01. WWDG概述
stm32f4xx_wwdg.h和 stm32f4xx_wwdg.c文件中。

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WWDG_Prescaler
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1. /** @defgroup WWDG_Prescaler
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2.   * @{
   
3.   */
   
4. 
   
5. #define WWDG_Prescaler_1    ((uint32_t)0x00000000)
   
6. #define WWDG_Prescaler_2    ((uint32_t)0x00000080)
   
7. #define WWDG_Prescaler_4    ((uint32_t)0x00000100)
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8. #define WWDG_Prescaler_8    ((uint32_t)0x00000180)
   
9. #define IS_WWDG_PRESCALER(PRESCALER) (((PRESCALER) == WWDG_Prescaler_1) || \
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10.                                       ((PRESCALER) == WWDG_Prescaler_2) || \
    
11.                                       ((PRESCALER) == WWDG_Prescaler_4) || \
    
12.                                       ((PRESCALER) == WWDG_Prescaler_8))
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13. #define IS_WWDG_WINDOW_VALUE(VALUE) ((VALUE) <= 0x7F)
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14. #define IS_WWDG_COUNTER(COUNTER) (((COUNTER) >= 0x40) && ((COUNTER) <= 0x7F))

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1.   WWDG_IRQn                   = 0,      /*!< Window WatchDog Interrupt*/

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03. 相关函数
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1. /*  Function used to set the WWDG configuration to the default reset state ****/  
   
2. void WWDG_DeInit(void);
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3. 
   
4. /* Prescaler, Refresh window and Counter configuration functions **************/
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5. void WWDG_SetPrescaler(uint32_t WWDG_Prescaler);
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6. void WWDG_SetWindowValue(uint8_t WindowValue);
   
7. void WWDG_EnableIT(void);
   
8. void WWDG_SetCounter(uint8_t Counter);
   
9. 
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10. /* WWDG activation function ***************************************************/
    
11. void WWDG_Enable(uint8_t Counter);
    
12. 
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13. /* Interrupts and flags management functions **********************************/
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14. FlagStatus WWDG_GetFlagStatus(void);
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15. void WWDG_ClearFlag(void);

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04. 结构体封装
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1. /**
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2.   * @brief Window WATCHDOG
   
3.   */
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4. 
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5. typedef struct
   
6. {
   
7.   __IO uint32_t CR;   /*!< WWDG Control register,       Address offset: 0x00 */
   
8.   __IO uint32_t CFR;  /*!< WWDG Configuration register, Address offset: 0x04 */
   
9.   __IO uint32_t SR;   /*!< WWDG Status register,        Address offset: 0x08 */
   
10. } WWDG_TypeDef;

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