RTC刚上电没有清除中断标志位不能进中断

taomao · 发表于 2020-4-18 10:37:04

本帖最后由 taomao 于 2020-4-18 11:48 编辑

void RTC_Set_WakeUp(u32 wksel,u16 cnt)
{
      EXTI_InitTypeDef EXTI_InitStructure;

      RTC_WakeUpCmd(DISABLE);//关闭WAKE UP

                              RTC_WakeUpClockConfig(wksel);//唤醒时钟选择

      RTC_SetWakeUpCounter(cnt);//       cnt个同步预分频频率

      //为什么芯片刚上电时中断标志位就置位了，中断函数里不是清除了吗
      RTC_ClearITPendingBit(RTC_IT_WUT); //清除RTC WAKE UP的标志在芯片刚上电时就有中断标志位了吗，
  EXTI_ClearITPendingBit(EXTI_Line22);//清除LINE22上的中断标志位

      RTC_ITConfig(RTC_IT_WUT,ENABLE);//开启WAKE UP 定时器中断
      RTC_WakeUpCmd( ENABLE);//开启WAKE UP 定时器　

      EXTI_InitStructure.EXTI_Line = EXTI_Line22;//LINE22
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//中断事件
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //上升沿触发
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;//使能LINE22
  EXTI_Init(&EXTI_InitStructure);//配置

      NVIC_InitStructure.NVIC_IRQChannel = RTC_WKUP_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;//抢占优先级1
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//子优先级2
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道
  NVIC_Init(&NVIC_InitStructure);//配置
}