Fix RTC initialization so it is not re-initialized across soft resets.

Src/main.c

@@ -143,6 +143,7 @@ osStaticTimerDef_t beaconTimer4ControlBlock;
 /* USER CODE BEGIN PV */
 /* Private variables ---------------------------------------------------------*/
 
+int lost_power = 0;
 int reset_requested = 0;
 char serial_number[25];
 char serial_number_64[17] = {0};
@@ -182,6 +183,8 @@ void configure_gpio_for_stop(void) __attribute__((noinline));
 void power_down_vdd(void);
 void configure_wakeup_gpio(void);
 void enable_debug_gpio(void);
+void init_rtc_date_time(void);
+void init_rtc_alarm(void);
 
 /* USER CODE END PFP */
 
@@ -517,8 +520,11 @@ int main(void)
   if (HAL_OPAMP_Start(&hopamp1) != HAL_OK) Error_Handler();
   if (HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED) != HAL_OK) Error_Handler();
 
-  // Initialize the BM78 Bluetooth module the first time we boot.
-  if (!bm78_initialized()) bm78_initialize();
+  // Initialize the BM78 Bluetooth module and the RTC date/time the first time we boot.
+  if (!bm78_initialized()) {
+      bm78_initialize();
+      // init_rtc_date_time();
+  }
   else bm78_wait_until_ready();
 
   init_ioport();
@@ -893,9 +899,6 @@ static void MX_RTC_Init(void)
 
   /* USER CODE END RTC_Init 0 */
 
-  RTC_TimeTypeDef sTime;
-  RTC_DateTypeDef sDate;
-  RTC_AlarmTypeDef sAlarm;
 
   /* USER CODE BEGIN RTC_Init 1 */
 
@@ -916,51 +919,7 @@ static void MX_RTC_Init(void)
     _Error_Handler(__FILE__, __LINE__);
   }
 
-    /**Initialize RTC and set the Time and Date 
-    */
-  sTime.Hours = 0x0;
-  sTime.Minutes = 0x0;
-  sTime.Seconds = 0x0;
-  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_MONDAY;
-  sDate.Month = RTC_MONTH_JANUARY;
-  sDate.Date = 0x1;
-  sDate.Year = 0x0;
-
-  if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BCD) != HAL_OK)
-  {
-    _Error_Handler(__FILE__, __LINE__);
-  }
-
-    /**Enable the Alarm A 
-    */
-  sAlarm.AlarmTime.Hours = 0x0;
-  sAlarm.AlarmTime.Minutes = 0x0;
-  sAlarm.AlarmTime.Seconds = 0x0;
-  sAlarm.AlarmTime.SubSeconds = 0x0;
-  sAlarm.AlarmTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
-  sAlarm.AlarmTime.StoreOperation = RTC_STOREOPERATION_RESET;
-  sAlarm.AlarmMask = RTC_ALARMMASK_NONE;
-  sAlarm.AlarmSubSecondMask = RTC_ALARMSUBSECONDMASK_ALL;
-  sAlarm.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE;
-  sAlarm.AlarmDateWeekDay = 0x1;
-  sAlarm.Alarm = RTC_ALARM_A;
-  if (HAL_RTC_SetAlarm(&hrtc, &sAlarm, RTC_FORMAT_BCD) != HAL_OK)
-  {
-    _Error_Handler(__FILE__, __LINE__);
-  }
-
-    /**Enable the Alarm B 
-    */
-  sAlarm.AlarmDateWeekDay = 0x1;
-  sAlarm.Alarm = RTC_ALARM_B;
-
+  init_rtc_date_time();
 }
 
 /* TIM1 init function */
@@ -1303,6 +1262,66 @@ int _write(int file, char *ptr, int len) {
 }
 #endif
 
+void init_rtc_date_time()
+{
+    if (HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR1) != 0) return;
+
+    RTC_TimeTypeDef sTime;
+    RTC_DateTypeDef sDate;
+
+    /**Initialize RTC and set the Time and Date
+    */
+  sTime.Hours = 0x0;
+  sTime.Minutes = 0x0;
+  sTime.Seconds = 0x0;
+  sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
+  sTime.StoreOperation = RTC_STOREOPERATION_RESET;
+  sTime.TimeFormat = RTC_HOURFORMAT_24;
+  if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK)
+  {
+    _Error_Handler(__FILE__, __LINE__);
+  }
+
+  sDate.WeekDay = RTC_WEEKDAY_MONDAY;
+  sDate.Month = RTC_MONTH_JANUARY;
+  sDate.Date = 0x1;
+  sDate.Year = 0x0;
+
+  if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BCD) != HAL_OK)
+  {
+    _Error_Handler(__FILE__, __LINE__);
+  }
+}
+
+void init_rtc_alarm()
+{
+    RTC_AlarmTypeDef sAlarm;
+
+    /**Enable the Alarm A
+    */
+  sAlarm.AlarmTime.Hours = 0x0;
+  sAlarm.AlarmTime.Minutes = 0x0;
+  sAlarm.AlarmTime.Seconds = 0x0;
+  sAlarm.AlarmTime.SubSeconds = 0x0;
+  sAlarm.AlarmTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
+  sAlarm.AlarmTime.StoreOperation = RTC_STOREOPERATION_RESET;
+  sAlarm.AlarmMask = RTC_ALARMMASK_NONE;
+  sAlarm.AlarmSubSecondMask = RTC_ALARMSUBSECONDMASK_ALL;
+  sAlarm.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE;
+  sAlarm.AlarmDateWeekDay = 0x1;
+  sAlarm.Alarm = RTC_ALARM_A;
+  if (HAL_RTC_SetAlarm(&hrtc, &sAlarm, RTC_FORMAT_BCD) != HAL_OK)
+  {
+    _Error_Handler(__FILE__, __LINE__);
+  }
+
+    /**Enable the Alarm B
+    */
+  sAlarm.AlarmDateWeekDay = 0x1;
+  sAlarm.Alarm = RTC_ALARM_B;
+
+}
+
 /* USER CODE END 4 */
 
 /* USER CODE BEGIN Header_StartDefaultTask */