关于STM32L053 RTC显示误差的问题

只看该作者 · 2014-11-27 08:41

最近在搞得一个项目要用到时间、日期显示，开启stm32内部RTC，但是发现一个问题，就是我显示的时间老是不准确

大概要比正常的时间晚1个半小时之多。

/*-------------------------配置RTC时钟----------------------------------------*/
void RTC_CLK_Config(void)
{
RCC_OscInitTypeDef       RCC_OscInitStruct;
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;

  /*##-1- Configue LSI as  RTC clock soucre ############################*/
RCC_OscInitStruct.OscillatorType =  RCC_OSCILLATORTYPE_LSE;//外部LSE时钟为RTC时钟源
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
HAL_RCC_OscConfig(&RCC_OscInitStruct);

PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);

  /*##-2- Enable RTC peripheral Clocks #######################################*/
  /* Enable RTC Clock */
__HAL_RCC_RTC_ENABLE();

}
/*------------------日期时间参数配置------------------------------------------*/
void RTC_Config(void)
{
// HAL_RTC_CLK_ENABLE();

RTC_CLK_Config();
  /*##-1- Configure the RTC peripheral #######################################*/
  /* Configure RTC prescaler and RTC data registers */
  /* RTC configured as follow:
   - Hour Format = Format 24
   - Asynch Prediv  = Value according to source clock
   - Synch Prediv = Value according to source clock
   - OutPut       = Output Disable
   - OutPutPolarity = High Polarity
   - OutPutType    = Open Drain */
  RtcHandle.Instance = RTC;
  RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
  RtcHandle.Init.AsynchPrediv = 0x7F;             // RTC_ASYNCH_PREDIV;
  RtcHandle.Init.SynchPrediv = 0x0130;          //RTC_SYNCH_PREDIV;
  RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
  RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
  RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;

  HAL_RTC_Init(&RtcHandle);

  /*##-2- Check if Data stored in BackUp register0: No Need to reconfigure RTC#*/
  /* Read the BackUp Register 0 Data */
  if(HAL_RTCEx_BKUPRead(&RtcHandle, RTC_BKP_DR0) != 0x32F2)
  {
/* Configure RTC Calendar */
RTC_CalendarConfig();
  }

}

大神给提提建议哪里出了问题？