RTC代表的是實(shí)時(shí)時(shí)鐘的意思，因?yàn)樗峁┑臅r(shí)鐘基準(zhǔn)比較準(zhǔn)確所以用處還是很多的。

RTC全局中斷：

void RTC_IRQHandler()

{

if(RTC_GetITStatus(RTC_IT_ALR)!=RESET) //是否鬧鐘中斷發(fā)生

{

printf("THE ALARM READY =%d \r\n",RTC_GetCounter());//輸出此時(shí)的秒數(shù)

RTC_ClearITPendingBit(RTC_IT_ALR);

PWR_BackupAccessCmd(ENABLE);

RTC_EnterConfigMode();

RTC_WaitForLastTask();

RTC_SetAlarm(40+RTC_GetCounter()); //配置下次鬧鐘為40s后

RTC_WaitForLastTask();

RTC_ExitConfigMode();

PWR_BackupAccessCmd(DISABLE);

}

if(RTC_GetITStatus(RTC_IT_SEC)!=RESET) //是否秒中斷發(fā)生

{

printf("Time is =%d \r\n",RTC_GetCounter()); //輸出此時(shí)的秒數(shù)

}

RTC_ClearITPendingBit(RTC_IT_SEC|RTC_IT_OW); //清除秒中斷標(biāo)志位和溢出位

RTC_WaitForLastTask();

}

待機(jī)喚醒：

待機(jī)模式是功耗最低的一種模式。外部復(fù)位(NRST 引腳)、 IWDG 復(fù)位、 WKUP 引腳上的上升沿或 RTC 鬧鐘事件發(fā)生時(shí)，STM32從待機(jī)模式退出。其中外部復(fù)位和WKUP的方法比較簡單。主要講一下RTC鬧鐘喚醒。這兩個(gè)程序一個(gè)是讓STM32的一個(gè)管腳接按鍵，按鍵按下的時(shí)候STM32進(jìn)入待機(jī)狀態(tài)，當(dāng)40秒的鬧鐘到來時(shí)喚醒STM32.另一個(gè)是當(dāng)按鍵按下時(shí)候進(jìn)入待機(jī)狀態(tài)，鬧鐘設(shè)置為5S秒后，鬧鐘來臨時(shí)喚醒STM32。

void RTC_Init()

{

NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_BKP|RCC_APB1Periph_PWR,ENABLE);

PWR_WakeUpPinCmd(ENABLE);

PWR_BackupAccessCmd(ENABLE);

BKP_DeInit();

RCC_LSEConfig(RCC_LSE_ON);

while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)

{

}

RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);

RCC_RTCCLKCmd(ENABLE);

RTC_WaitForLastTask();

RTC_WaitForSynchro();

RTC_ITConfig(RTC_IT_SEC, ENABLE);

RTC_WaitForLastTask();

RTC_EnterConfigMode();

RTC_SetCounter(0); //設(shè)置計(jì)數(shù)初始值

RTC_WaitForLastTask();

RTC_SetPrescaler(32767);

RTC_WaitForLastTask();

RTC_SetAlarm(40); //鬧鐘定時(shí)40S

RTC_WaitForLastTask();

RTC_ExitConfigMode();

NVIC_InitStructure.NVIC_IRQChannel = RTC_IRQn; //RTC全局中斷 它的優(yōu)先級(jí)要小于按鍵

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

void EXTIX_Init(void)

{

EXTI_InitTypeDef EXTI_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;

GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_EXTILineConfig(GPIO_PortSourceGPIOC,GPIO_PinSource5);//配置按鍵PC5為外部中斷

EXTI_InitStructure.EXTI_Line=EXTI_Line5;

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; //外部中斷的優(yōu)先級(jí)高于RTC

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

void EXTI9_5_IRQHandler() //按鍵對(duì)應(yīng)的外部中斷

{

EXTI_ClearITPendingBit(EXTI_Line5);

PWR_EnterSTANDBYMode(); //進(jìn)入待機(jī)模式

}

void RTC_IRQHandler() //RTC的中斷

{

if(RTC_GetITStatus(RTC_IT_SEC)!=RESET)

{

printf("TIME IS =%d \r\n",RTC_GetCounter());

}

RTC_ClearITPendingBit(RTC_IT_SEC|RTC_IT_OW);

RTC_WaitForLastTask();

}


文章整合自：eeworld

編輯：ymf