/**
******************************************************************************
* @file stm32f1xx_ll_wwdg.h
* @author MCD Application Team
* @brief Header file of WWDG LL module.
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2016 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
*
******************************************************************************
*/
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef STM32F1xx_LL_WWDG_H
#define STM32F1xx_LL_WWDG_H
#ifdef __cplusplus
extern "C" {
#endif
/* Includes ------------------------------------------------------------------*/
#include "stm32f1xx.h"
/** @addtogroup STM32F1xx_LL_Driver
* @{
*/
#if defined (WWDG)
/** @defgroup WWDG_LL WWDG
* @{
*/
/* Private types -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private constants ---------------------------------------------------------*/
/* Private macros ------------------------------------------------------------*/
/* Exported types ------------------------------------------------------------*/
/* Exported constants --------------------------------------------------------*/
/** @defgroup WWDG_LL_Exported_Constants WWDG Exported Constants
* @{
*/
/** @defgroup WWDG_LL_EC_IT IT Defines
* @brief IT defines which can be used with LL_WWDG_ReadReg and LL_WWDG_WriteReg functions
* @{
*/
#define LL_WWDG_CFR_EWI WWDG_CFR_EWI
/**
* @}
*/
/** @defgroup WWDG_LL_EC_PRESCALER PRESCALER
* @{
*/
#define LL_WWDG_PRESCALER_1 0x00000000u /*!< WWDG counter clock = (PCLK1/4096)/1 */
#define LL_WWDG_PRESCALER_2 WWDG_CFR_WDGTB_0 /*!< WWDG counter clock = (PCLK1/4096)/2 */
#define LL_WWDG_PRESCALER_4 WWDG_CFR_WDGTB_1 /*!< WWDG counter clock = (PCLK1/4096)/4 */
#define LL_WWDG_PRESCALER_8 (WWDG_CFR_WDGTB_0 | WWDG_CFR_WDGTB_1) /*!< WWDG counter clock = (PCLK1/4096)/8 */
/**
* @}
*/
/**
* @}
*/
/* Exported macro ------------------------------------------------------------*/
/** @defgroup WWDG_LL_Exported_Macros WWDG Exported Macros
* @{
*/
/** @defgroup WWDG_LL_EM_WRITE_READ Common Write and read registers macros
* @{
*/
/**
* @brief Write a value in WWDG register
* @param __INSTANCE__ WWDG Instance
* @param __REG__ Register to be written
* @param __VALUE__ Value to be written in the register
* @retval None
*/
#define LL_WWDG_WriteReg(__INSTANCE__, __REG__, __VALUE__) WRITE_REG(__INSTANCE__->__REG__, (__VALUE__))
/**
* @brief Read a value in WWDG register
* @param __INSTANCE__ WWDG Instance
* @param __REG__ Register to be read
* @retval Register value
*/
#define LL_WWDG_ReadReg(__INSTANCE__, __REG__) READ_REG(__INSTANCE__->__REG__)
/**
* @}
*/
/**
* @}
*/
/* Exported functions --------------------------------------------------------*/
/** @defgroup WWDG_LL_Exported_Functions WWDG Exported Functions
* @{
*/
/** @defgroup WWDG_LL_EF_Configuration Configuration
* @{
*/
/**
* @brief Enable Window Watchdog. The watchdog is always disabled after a reset.
* @note It is enabled by setting the WDGA bit in the WWDG_CR register,
* then it cannot be disabled again except by a reset.
* This bit is set by software and only cleared by hardware after a reset.
* When WDGA = 1, the watchdog can generate a reset.
* @rmtoll CR WDGA LL_WWDG_Enable
* @param WWDGx WWDG Instance
* @retval None
*/
__STATIC_INLINE void LL_WWDG_Enable(WWDG_TypeDef *WWDGx)
{
SET_BIT(WWDGx->CR, WWDG_CR_WDGA);
}
/**
* @brief Checks if Window Watchdog is enabled
* @rmtoll CR WDGA LL_WWDG_IsEnabled
* @param WWDGx WWDG Instance
* @retval State of bit (1 or 0).
*/
__STATIC_INLINE uint32_t LL_WWDG_IsEnabled(WWDG_TypeDef *WWDGx)
{
return ((READ_BIT(WWDGx->CR, WWDG_CR_WDGA) == (WWDG_CR_WDGA)) ? 1UL : 0UL);
}
/**
* @brief Set the Watchdog counter value to provided value (7-bits T[6:0])
* @note When writing to the WWDG_CR register, always write 1 in the MSB b6 to avoid generating an immediate reset
* This counter is decremented every (4096 x 2expWDGTB) PCLK cycles
* A reset is produced when it rolls over from 0x40 to 0x3F (bit T6 becomes cleared)
* Setting the counter lower then 0x40 causes an immediate reset (if WWDG enabled)
* @rmtoll CR T LL_WWDG_SetCounter
* @param WWDGx WWDG Instance
* @param Counter 0..0x7F (7 bit counter value)
* @retval None
*/
__STATIC_INLINE void LL_WWDG_SetCounter(WWDG_TypeDef *WWDGx, uint32_t Counter)
{
MODIFY_REG(WWDGx->CR, WWDG_CR_T, Counter);
}
/**
* @brief Return current Watchdog Counter Value (7 bits counter value)
* @rmtoll CR T LL_WWDG_GetCounter
* @param WWDGx WWDG Instance
* @retval 7 bit Watchdog Counter value
*/
__STATIC_INLINE uint32_t LL_WWDG_GetCounter(WWDG_TypeDef *WWDGx)
{
return (READ_BIT(WWDGx->CR, WWDG_CR_T));
}
/**
* @brief Set the time base of the prescaler (WDGTB).
