RTC_WakeUp中断唤醒STM32F4停止模式

RTC_WakeUp唤醒STM32F4停止模式(借鉴的是原子哥写的代码):
首先我们先初始化RTC配置:

//RTC初始化u8 MyRTC_Init(void){    RTC_InitTypeDef RTC_InitStructrue;    u16 retry=0x1FFF;    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR,ENABLE);//使能PWR时钟    PWR_BackupAccessCmd(ENABLE);//使能后备寄存器    if(RTC_ReadBackupRegister(RTC_BKP_DR0)!=0x5050)    {        RCC_LSEConfig(RCC_LSE_ON);//开启低速外部时钟        if(RCC_GetFlagStatus(RCC_FLAG_LSERDY)==RESET)//读取外部低速时钟是否准备就绪        {            retry++;            delay_ms(10);        }        if(retry==0)            return 1;//LSE开启失败        RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);//选择LSE作为RTC时钟        RCC_RTCCLKCmd(ENABLE);//使能RTC时钟        RTC_InitStructrue.RTC_AsynchPrediv=0x7F;//RTC异步分频系数127        RTC_InitStructrue.RTC_SynchPrediv=0xFF;//RTC同步分频系数255        RTC_Init(&RTC_InitStructrue);//RTC初始化函数        RTC_WriteBackupRegister(RTC_BKP_DR0,0x5050);    }    return 0;}

然后配置RTC_WakeUp:

void RTC_Set_WakeUp(u16 waketime){    EXTI_InitTypeDef EXTI_InitStruct;    NVIC_InitTypeDef NVIC_InitStruct;    RTC_WakeUpCmd(DISABLE);//关闭Wake Up    RTC_WakeUpClockConfig(RTC_WakeUpClock_CK_SPRE_16bits);//时钟选择1Hz    RTC_SetWakeUpCounter(waketime);//设置WakeUp自动重装载值    RTC_ClearITPendingBit(RTC_IT_WUT);//清除WakeUp中断标志    EXTI_ClearITPendingBit(EXTI_Line22);//清除Line22中断标志    RTC_ITConfig(RTC_IT_WUT,ENABLE);//开启WakeUp中断标志    RTC_WakeUpCmd(ENABLE);//开启WakeUp    EXTI_InitStruct.EXTI_Line=EXTI_Line22;//LINE22    EXTI_InitStruct.EXTI_LineCmd=ENABLE;    EXTI_InitStruct.EXTI_Mode=EXTI_Mode_Interrupt;    EXTI_InitStruct.EXTI_Trigger=EXTI_Trigger_Rising;//上升沿触发    EXTI_Init(&EXTI_InitStruct);    NVIC_InitStruct.NVIC_IRQChannel=RTC_WKUP_IRQn;//选择WakeUp中断    NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=0x01;    NVIC_InitStruct.NVIC_IRQChannelSubPriority=0x02;    NVIC_Init(&NVIC_InitStruct);}

编写RTC_WakeUp中断函数(记得初始化系统时钟):

void RTC_WKUP_IRQHandler(){    while(RTC_GetFlagStatus(RTC_FLAG_WUTF)!=RESET)    {        RTC_ClearFlag(RTC_FLAG_WUTF);        SystemInit();        LED1=!LED1;    }    EXTI_ClearITPendingBit(EXTI_Line22);}

然后就是main函数了:

int main(void){     u8 t=0;    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置系统中断优先级分组2    delay_init(168);      //初始化延时函数    uart_init(9600);        //初始化串口波特率为9600    LED_Init();                   //初始化LED             KEY_Init();    MyRTC_Init();    while(1)   {        LED0=!LED0;        RTC_Set_WakeUp(5);//时钟频率选的1Hz,5S产生一次RTC_WakeUp中断        printf("t=%d\n\r",t);        PWR_EnterSTOPMode(PWR_LowPowerRegulator_ON,PWR_STOPEntry_WFI);        t++;        if(t>30)         t=0;    }

把USART1接串口调试助手上,变量t从0开始每5秒加1,同时LED每5秒反转一次状态.
**注意哈:
停止模式是烧录不进程序的,要烧录程序的话,要先按住RESET键,点download后,松手就能下进去了.**