_t tickstart = 0;
+
+  /* Process Locked */
+  __HAL_LOCK(hiwdg);
+
+    /* Change IWDG peripheral state */
+  hiwdg->State = HAL_IWDG_STATE_BUSY;
+
+  tickstart = HAL_GetTick();
+
+  /* Wait until RVU flag is RESET */
+  while(__HAL_IWDG_GET_FLAG(hiwdg, IWDG_FLAG_RVU) != RESET)
+  {
+    if((HAL_GetTick() - tickstart ) > IWDG_TIMEOUT_FLAG)
+    {
+      /* Set IWDG state */
+      hiwdg->State = HAL_IWDG_STATE_TIMEOUT;
+
+       /* Process unlocked */
+      __HAL_UNLOCK(hiwdg);
+
+      return HAL_TIMEOUT;
+    }
+  }
+
+  /* Reload IWDG counter with value defined in the reload register */
+  __HAL_IWDG_RELOAD_COUNTER(hiwdg);
+
+  /* Change IWDG peripheral state */
+  hiwdg->State = HAL_IWDG_STATE_READY;
+
+  /* Process Unlocked */
+  __HAL_UNLOCK(hiwdg);
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup IWDG_Exported_Functions_Group3 Peripheral State functions
+ *  @brief    Peripheral State functions.
+ *
+@verbatim
+ ===============================================================================
+                      ##### Peripheral State functions #####
+ ===============================================================================
+    [..]
+    This subsection permits to get in run-time the status of the peripheral
+    and the data flow.
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Returns the IWDG state.
+  * @param  hiwdg: pointer to a IWDG_HandleTypeDef structure that contains
+  *                the configuration information for the specified IWDG module.
+  * @retval HAL state
+  */
+HAL_IWDG_StateTypeDef HAL_IWDG_GetState(IWDG_HandleTypeDef *hiwdg)
+{
+  return hiwdg->State;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#endif /* HAL_IWDG_MODULE_ENABLED */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/