[HAL库学习之路]6.WWDG-窗口看门狗

记录自己的STM32的HAL库的学习之路，不定期更新…

一、Pinout

二、Clock Configuration

三、Configuration

配置GPIO

配置WWDG

配置NVIC

超时时间:

T=4096∗Prescaler∗(T[5:0]+1)/Fpclk

Prescaler为WWDG的预分频系数，Fpclk为APB1时钟，T[5:0]为窗口看门狗的计数器低6位。

四、Generate Code

代码
窗口看门狗的上窗口为0x5f,在计数器为0x7f至0x5f之间喂狗程序复位，使能提前唤醒中断，计数器减至0x40会产生一个中断，在中断完成喂狗及翻转PF10。

int main(void)
{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration----------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_WWDG_Init();

  /* USER CODE BEGIN 2 */
    HAL_GPIO_WritePin(GPIOF,GPIO_PIN_9,GPIO_PIN_RESET);
    HAL_Delay(24);
    HAL_WWDG_Refresh(&hwwdg);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */

  }
  /* USER CODE END 3 */

}

void HAL_WWDG_EarlyWakeupCallback(WWDG_HandleTypeDef* hwwdg)
{
    static uint8_t state = 0;
    HAL_WWDG_Refresh(hwwdg);
    HAL_GPIO_WritePin(GPIOF,GPIO_PIN_10,state);
    state = !state;
}