* @note Prescaler is used to apply ratio on PCLK clock, so that Watchdog counter
* is decremented every (4096 x 2expWDGTB) PCLK cycles
* @rmtoll CFR WDGTB LL_WWDG_SetPrescaler
* @param WWDGx WWDG Instance
* @param Prescaler This parameter can be one of the following values:
* @arg @ref LL_WWDG_PRESCALER_1
* @arg @ref LL_WWDG_PRESCALER_2
* @arg @ref LL_WWDG_PRESCALER_4
* @arg @ref LL_WWDG_PRESCALER_8
* @retval None
*/
__STATIC_INLINE void LL_WWDG_SetPrescaler(WWDG_TypeDef *WWDGx, uint32_t Prescaler)
{
MODIFY_REG(WWDGx->CFR, WWDG_CFR_WDGTB, Prescaler);
}
/**
* @brief Return current Watchdog Prescaler Value
* @rmtoll CFR WDGTB LL_WWDG_GetPrescaler
* @param WWDGx WWDG Instance
* @retval Returned value can be one of the following values:
* @arg @ref LL_WWDG_PRESCALER_1
* @arg @ref LL_WWDG_PRESCALER_2
* @arg @ref LL_WWDG_PRESCALER_4
* @arg @ref LL_WWDG_PRESCALER_8
*/
__STATIC_INLINE uint32_t LL_WWDG_GetPrescaler(WWDG_TypeDef *WWDGx)
{
return (READ_BIT(WWDGx->CFR, WWDG_CFR_WDGTB));
}
/**
* @brief Set the Watchdog Window value to be compared to the downcounter (7-bits W[6:0]).
* @note This window value defines when write in the WWDG_CR register
* to program Watchdog counter is allowed.
* Watchdog counter value update must occur only when the counter value
* is lower than the Watchdog window register value.
* Otherwise, a MCU reset is generated if the 7-bit Watchdog counter value
* (in the control register) is refreshed before the downcounter has reached
* the watchdog window register value.
* Physically is possible to set the Window lower then 0x40 but it is not recommended.
* To generate an immediate reset, it is possible to set the Counter lower than 0x40.
* @rmtoll CFR W LL_WWDG_SetWindow
* @param WWDGx WWDG Instance
* @param Window 0x00..0x7F (7 bit Window value)
* @retval None
*/
__STATIC_INLINE void LL_WWDG_SetWindow(WWDG_TypeDef *WWDGx, uint32_t Window)
{
MODIFY_REG(WWDGx->CFR, WWDG_CFR_W, Window);
}
/**
* @brief Return current Watchdog Window Value (7 bits value)
* @rmtoll CFR W LL_WWDG_GetWindow
* @param WWDGx WWDG Instance
* @retval 7 bit Watchdog Window value
*/
__STATIC_INLINE uint32_t LL_WWDG_GetWindow(WWDG_TypeDef *WWDGx)
{
return (READ_BIT(WWDGx->CFR, WWDG_CFR_W));
}
/**
* @}
*/
/** @defgroup WWDG_LL_EF_FLAG_Management FLAG_Management
* @{
*/
/**
* @brief Indicates if the WWDG Early Wakeup Interrupt Flag is set or not.
* @note This bit is set by hardware when the counter has reached the value 0x40.
* It must be cleared by software by writing 0.
* A write of 1 has no effect. This bit is also set if the interrupt is not enabled.
* @rmtoll SR EWIF LL_WWDG_IsActiveFlag_EWKUP
* @param WWDGx WWDG Instance
* @retval State of bit (1 or 0).
*/
__STATIC_INLINE uint32_t LL_WWDG_IsActiveFlag_EWKUP(WWDG_TypeDef *WWDGx)
{
return ((READ_BIT(WWDGx->SR, WWDG_SR_EWIF) == (WWDG_SR_EWIF)) ? 1UL : 0UL);
}
/**
* @brief Clear WWDG Early Wakeup Interrupt Flag (EWIF)
* @rmtoll SR EWIF LL_WWDG_ClearFlag_EWKUP
* @param WWDGx WWDG Instance
* @retval None
*/
__STATIC_INLINE void LL_WWDG_ClearFlag_EWKUP(WWDG_TypeDef *WWDGx)
{
WRITE_REG(WWDGx->SR, ~WWDG_SR_EWIF);
}
/**
* @}
*/
/** @defgroup WWDG_LL_EF_IT_Management IT_Management
* @{
*/
/**
* @brief Enable the Early Wakeup Interrupt.
* @note When set, an interrupt occurs whenever the counter reaches value 0x40.
* This interrupt is only cleared by hardware after a reset
* @rmtoll CFR EWI LL_WWDG_EnableIT_EWKUP
* @param WWDGx WWDG Instance
* @retval None
*/
__STATIC_INLINE void LL_WWDG_EnableIT_EWKUP(WWDG_TypeDef *WWDGx)
{
SET_BIT(WWDGx->CFR, WWDG_CFR_EWI);
}
/**
* @brief Check if Early Wakeup Interrupt is enabled
* @rmtoll CFR EWI LL_WWDG_IsEnabledIT_EWKUP
* @param WWDGx WWDG Instance
* @retval State of bit (1 or 0).
*/
__STATIC_INLINE uint32_t LL_WWDG_IsEnabledIT_EWKUP(WWDG_TypeDef *WWDGx)
{
return ((READ_BIT(WWDGx->CFR, WWDG_CFR_EWI) == (WWDG_CFR_EWI)) ? 1UL : 0UL);
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
#endif /* WWDG */
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif /* STM32F1xx_LL_WWDG_H */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/