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一、rtc的时钟有lse提供。

二、选择rtc唤醒与闹钟功能

内部参数介绍

闹钟配置

在配置时间时，注意将时间信息存储起来，防止复位后时间重新配置。

	if(HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR0)!= 0x55AA)//判断标志位是否配置过，没有则进入if进行配置	{			sTime.Hours = 0x23;sTime.Minutes = 0x59;sTime.Seconds = 0x55;sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;sTime.StoreOperation = RTC_STOREOPERATION_RESET;if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK){Error_Handler();}sDate.WeekDay = RTC_WEEKDAY_FRIDAY;sDate.Month = RTC_MONTH_OCTOBER;sDate.Date = 0x25;sDate.Year = 0x24;if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BCD) != HAL_OK){Error_Handler();}HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR0, 0x55AA);//写入标志位HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR1, sDate.Year );//写入标志位	HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR2, sDate.Date);//写入标志位HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR3, sDate.Month);//写入标志位	HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR4, sDate.WeekDay);//写入标志位HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR5, sTime.Hours);//写入标志位	HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR6, sTime.Minutes);//写入标志位HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR7, sTime.Seconds);//写入标志位	}/** Enable the Alarm A*/sAlarm.AlarmTime.Hours = 0x0;sAlarm.AlarmTime.Minutes = 0x0;sAlarm.AlarmTime.Seconds = 0x5;sAlarm.AlarmTime.SubSeconds = 0x0;sAlarm.AlarmTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;sAlarm.AlarmTime.StoreOperation = RTC_STOREOPERATION_RESET;sAlarm.AlarmMask = RTC_ALARMMASK_DATEWEEKDAY;//每天提示，当开启掩码功能只在设定的星期和日期提示sAlarm.AlarmSubSecondMask = RTC_ALARMSUBSECONDMASK_NONE;sAlarm.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE;//星期或日期sAlarm.AlarmDateWeekDay = 0x1;//日期sAlarm.Alarm = RTC_ALARM_A;if (HAL_RTC_SetAlarm_IT(&hrtc, &sAlarm, RTC_FORMAT_BCD) != HAL_OK){Error_Handler();}/** Enable the WakeUp*/if (HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 0, RTC_WAKEUPCLOCK_CK_SPRE_16BITS) != HAL_OK){Error_Handler();}

开启电源时钟

void HAL_RTC_MspInit(RTC_HandleTypeDef* rtcHandle)
{RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};if(rtcHandle->Instance==RTC){/* USER CODE BEGIN RTC_MspInit 0 */RCC_OscInitTypeDef RCC_OscInitStruct;__HAL_RCC_PWR_CLK_ENABLE();//使能电源时钟PWRHAL_PWR_EnableBkUpAccess();//取消备份区域写保护RCC_OscInitStruct.OscillatorType=RCC_OSCILLATORTYPE_LSE;//LSE配置RCC_OscInitStruct.PLL.PLLState=RCC_PLL_NONE;RCC_OscInitStruct.LSEState=RCC_LSE_ON;                  //RTC使用LSEHAL_RCC_OscConfig(&RCC_OscInitStruct);/* USER CODE END RTC_MspInit 0 */
...
}在复位函数中添加关闭时钟配置
void HAL_RTC_MspDeInit(RTC_HandleTypeDef* rtcHandle)
{if(rtcHandle->Instance==RTC){/* USER CODE BEGIN RTC_MspDeInit 0 *//* USER CODE END RTC_MspDeInit 0 *//* Peripheral clock disable */__HAL_RCC_RTC_DISABLE();/* RTC interrupt Deinit */HAL_NVIC_DisableIRQ(RTC_WKUP_IRQn);HAL_NVIC_DisableIRQ(RTC_Alarm_IRQn);/* USER CODE BEGIN RTC_MspDeInit 1 */HAL_PWR_DisableBkUpAccess();__HAL_RCC_PWR_CLK_DISABLE();/* USER CODE END RTC_MspDeInit 1 */}
}

在闹钟回调和唤醒回调中添加

//RTC闹钟A中断处理回调函数
void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
{printf("ALARM A!\r\n");
}
void HAL_RTCEx_WakeUpTimerEventCallback(RTC_HandleTypeDef *hrtc)
{RTC_TimeTypeDef RTC_TimeStruct;RTC_DateTypeDef RTC_DateStruct;uint8_t buf[40];HAL_RTC_GetTime(hrtc,&RTC_TimeStruct,RTC_FORMAT_BIN);sprintf((char*)buf,"Time: %02d:%02d:%02d",RTC_TimeStruct.Hours,RTC_TimeStruct.Minutes,RTC_TimeStruct.Seconds);printf("%s\r\n",buf);HAL_RTC_GetDate(hrtc,&RTC_DateStruct,RTC_FORMAT_BIN);sprintf((char*)buf,"Date: 20%02d-%02d-%02d  Day %d",RTC_DateStruct.Year,RTC_DateStruct.Month,RTC_DateStruct.Date,RTC_DateStruct.WeekDay);printf("%s\r\n",buf);	
}

闹钟正常提示

复位和掉电后时间依旧正常，没有进行重置