rt-thread/bsp/stm32l475-iot-disco/Libraries/STM32L4xx_HAL_Driver/Inc/stm32l4xx_hal_iwdg.h

/**
  ******************************************************************************
  * @file    stm32l4xx_hal_iwdg.h
  * @author  MCD Application Team
  * @version V1.7.2
  * @date    16-June-2017
  * @brief   Header file of IWDG HAL module.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2017 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 __STM32L4xx_HAL_IWDG_H
#define __STM32L4xx_HAL_IWDG_H

#ifdef __cplusplus
 extern "C" {
#endif

/* Includes ------------------------------------------------------------------*/
#include "stm32l4xx_hal_def.h"

/** @addtogroup STM32L4xx_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 & 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 /* __STM32L4xx_HAL_IWDG_H */

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