STM32F042 RTC中断问题

只看该作者 · 2018-1-29 19:10

各位，小弟刚接触Cortex-M0核单片机，用的是STM32F042.在使用RTC Alarm功能时，遇到问题，先贴源码

//初始化
void RTC_init(void)
{
      RTC_InitTypeDef RTC_InitStructure;
      EXTI_InitTypeDef EXTI_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      //Enable the LSI OSC
      RCC_LSICmd(ENABLE);
      while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
      {
      }
      //40k
      RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
      RCC_RTCCLKCmd(ENABLE);
      RTC_WaitForSynchro();

      //时基配置-1s
      RTC_InitStructure.RTC_AsynchPrediv = 0x63;
      RTC_InitStructure.RTC_SynchPrediv = 0x18F;
      RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;

      RTC_Init(&RTC_InitStructure);

      EXTI_ClearITPendingBit(EXTI_Line17);
      EXTI_InitStructure.EXTI_Line = EXTI_Line17;
      EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
      EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
      EXTI_InitStructure.EXTI_LineCmd = ENABLE;
      EXTI_Init(&EXTI_InitStructure);

      NVIC_InitStructure.NVIC_IRQChannel = RTC_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPriority = 2;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);
}

//校准时钟为: 00:01:00
void RTC_TimeRegulate(void)
{
      RTC_TimeTypeDef RTC_TimeStructure;

      RTC_TimeStructure.RTC_H12 = RTC_H12_AM;
      RTC_TimeStructure.RTC_Hours = 0x00;
      RTC_TimeStructure.RTC_Minutes = 0x01;
      RTC_TimeStructure.RTC_Seconds = 0x00;

      RTC_SetTime(RTC_Format_BIN, &RTC_TimeStructure);
}

//闹钟设置
void RTC_TimeAlarm(u8 tInterval)
{
      RTC_AlarmTypeDef  RTC_AlarmStructure;

      RTC_AlarmStructure.RTC_AlarmTime.RTC_H12 = RTC_H12_AM;
      RTC_AlarmStructure.RTC_AlarmTime.RTC_Minutes = tInterval;

      //屏蔽天数、小时和秒
      RTC_AlarmStructure.RTC_AlarmMask = RTC_AlarmMask_DateWeekDay|RTC_AlarmMask_Hours|RTC_AlarmMask_Seconds;
      RTC_SetAlarm(RTC_Format_BIN, RTC_Alarm_A, &RTC_AlarmStructure);

      //中断
      RTC_ITConfig(RTC_IT_ALRA, ENABLE);
      RTC_AlarmCmd(RTC_Alarm_A, ENABLE);
}

int main(void)
{
      RTC_init();
      RTC_TimeRegulate();
      //1min中断一次
      RTC_TimeAlarm(0x01);
      while(1);
}

void RTC_IRQHandler(void)
{
      RTC_ClearITPendingBit(RTC_IT_ALRA);
   EXTI_ClearITPendingBit(EXTI_Line17);
      //...
}

实现的功能是：1min进一次RTC中断处理业务。但是运行的结果是进不了中断！

请各位帮忙看看问题出在哪里？谢谢

只看该作者 · 2018-1-29 19:32

1min中断还是1S中断一次

只看该作者 · 2018-1-29 20:21

是1分钟（min）中断一次

1万 · 2018-1-29 21:49

官方有例程，你好好比对下配置。
比方你有无如下配置代码：
/* Enable the PWR clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

  /* Allow access to RTC */
  PWR_BackupAccessCmd(ENABLE);