STM32L151 RTC报警中断

时间:2016-09-06 09:33:40

标签: microcontroller interrupt stm32 real-time-clock stm32l152

我遇到STM32L151的RTC报警中断问题。我希望我的程序每秒都进入RTC警报中断,但它不起作用。 我的主要功能:

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_IWDG_Init();
  MX_RTC_Init();
  MX_SPI1_Init();
  MX_USART1_UART_Init();

  __HAL_RTC_ALARM_ENABLE_IT(&hrtc, RTC_IT_ALRA);

  while (1)
  {

  }
}

功能配置RTC:MX_RTC_Init():

void MX_RTC_Init(void)
{
  RTC_TimeTypeDef sTime;
  RTC_DateTypeDef sDate;
  RTC_AlarmTypeDef sAlarm;

  hrtc.Instance = RTC;
  hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
  hrtc.Init.AsynchPrediv = 127;
  hrtc.Init.SynchPrediv = 255;
  hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
  hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
  hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
  HAL_RTC_Init(&hrtc);

  sTime.Hours = 0x14;
  sTime.Minutes = 0;
  sTime.Seconds = 0;
  sTime.TimeFormat = RTC_HOURFORMAT12_AM;
  sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
  sTime.StoreOperation = RTC_STOREOPERATION_RESET;
  HAL_RTC_SetTime(&hrtc, &sTime, FORMAT_BCD);

  sDate.WeekDay = RTC_WEEKDAY_WEDNESDAY;
  sDate.Month = RTC_MONTH_AUGUST;
  sDate.Date = 0x24;
  sDate.Year = 0x16;

  HAL_RTC_SetDate(&hrtc, &sDate, FORMAT_BCD);

    /**Enable the Alarm A 
    */
  sAlarm.AlarmTime.Hours = 0;
  sAlarm.AlarmTime.Minutes = 0;
  sAlarm.AlarmTime.Seconds = 0;
  sAlarm.AlarmTime.TimeFormat = RTC_HOURFORMAT12_AM;
  sAlarm.AlarmTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
  sAlarm.AlarmTime.StoreOperation = RTC_STOREOPERATION_RESET;
  sAlarm.AlarmMask = RTC_ALARMMASK_SECONDS;
  sAlarm.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE;
  sAlarm.AlarmDateWeekDay = 1;
  sAlarm.Alarm = RTC_ALARM_A;
  HAL_RTC_SetAlarm_IT(&hrtc, &sAlarm, FORMAT_BCD);

}

我使用CubeMX创建了项目。你对我有什么想法或建议吗?谢谢

2 个答案:

答案 0 :(得分:4)

如果屏蔽某个字段,则在检查警报日期时不会比较该字段。因此,当您屏蔽SECONDS时,只会比较DAY,HOUR和MINUTE字段。 使用RTC实现1秒中断的正确方法是使用所有警报掩码,因为这样就不会比较任何字段,并且当RTC递增SECOND字段时,将生成警报中断。

sAlarm.AlarmMask = RTC_ALARMMASK_ALL;

所有这些都由ST在他们的Using the hardware real-time clock (RTC) in STM32 F0, F2, F3, F4 and L1 series of MCUs申请说明中描述。

enter image description here

这是一个非常方便的解决方案,因为您不必在所有中断后重置警报。

答案 1 :(得分:1)

当您设置sAlarm.AlarmMask = RTC_ALARMMASK_SECONDS时,如果时间的秒值与sAlarm.AlarmTime.Seconds匹配,则RTC将生成中断,在您的情况下为0。因此,如果您保留代码,则每分钟都会有一个中断。

如果您希望每秒进行一次中断,则必须在中断处理程序中使用下一秒再次设置警报。中断处理程序中的代码如下所示:

void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
{
    RTC_TimeTypeDef sTime;
    HAL_RTC_GetTime(&hrtc, &sTime, RTC_FORMAT_BIN);
    uint8_t next_second = sTime.Seconds++;
    if (next_second > 59) next_second = 0;

    RTC_AlarmTypeDef sAlarm;
    sAlarm.AlarmTime.Hours = 0;
    sAlarm.AlarmTime.Minutes = 0;
    sAlarm.AlarmTime.Seconds = RTC_ByteToBcd2(next_second);
    sAlarm.AlarmTime.TimeFormat = RTC_HOURFORMAT12_AM;
    sAlarm.AlarmTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
    sAlarm.AlarmTime.StoreOperation = RTC_STOREOPERATION_RESET;
    sAlarm.AlarmMask = RTC_ALARMMASK_SECONDS;
    sAlarm.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE;
    sAlarm.AlarmDateWeekDay = 1;
    sAlarm.Alarm = RTC_ALARM_A;
    HAL_RTC_SetAlarm_IT(&hrtc, &sAlarm, FORMAT_BCD);
}

为此,您必须确保已正确设置RTC时钟(内部或外部32K)。

或者你可以使用RTC的唤醒功能,我觉得更合适。 或者在主循环中,您可以使用HAL_GetTick检查自上次处理以来已经过了1秒,如下所示:

static uint32_t last_second = 0;
void main(void)
{
   uint32_t current_second = HAL_GetTick();
   if (current_second - last_second > 1000)
   {
       last_second = current_second;

       //1 second has elapsed, do something
   }
}