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RTC_com.h

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+/*
+  RTC_com.h
+
+  MIT License
+  Copyright (c) 2023 hdrlux
+  
+  all RTC functions, tested hardware:
+  - DS3231SN via I2C, has only 2-digit years, the Epoch is 2000-01-01. Valid until year 2099
+  - set Pin: PseudoPPS Interrupt in file RTC_com.cpp [default: 3 = NANO INT1]
+  - set Pin: PseudoPPS LED in file RTC_com.cpp [default: A3]
+*/
+
+#ifndef RTC_com_H
+#define RTC_com_H
+
+extern bool SyncErr;        // RTC not synced in last n hours
+#include "GPS_RTC_Clock.h"  // for passing new second
+
+// handle interrupt
+void rtc_interrupt();
+
+// setup the pin as output
+void RTC_LED_setup();
+
+// setup hardware & interrupt from PseudoPPS
+void RTC_setup();
+
+// main RTC loop, RTC_com
+void RTC_loop();
+
+// sync RTC from GPS
+void SetRTC(time_t t);
+
+#endif  // RTC_com_H