text: /**
    ******************************************************************************
    * @file    stm32f0xx_hal_iwdg.h
    * @author  MCD Application Team
    * @version V1.2.0
    * @date    11-December-2014
    * @brief   Header file of IWDG HAL module.
    ******************************************************************************
    * @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.
    *
    ******************************************************************************  
    */
  
  /* Define to prevent recursive inclusion -------------------------------------*/
  #ifndef __STM32F0xx_HAL_IWDG_H
  #define __STM32F0xx_HAL_IWDG_H
  
  #ifdef __cplusplus
   extern "C" {
  #endif
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32f0xx_hal_def.h"
  
  /** @addtogroup STM32F0xx_HAL_Driver
    * @{
    */
  
  /** @addtogroup IWDG
    * @{
    */ 
  
  /* Exported types ------------------------------------------------------------*/ 
  
  /** @defgroup IWDG_Exported_Types IWDG Exported Types
    * @{
    */
  
  /** 
    * @brief  IWDG HAL State Structure definition  
    */ 
  typedef enum
  {
    HAL_IWDG_STATE_RESET          = 0x00,   /*!< IWDG not yet initialized or disabled */
    HAL_IWDG_STATE_READY          = 0x01,    /*!< IWDG initialized and ready for use */
    HAL_IWDG_STATE_BUSY           = 0x02,    /*!< IWDG internal process is ongoing   */ 
    HAL_IWDG_STATE_TIMEOUT        = 0x03,    /*!< IWDG timeout state                 */
    HAL_IWDG_STATE_ERROR          = 0x04     /*!< IWDG error state                   */     
  
  }HAL_IWDG_StateTypeDef;
  
  /** 
    * @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 */
    
    HAL_LockTypeDef                Lock;      /*!< IWDG Locking object      */
    
    __IO HAL_IWDG_StateTypeDef     State;     /*!< IWDG communication state */
  
  }IWDG_HandleTypeDef;
  
  /**
    * @}
    */
  
  /* Exported constants --------------------------------------------------------*/
  
  /** @defgroup IWDG_Exported_Constants IWDG Exported Constants
    * @{
    */
  
  /** @defgroup IWDG_Registers_BitMask IWDG Registers BitMask
    * @brief IWDG registers bit mask
    * @{
    */  
  /* --- KR Register ---*/
  /* KR register bit mask */
  #define KR_KEY_RELOAD           ((uint32_t)0xAAAA)  /*!< IWDG Reload Counter Enable   */
  #define KR_KEY_ENABLE           ((uint32_t)0xCCCC)  /*!< IWDG Peripheral Enable       */
  #define KR_KEY_EWA              ((uint32_t)0x5555)  /*!< IWDG KR Write Access Enable  */
  #define KR_KEY_DWA              ((uint32_t)0x0000)  /*!< IWDG KR Write Access Disable */
  
  #define IS_IWDG_KR(__KR__) (((__KR__) == KR_KEY_RELOAD) || \
                              ((__KR__) == KR_KEY_ENABLE))|| \
                              ((__KR__) == KR_KEY_EWA))   || \
                              ((__KR__) == KR_KEY_DWA))
  /**
    * @}
    */
    
  /** @defgroup IWDG_Flag_definition IWDG Flag definition
    * @{
    */ 
  #define IWDG_FLAG_PVU   ((uint32_t)IWDG_SR_PVU)  /*!< Watchdog counter prescaler value update Flag */
  #define IWDG_FLAG_RVU   ((uint32_t)IWDG_SR_RVU)  /*!< Watchdog counter reload value update Flag    */
  #define IWDG_FLAG_WVU   ((uint32_t)IWDG_SR_WVU)  /*!< Watchdog counter window value update Flag    */
  
  /**
    * @}
    */
  
  /** @defgroup IWDG_Prescaler IWDG Prescaler
    * @{
    */ 
  #define IWDG_PRESCALER_4            ((uint8_t)0x00)  /*!< IWDG prescaler set to 4   */
  #define IWDG_PRESCALER_8     ((uint8_t)(IWDG_PR_PR_0))                  /*!< IWDG prescaler set to 8   */
  #define IWDG_PRESCALER_16    ((uint8_t)(IWDG_PR_PR_1))                  /*!< IWDG prescaler set to 16  */
  #define IWDG_PRESCALER_32    ((uint8_t)(IWDG_PR_PR_1 | IWDG_PR_PR_0))   /*!< IWDG prescaler set to 32  */
  #define IWDG_PRESCALER_64    ((uint8_t)(IWDG_PR_PR_2))                  /*!< IWDG prescaler set to 64  */
  #define IWDG_PRESCALER_128   ((uint8_t)(IWDG_PR_PR_2 | IWDG_PR_PR_0))   /*!< IWDG prescaler set to 128 */
  #define IWDG_PRESCALER_256   ((uint8_t)(IWDG_PR_PR_2 | IWDG_PR_PR_1))   /*!< IWDG prescaler set to 256 */
  
