stm32f4xx_wwdg.c

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/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_wwdg.h"
#include "stm32f4xx_rcc.h"

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

/* ----------- WWDG registers bit address in the alias region ----------- */
#define WWDG_OFFSET       (WWDG_BASE - PERIPH_BASE)
/* Alias word address of EWI bit */
#define CFR_OFFSET        (WWDG_OFFSET + 0x04)
#define EWI_BitNumber     0x09
#define CFR_EWI_BB        (PERIPH_BB_BASE + (CFR_OFFSET * 32) + (EWI_BitNumber * 4))

/* --------------------- WWDG registers bit mask ------------------------ */
/* CFR register bit mask */
#define CFR_WDGTB_MASK    ((uint32_t)0xFFFFFE7F)
#define CFR_W_MASK        ((uint32_t)0xFFFFFF80)
#define BIT_MASK          ((uint8_t)0x7F)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

void WWDG_DeInit(void)
{
  RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, ENABLE);
  RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, DISABLE);
}

void WWDG_SetPrescaler(uint32_t WWDG_Prescaler)
{
  uint32_t tmpreg = 0;
  /* Check the parameters */
  assert_param(IS_WWDG_PRESCALER(WWDG_Prescaler));
  /* Clear WDGTB[1:0] bits */
  tmpreg = WWDG->CFR & CFR_WDGTB_MASK;
  /* Set WDGTB[1:0] bits according to WWDG_Prescaler value */
  tmpreg |= WWDG_Prescaler;
  /* Store the new value */
  WWDG->CFR = tmpreg;
}

void WWDG_SetWindowValue(uint8_t WindowValue)
{
  __IO uint32_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_WWDG_WINDOW_VALUE(WindowValue));
  /* Clear W[6:0] bits */

  tmpreg = WWDG->CFR & CFR_W_MASK;

  /* Set W[6:0] bits according to WindowValue value */
  tmpreg |= WindowValue & (uint32_t) BIT_MASK;

  /* Store the new value */
  WWDG->CFR = tmpreg;
}

void WWDG_EnableIT(void)
{
  *(__IO uint32_t *) CFR_EWI_BB = (uint32_t)ENABLE;
}

void WWDG_SetCounter(uint8_t Counter)
{
  /* Check the parameters */
  assert_param(IS_WWDG_COUNTER(Counter));
  /* Write to T[6:0] bits to configure the counter value, no need to do
     a read-modify-write; writing a 0 to WDGA bit does nothing */
  WWDG->CR = Counter & BIT_MASK;
}
void WWDG_Enable(uint8_t Counter)
{
  /* Check the parameters */
  assert_param(IS_WWDG_COUNTER(Counter));
  WWDG->CR = WWDG_CR_WDGA | Counter;
}
FlagStatus WWDG_GetFlagStatus(void)
{
  FlagStatus bitstatus = RESET;
    
  if ((WWDG->SR) != (uint32_t)RESET)
  {
    bitstatus = SET;
  }
  else
  {
    bitstatus = RESET;
  }
  return bitstatus;
}

void WWDG_ClearFlag(void)
{
  WWDG->SR = (uint32_t)RESET;
}

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