rt-thread-official/bsp/ft32/libraries/FT32F0xx/FT32F0xx_Driver/Src/ft32f0xx_iwdg.c

/**
  ******************************************************************************
  * @file               ft32f0xx_iwdg.c
  * @author             FMD AE
  * @brief              This file provides firmware functions to manage the following
  *                     functionalities of the Independent watchdog (IWDG) peripheral:
  *                 + Prescaler and Counter configuration
  *                 + IWDG activation
  *                 + Flag management
  * @version            V1.0.0
  * @data                   2021-07-01
    ******************************************************************************
  */
/* Includes ------------------------------------------------------------------*/
#include "ft32f0xx_iwdg.h"

/* ---------------------- IWDG registers bit mask ----------------------------*/
/* KR register bit mask */
#define KR_KEY_RELOAD    ((uint16_t)0xAAAA)
#define KR_KEY_ENABLE    ((uint16_t)0xCCCC)


/**
  * @brief  Enables or disables write access to IWDG_PR and IWDG_RLR registers.
  * @param  IWDG_WriteAccess: new state of write access to IWDG_PR and IWDG_RLR registers.
  *          This parameter can be one of the following values:
  *            @arg IWDG_WriteAccess_Enable: Enable write access to IWDG_PR and IWDG_RLR registers
  *            @arg IWDG_WriteAccess_Disable: Disable write access to IWDG_PR and IWDG_RLR registers
  * @retval None
  */
void IWDG_WriteAccessCmd(uint16_t IWDG_WriteAccess)
{
  /* Check the parameters */
  assert_param(IS_IWDG_WRITE_ACCESS(IWDG_WriteAccess));
  IWDG->KR = IWDG_WriteAccess;
}

/**
  * @brief  Sets IWDG Prescaler value.
  * @param  IWDG_Prescaler: specifies the IWDG Prescaler value.
  *          This parameter can be one of the following values:
  *            @arg IWDG_Prescaler_4: IWDG prescaler set to 4
  *            @arg IWDG_Prescaler_8: IWDG prescaler set to 8
  *            @arg IWDG_Prescaler_16: IWDG prescaler set to 16
  *            @arg IWDG_Prescaler_32: IWDG prescaler set to 32
  *            @arg IWDG_Prescaler_64: IWDG prescaler set to 64
  *            @arg IWDG_Prescaler_128: IWDG prescaler set to 128
  *            @arg IWDG_Prescaler_256: IWDG prescaler set to 256
  * @retval None
  */
void IWDG_SetPrescaler(uint8_t IWDG_Prescaler)
{
  /* Check the parameters */
  assert_param(IS_IWDG_PRESCALER(IWDG_Prescaler));
  IWDG->PR = IWDG_Prescaler;
}

/**
  * @brief  Sets IWDG Reload value.
  * @param  Reload: specifies the IWDG Reload value.
  *          This parameter must be a number between 0 and 0x0FFF.
  * @retval None
  */
void IWDG_SetReload(uint16_t Reload)
{
  /* Check the parameters */
  assert_param(IS_IWDG_RELOAD(Reload));
  IWDG->RLR = Reload;
}

/**
  * @brief  Reloads IWDG counter with value defined in the reload register
  *   (write access to IWDG_PR and IWDG_RLR registers disabled).
  * @param  None
  * @retval None
  */
void IWDG_ReloadCounter(void)
{
  IWDG->KR = KR_KEY_RELOAD;
}


/**
  * @brief  Sets the IWDG window value.
  * @param  WindowValue: specifies the window value to be compared to the downcounter.
  * @retval None
  */
void IWDG_SetWindowValue(uint16_t WindowValue)
{
  /* Check the parameters */
  assert_param(IS_IWDG_WINDOW_VALUE(WindowValue));
  IWDG->WINR = WindowValue;
}

/**
  * @}
  */

/** @defgroup IWDG_Group2 IWDG activation function
 *  @brief   IWDG activation function
 *
@verbatim
 ==============================================================================
                          ##### IWDG activation function #####
 ==============================================================================

@endverbatim
  * @{
  */

/**
  * @brief  Enables IWDG (write access to IWDG_PR and IWDG_RLR registers disabled).
  * @param  None
  * @retval None
  */
void IWDG_Enable(void)
{
  IWDG->KR = KR_KEY_ENABLE;
}

/**
  * @}
  */

/**
  * @brief  Checks whether the specified IWDG flag is set or not.
  * @param  IWDG_FLAG: specifies the flag to check.
  *          This parameter can be one of the following values:
  *            @arg IWDG_FLAG_PVU: Prescaler Value Update on going
  *            @arg IWDG_FLAG_RVU: Reload Value Update on going
  *            @arg IWDG_FLAG_WVU: Counter Window Value Update on going
  * @retval The new state of IWDG_FLAG (SET or RESET).
  */
FlagStatus IWDG_GetFlagStatus(uint16_t IWDG_FLAG)
{
  FlagStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_IWDG_FLAG(IWDG_FLAG));
  if ((IWDG->SR & IWDG_FLAG) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  /* Return the flag status */
  return bitstatus;
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

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