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.**