  #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))
  
  /**
    * @}
    */
  
  /** @defgroup IWDG_Reload_Value IWDG Reload Value
    * @{
    */ 
  #define IS_IWDG_RELOAD(__RELOAD__) ((__RELOAD__) <= 0xFFF)
  /**
    * @}
    */
  
  /** @defgroup IWDG_CounterWindow_Value IWDG CounterWindow Value
    * @{
    */
  #define IS_IWDG_WINDOW(__VALUE__) ((__VALUE__) <= 0xFFF)
  /**
    * @}
    */ 
  /** @defgroup IWDG_Window_option IWDG Window option
    * @{
    */
  #define IWDG_WINDOW_DISABLE    0xFFF
  /**
    * @}
    */ 
  
  /**
    * @}
    */
  
  /* Exported macros -----------------------------------------------------------*/
  
  /** @defgroup IWDG_Exported_Macros IWDG Exported Macros
   * @{
   */
  
  /** @brief  Reset IWDG handle state
    * @param  __HANDLE__: IWDG handle.
    * @retval None
    */
  #define __HAL_IWDG_RESET_HANDLE_STATE(__HANDLE__) ((__HANDLE__)->State = HAL_IWDG_STATE_RESET)
  
  /**
    * @brief  Enables the IWDG peripheral.
    * @param  __HANDLE__: IWDG handle
    * @retval None
    */
  #define __HAL_IWDG_START(__HANDLE__)                WRITE_REG((__HANDLE__)->Instance->KR, KR_KEY_ENABLE)
  
  /**
    * @brief  Reloads IWDG counter with value defined in the reload register
    *         (write access to IWDG_PR and IWDG_RLR registers disabled).
    * @param  __HANDLE__: IWDG handle
    * @retval None
    */
  #define __HAL_IWDG_RELOAD_COUNTER(__HANDLE__)       WRITE_REG((__HANDLE__)->Instance->KR, KR_KEY_RELOAD)
  
  /**
    * @brief  Enable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers.
    * @param  __HANDLE__: IWDG handle
    * @retval None
    */
  #define __HAL_IWDG_ENABLE_WRITE_ACCESS(__HANDLE__)  WRITE_REG((__HANDLE__)->Instance->KR, KR_KEY_EWA)
  
  /**
    * @brief  Disable write access to IWDG_PR, IWDG_RLR and IWDG_WINR registers.
    * @param  __HANDLE__: IWDG handle
    * @retval None
    */
  #define __HAL_IWDG_DISABLE_WRITE_ACCESS(__HANDLE__) WRITE_REG((__HANDLE__)->Instance->KR, KR_KEY_DWA)
  
  /**
    * @brief  Gets the selected IWDG's flag status.
    * @param  __HANDLE__: IWDG handle
    * @param  __FLAG__: specifies the flag to check.
    *         This parameter can be one of the following values:
    *            @arg IWDG_FLAG_PVU:  Watchdog counter reload value update flag
    *            @arg IWDG_FLAG_RVU:  Watchdog counter prescaler value flag
    *            @arg IWDG_FLAG_WVU:  Watchdog counter window value flag
    * @retval The new state of __FLAG__ (TRUE or FALSE).
    */
  #define __HAL_IWDG_GET_FLAG(__HANDLE__, __FLAG__) (((__HANDLE__)->Instance->SR & (__FLAG__)) == (__FLAG__))
  
  /**
    * @}
    */
  
  /* Exported functions --------------------------------------------------------*/
  
  /** @addtogroup IWDG_Exported_Functions
    * @{
    */
  
  /** @addtogroup IWDG_Exported_Functions_Group1
    * @{
    */
  /* Initialization/de-initialization functions  ********************************/
  HAL_StatusTypeDef HAL_IWDG_Init(IWDG_HandleTypeDef *hiwdg);
  void HAL_IWDG_MspInit(IWDG_HandleTypeDef *hiwdg);
  
  /**
    * @}
    */
    
  /** @addtogroup IWDG_Exported_Functions_Group2
    * @{
    */
  /* I/O operation functions ****************************************************/
  HAL_StatusTypeDef HAL_IWDG_Start(IWDG_HandleTypeDef *hiwdg);
  HAL_StatusTypeDef HAL_IWDG_Refresh(IWDG_HandleTypeDef *hiwdg);
  
  /**
    * @}
    */
    
  /** @addtogroup IWDG_Exported_Functions_Group3
    * @{
    */
  /* Peripheral State functions  ************************************************/
  HAL_IWDG_StateTypeDef HAL_IWDG_GetState(IWDG_HandleTypeDef *hiwdg);
  
  /**
    * @}
    */ 
  
  /**
    * @}
    */ 
  
  /**
    * @}
    */ 
  
  /**
    * @}
    */ 
    
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* __STM32F0xx_HAL_IWDG_H */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  
  