Posted on August 04, 2017 at 16:43Hi
Im still new to the STM32, and now working on the RTC. The problem I am having is when I read the time from the RTC, it never changes. I Initialise the RTC, and every second I read from the rtc and display its values. I expected to see the time changing every second , but always get the same values back. Anyone please let me know what I am doing wrong?
Many Thanks
Scott
MX_RTC_Init(); //below
RTC_TimeTypeDef sTime;
__HAL_RCC_RTC_ENABLE();
while (1) //main loop
{
if(Second)
{
Second=0;
HAL_RTC_GetTime( &hrtc, &sTime, RTC_FORMAT_BIN );
//display value of the rtc time
}
}
/////////////////////////////////////////////
static void MX_RTC_Init(void)
{
RTC_TimeTypeDef sTime;
RTC_DateTypeDef sDate;
RTC_DateTypeDef dt;
RTC_TimeTypeDef tt;
hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
hrtc.Init.AsynchPrediv = 127;
hrtc.Init.SynchPrediv = 255;
hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
HAL_RTC_Init(&hrtc);
HAL_RTC_SetTime(&hrtc, &tt, RTC_FORMAT_BIN);// or bcd ofcourse
HAL_RTC_SetDate(&hrtc,&dt, RTC_FORMAT_BIN);// or bcd ofcourse
/**Initialize RTC Only
*/
hrtc.Instance = RTC;
hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
hrtc.Init.AsynchPrediv = 127;
hrtc.Init.SynchPrediv = 255;
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) != 0x32F2)
{
sTime.Hours = 0;
sTime.Minutes = 0;
sTime.Seconds = 0;
sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
sTime.StoreOperation = RTC_STOREOPERATION_SET;
if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN) != HAL_OK)
{
// _Error_Handler(__FILE__, __LINE__);
}
sDate.WeekDay = RTC_WEEKDAY_TUESDAY;
sDate.Month = RTC_MONTH_JULY;
sDate.Date = 9;
sDate.Year = 17;
if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BIN) != HAL_OK)
{
// _Error_Handler(__FILE__, __LINE__);
}
HAL_RTCEx_BKUPWrite(&hrtc,RTC_BKP_DR0,0x32F2);
}
