STM32RTC使用步驟：

打開PWR時鐘和Backup區(qū)數(shù)據(jù)訪問

若使用外部低速時鐘(LSE)，打開LSE并等待起振

選擇和打開RTC時鐘，等待時鐘同步

配置時間格式，分頻系數(shù)等

根據(jù)需要配置時鐘，日期，鬧鐘，喚醒，輸出，時間戳，備份寄存器等模塊

根據(jù)需要配置和打開中斷，其中

RTC Alarm ——EXTI line 17

RTC tamper and Timestamps——EXTI line 19

RTC wakeup——EXTI line 20

下面的代碼配置日期，時間，當(dāng)前時間設(shè)置為 15年05月31日，星期日(7)，15:50:40，打開鬧鐘A和喚醒中斷，每一秒鐘來一次中斷，15:50:45秒產(chǎn)生鬧鐘中斷，用串口打印相應(yīng)的信息。

代碼：

void RTC_Config(void)

{

RTC_TimeTypeDef RTC_TimeStructure;

RTC_DateTypeDef RTC_DateStructure;

RTC_InitTypeDef RTC_InitStructure;

RTC_AlarmTypeDef RTC_AlarmStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR,ENABLE);

PWR_BackupAccessCmd(ENABLE);

RCC_BackupResetCmd(ENABLE);

RCC_BackupResetCmd(DISABLE);

RCC_LSEConfig(RCC_LSE_ON);

while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET);

RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);

RCC_RTCCLKCmd(ENABLE);

RTC_WaitForSynchro();

RTC_InitStructure.RTC_HourFormat=RTC_HourFormat_24;

RTC_InitStructure.RTC_AsynchPrediv=0x7F;

RTC_InitStructure.RTC_SynchPrediv=0xFF;

RTC_Init(&RTC_InitStructure);

RTC_DateStructure.RTC_Date=31; // 15,05,31

RTC_DateStructure.RTC_Month=RTC_Month_May;

RTC_DateStructure.RTC_Year=15;

RTC_DateStructure.RTC_WeekDay=RTC_Weekday_Sunday;

RTC_SetDate(RTC_Format_BIN,&RTC_DateStructure);

RTC_TimeStructure.RTC_H12=RTC_H12_AM; // 15:50:40

RTC_TimeStructure.RTC_Hours=15;

RTC_TimeStructure.RTC_Minutes=50;

RTC_TimeStructure.RTC_Seconds=40;

RTC_SetTime(RTC_Format_BIN,&RTC_TimeStructure);

RTC_AlarmStructure.RTC_AlarmDateWeekDaySel=RTC_AlarmDateWeekDaySel_WeekDay;

RTC_AlarmStructure.RTC_AlarmDateWeekDay=RTC_Weekday_Sunday;

RTC_AlarmStructure.RTC_AlarmMask=RTC_AlarmMask_None;

RTC_AlarmStructure.RTC_AlarmTime=RTC_TimeStructure;// 15:50:40

RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds=45;// 15:50:45

RTC_SetAlarm(RTC_Format_BIN,RTC_Alarm_A,&RTC_AlarmStructure);

RTC_AlarmCmd(RTC_Alarm_A,ENABLE);

RTC_ITConfig(RTC_IT_ALRA,ENABLE);

RTC_ITConfig(RTC_IT_WUT,ENABLE);

RTC_WakeUpCmd(DISABLE);

RTC_WakeUpClockConfig(RTC_WakeUpClock_CK_SPRE_16bits);

RTC_SetWakeUpCounter(0);

RTC_WakeUpCmd(ENABLE);

}

void RTC_NvicExti_Config(void)

{

NVIC_InitTypeDef NVIC_InitStructure;

EXTI_InitTypeDef EXTI_InitStructure;

NVIC_InitStructure.NVIC_IRQChannel = RTC_Alarm_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

EXTI_ClearITPendingBit(EXTI_Line17);

EXTI_InitStructure.EXTI_Line=EXTI_Line17;

EXTI_InitStructure.EXTI_LineCmd =ENABLE;

EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising;

EXTI_Init(&EXTI_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = RTC_WKUP_IRQn ;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

EXTI_ClearITPendingBit(EXTI_Line20);

EXTI_InitStructure.EXTI_Line=EXTI_Line20;

EXTI_InitStructure.EXTI_LineCmd =ENABLE;

EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising;

EXTI_Init(&EXTI_InitStructure);

}