关于STM32F4的RTC疑问

发布于 2019-11-16 11:00:00 浏览：2003 订阅该版

* 本帖最后由 kuailedeluojie 于 2019-11-16 11:32 编辑 *

> /*******************************************************************************
* Function Name  : RTC_Configuration
* Description    : Configures the RTC.
* Input          : None
* Output         : None
* Return         : 0 reday,-1 error.
*******************************************************************************/
int RTC_Configuration(void)
{
        RTC_InitTypeDef RTC_InitStructure;
        /* Enable the PWR clock */
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

/* Allow access to RTC */
        PWR_BackupAccessCmd(ENABLE);

#if defined (RTC_CLOCK_SOURCE_LSI)  /* LSI used as RTC source clock*/
        /* The RTC Clock may varies due to LSI frequency dispersion */   
        /* Enable the LSI OSC */ 
        RCC_LSICmd(ENABLE);

/* Wait till LSI is ready */  
        while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
        {
        }

/* Select the RTC Clock Source */
        RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);

/* ck_spre(1Hz) = RTCCLK(LSI) /(uwAsynchPrediv + 1)*(uwSynchPrediv + 1)*/
        //uwSynchPrediv = 0xFF;
        //uwAsynchPrediv = 0x7F;

#elif defined (RTC_CLOCK_SOURCE_LSE) /* LSE used as RTC source clock */
        /* Enable the LSE OSC */
        RCC_LSEConfig(RCC_LSE_ON);

/* Wait till LSE is ready */  
        while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
        {
        }
        /* Select the RTC Clock Source */
        RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);

#else
#error Please select the RTC Clock source inside the main.c file
#endif /* RTC_CLOCK_SOURCE_LSI */

/* Enable the RTC Clock */
        RCC_RTCCLKCmd(ENABLE);

/* Wait for RTC APB registers synchronisation */
        RTC_WaitForSynchro();

z这是RTC的配置代码，用的是RTC_CLOCK_SOURCE_LSE，之前能正常运行的，设置了一次之后，重启一下，就获取不了正常时间了。
> void RTC_TimeAndDate_Set(void)
{
        RTC_TimeTypeDef RTC_TimeStructure;
        RTC_DateTypeDef RTC_DateStructure;
        
        // 初始化时间
        RTC_TimeStructure.RTC_H12 = RTC_H12_AMorPM;
        RTC_TimeStructure.RTC_Hours = HOURS;        
        RTC_TimeStructure.RTC_Minutes = MINUTES;      
        RTC_TimeStructure.RTC_Seconds = SECONDS;      
        RTC_SetTime(RTC_Format_BINorBCD, &RTC_TimeStructure);
        RTC_WriteBackupRegister(RTC_BKP_DRX, RTC_BKP_DATA);
        
  // 初始化日期        
        RTC_DateStructure.RTC_WeekDay = WEEKDAY;       
        RTC_DateStructure.RTC_Date = DATE;         
        RTC_DateStructure.RTC_Month = MONTH;         
        RTC_DateStructure.RTC_Year = YEAR;        
        RTC_SetDate(RTC_Format_BINorBCD, &RTC_DateStructure);
        RTC_WriteBackupRegister(RTC_BKP_DRX, RTC_BKP_DATA);
}

以上是时间设置函数
> void show_time(void)
{
        RTC_TimeTypeDef        t;
        RTC_DateTypeDef        d;
        /* Get the current Date */
        RTC_GetDate(RTC_Format_BIN,&d);
        /* Get the current Time */
        RTC_GetTime(RTC_Format_BIN, &t);
        /* Display time Format : hh:mm:ss */
        rt_kprintf("Now Time = 20%02d %02d %02d[%02d]-%0.2d:%0.2d:%0.2d  <br>", \
                d.RTC_Year,d.RTC_Month,d.RTC_Date,d.RTC_WeekDay,t.RTC_Hours, t.RTC_Minutes, t.RTC_Seconds);
}

这是获取时间函数
以下是RTC配置相关函数
> 
void rt_hw_rtc_init(void)
{
    rtc.type	= RT_Device_Class_RTC;

if (RTC_ReadBackupRegister(RTC_BKP_DR0) != 0x32F2)
    {
        rt_kprintf("rtc is not configured<br>");
        rt_kprintf("please configure with set_date and set_time<br>");
        if ( RTC_Configuration() != 0)
        {
            rt_kprintf("rtc configure fail... <br>");
            return ;
        }
    }
    else
    {
        /* Wait for RTC registers synchronization */
        RTC_WaitForSynchro();
    }

/* register rtc device */
    rtc.init 	= RT_NULL;
    rtc.open 	= rt_rtc_open;
    rtc.close	= RT_NULL;
    rtc.read 	= rt_rtc_read;
    rtc.write	= RT_NULL;
    rtc.control = rt_rtc_control;

/* no private */
    rtc.user_data = RT_NULL;

rt_device_register(&rtc, "rtc", RT_DEVICE_FLAG_RDWR);
		 show_time();
    return;
}
每次都打印一样的结果，请大神指点一下
Now Time = 2000 01 01[01]-00:00:00