STM32 硬件看门狗 IWDG 的时间设置

事例代码：

//配置硬件看门狗
void IWDG_Configuration(void)
{
  //喂狗标记
  extern u8 isReloadIWDG;

  //将看门狗的复位实现设置为 3276.8 ms

  /* Enable write access to IWDG_PR and IWDG_RLR registers */
  IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);

  /* IWDG counter clock: 40KHz(LSI) / 32 = 1.25 KHz */
  IWDG_SetPrescaler(IWDG_Prescaler_32);

  /* Set counter reload value to 0x0fff */
  IWDG_SetReload(0x0fff);

  /* Reload IWDG counter */
  IWDG_ReloadCounter();

  /* Enable IWDG (the LSI oscillator will be enabled by hardware) */
  IWDG_Enable();

  //喂狗标记
  isReloadIWDG=0x08;
}