STA모드 추가

rtc_task.h

@@ -0,0 +1,46 @@
+#ifndef RTC_TASK_H
+#define RTC_TASK_H
+
+#include <Arduino.h>
+#include <SoftWire.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <freertos/semphr.h>
+#include "config.h"
+
+// RTC status
+struct RTCStatus {
+  bool available;       // DS3231 detected on I2C
+  bool timeSynced;      // RTC has been set with valid time
+  uint32_t syncCount;   // Number of RTC → System syncs
+  float temperature;    // DS3231 internal temperature
+};
+
+extern RTCStatus rtcStatus;
+extern SemaphoreHandle_t rtcMutex;
+
+// Initialize DS3231 and read time
+bool rtcInit();
+
+// Read time from DS3231 → returns epoch (0 = fail)
+time_t rtcReadTime();
+
+// Write time to DS3231 from epoch
+bool rtcWriteTime(time_t epoch);
+
+// Sync: RTC → ESP32 system clock
+bool rtcSyncToSystem();
+
+// Sync: ESP32 system clock → RTC
+bool rtcSyncFromSystem();
+
+// Read DS3231 temperature (°C, ±0.25 resolution)
+float rtcReadTemperature();
+
+// RTC periodic sync task
+void rtcSyncTask(void *param);
+
+// Start RTC task
+void rtcTaskInit();
+
+#endif // RTC_TASK_H