uint32_t TM_RTC_Init(TM_RTC_ClockSource_t source) {
uint32_t status;
TM_RTC_t datatime;
/* Set instance */
hRTC.Instance = RTC;
hRTC.Init.AsynchPrediv = RTC_ASYNC_PREDIV;
hRTC.Init.SynchPrediv = RTC_SYNC_PREDIV;
hRTC.Init.HourFormat = RTC_HOURFORMAT_24;
hRTC.Init.OutPut = RTC_OUTPUT_DISABLE;
hRTC.Init.OutPutType = RTC_OUTPUT_TYPE_PUSHPULL;
hRTC.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
/* Enable PWR peripheral clock */
__HAL_RCC_PWR_CLK_ENABLE();
/* Allow access to BKP Domain */
HAL_PWR_EnableBkUpAccess();
/* Get RTC status */
status = HAL_RTCEx_BKUPRead(&hRTC, RTC_STATUS_REG);
/* Check if RTC already initialized */
if (status == RTC_STATUS_TIME_OK) {
/* Start internal clock if we choose internal clock */
if (source == TM_RTC_ClockSource_Internal) {
TM_RTC_Config(TM_RTC_ClockSource_Internal);
}
/* Wait for RTC APB registers synchronisation (needed after start-up from Reset) */
HAL_RTC_WaitForSynchro(&hRTC);
/* Get date and time */
TM_RTC_GetDateTime(&datatime, TM_RTC_Format_BIN);
/* Clear reset flags */
__HAL_RCC_CLEAR_RESET_FLAGS();
/* Return OK */
return 1;
} else {
/* Start RTC clock */
TM_RTC_Config(source);
/* Set date */
RTC_DateStruct.Year = 0;
RTC_DateStruct.Month = 1;
RTC_DateStruct.Date = 1;
RTC_DateStruct.WeekDay = RTC_WEEKDAY_TUESDAY;
/* Set date */
HAL_RTC_SetDate(&hRTC, &RTC_DateStruct, RTC_FORMAT_BIN);
/* Set time */
RTC_TimeStruct.Hours = 0x00;
RTC_TimeStruct.Minutes = 0x00;
RTC_TimeStruct.Seconds = 0x00;
RTC_TimeStruct.TimeFormat = RTC_HOURFORMAT_24;
RTC_TimeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
RTC_TimeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
/* Set time */
HAL_RTC_SetTime(&hRTC, &RTC_TimeStruct, RTC_FORMAT_BCD);
/* Init RTC */
HAL_RTC_Init(&hRTC);
/* Save data to backup regiser */
HAL_RTCEx_BKUPWrite(&hRTC, RTC_STATUS_REG, RTC_STATUS_TIME_OK);
/* RTC was initialized now */
return 0;
}
}
uint32_t TM_RTC_Init(TM_RTC_ClockSource_t source) {
uint32_t status;
uint8_t stat = 1;
TM_RTC_Time_t datatime;
/* Enable RTC peripheral clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
/* Allow access to BKP Domain */
PWR_BackupAccessCmd(ENABLE);
/* Get RTC status */
status = RTC_ReadBackupRegister(RTC_STATUS_REG);
if (status == RTC_STATUS_TIME_OK) {
TM_RTC_Status = RTC_STATUS_TIME_OK;
/* Start internal clock if we choose internal clock */
if (source == TM_RTC_ClockSource_Internal) {
TM_RTC_Config(TM_RTC_ClockSource_Internal);
}
/* Wait for RTC APB registers synchronisation (needed after start-up from Reset) */
RTC_WaitForSynchro();
/* Clear interrupt flags */
RTC_ClearITPendingBit(RTC_IT_WUT);
EXTI_ClearITPendingBit(EXTI_Line22);
/* Get date and time */
TM_RTC_GetDateTime(&datatime, TM_RTC_Format_BIN);
} else if (status == RTC_STATUS_INIT_OK) {
TM_RTC_Status = RTC_STATUS_INIT_OK;
/* Start internal clock if we choose internal clock */
if (source == TM_RTC_ClockSource_Internal) {
TM_RTC_Config(TM_RTC_ClockSource_Internal);
}
/* Wait for RTC APB registers synchronisation (needed after start-up from Reset) */
RTC_WaitForSynchro();
/* Clear interrupt flags */
RTC_ClearITPendingBit(RTC_IT_WUT);
EXTI_ClearITPendingBit(EXTI_Line22);
/* Get date and time */
TM_RTC_GetDateTime(&datatime, TM_RTC_Format_BIN);
} else {
TM_RTC_Status = RTC_STATUS_ZERO;
/* Return status = 0 -> RTC Never initialized before */
stat = RTC_STATUS_ZERO;
/* Config RTC */
TM_RTC_Config(source);
/* Set date and time */
datatime.date = 1;
datatime.day = 1;
datatime.month = 1;
datatime.year = 0;
datatime.hours = 0;
datatime.minutes = 0;
datatime.seconds = 0;
/* Set date and time */
TM_RTC_SetDateTime(&datatime, TM_RTC_Format_BIN);
/* Initialized OK */
TM_RTC_Status = RTC_STATUS_INIT_OK;
}
/* If first time initialized */
if (stat == RTC_STATUS_ZERO) {
return 0;
}
return TM_RTC_Status;
}