RTC时间更新

首先，需要对RTC进行初始化，初始化的详解介绍见链接：RTC

static void MX_RTC_Init(void)
{
RTC_TimeTypeDef sTime;
RTC_DateTypeDef sDate;
RTC_AlarmTypeDef sAlarm;

/**Initialize RTC Only
*/
hrtc.Instance = RTC;
hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
hrtc.Init.AsynchPrediv = 39;
hrtc.Init.SynchPrediv = 799;//本芯片采用内部32K时钟源，32k/(39+1)(799+1)=1HZ
hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
if (HAL_RTC_Init(&hrtc) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}

/**Initialize RTC and set the Time and Date
*/
if(HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR0) != 0x32F6)
{
sTime.Hours = 0x01;
sTime.Minutes = 0x01;
sTime.Seconds = 0x01;
sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
sTime.StoreOperation = RTC_STOREOPERATION_RESET;
if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}

sDate.WeekDay = RTC_WEEKDAY_FRIDAY;
sDate.Month = RTC_MONTH_JANUARY;
sDate.Date = 0x01;
sDate.Year = 0x18;

if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BCD) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}

HAL_RTCEx_BKUPWrite(&hrtc,RTC_BKP_DR0,0x32F6);
}
}

下面是在获取了网络时间后，对RTC进行更新的代码。

//  RTC更新
void RTC_Update(void)
{
RTC_DateTypeDef sdatestructure;
RTC_TimeTypeDef stimestructure;

/*##-1- Configure the Date #################################################*/
sdatestructure.Year =  Net_time->tm_year+1900-2000;
sdatestructure.Month =  Net_time->tm_mon+1;
sdatestructure.Date = Net_time->tm_mday;
sdatestructure.WeekDay = Net_time->tm_wday;

if (HAL_RTC_SetDate(&hrtc, &sdatestructure, RTC_FORMAT_BIN) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}

/*##-2- Configure the Time #################################################*/
stimestructure.Hours =  Net_time->tm_hour;
stimestructure.Minutes =  Net_time->tm_min;
stimestructure.Seconds = Net_time->tm_sec;
stimestructure.TimeFormat = RTC_HOURFORMAT12_AM;
stimestructure.DayLightSaving = RTC_DAYLIGHTSAVING_NONE ;
stimestructure.StoreOperation = RTC_STOREOPERATION_RESET;

if (HAL_RTC_SetTime(&hrtc, &stimestructure, RTC_FORMAT_BIN) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
HAL_RTCEx_BKUPWrite(&hrtc,RTC_BKP_DR0,0x32F6);
}

接着是获取RTC时间并打印出来代码。

void RTC_Show(void)
{
RTC_DateTypeDef sdate_get;
RTC_TimeTypeDef stime_get;

/* Get the RTC current Date */
HAL_RTC_GetDate(&hrtc, &sdate_get, RTC_FORMAT_BIN);
/* Get the RTC current Time */
HAL_RTC_GetTime(&hrtc, &stime_get, RTC_FORMAT_BIN);

printf("%d-%02d-%02d   %02d:%02d:%02d\r\n",2000 + sdate_get.Year, sdate_get.Month, sdate_get.Date,\
stime_get.Hours,stime_get.Minutes,stime_get.Seconds);

}

主程序中调用NTP函数获取时间、然后更新RTC，接着打印出更新之后的RTC时间即可。下图是从NTP获取时间后间隔5秒打印出RTC时间的效果。