Add RTC implementation based on millis for ESP8266

Author: pennam

src/utility/time/RTCMillis.cpp

@@ -0,0 +1,63 @@
+/*
+   This file is part of ArduinoIoTCloud.
+
+   Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
+
+   This software is released under the GNU General Public License version 3,
+   which covers the main part of arduino-cli.
+   The terms of this license can be found at:
+   https://www.gnu.org/licenses/gpl-3.0.en.html
+
+   You can be released from the requirements of the above licenses by purchasing
+   a commercial license. Buying such a license is mandatory if you want to modify or
+   otherwise use the software for commercial activities involving the Arduino
+   software without disclosing the source code of your own applications. To purchase
+   a commercial license, send an email to [email protected].
+*/
+
+#ifdef ARDUINO_ARCH_ESP8266
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+#include <Arduino.h>
+#include "RTCMillis.h"
+
+/**************************************************************************************
+ * CTOR/DTOR
+ **************************************************************************************/
+
+RTCMillis::RTCMillis()
+: _last_rtc_update_tick(0)
+, _last_rtc_update_value(0)
+{
+
+}
+
+/**************************************************************************************
+ * PUBLIC MEMBER FUNCTIONS
+ **************************************************************************************/
+
+void RTCMillis::begin()
+{
+
+}
+
+void RTCMillis::set(unsigned long time)
+{
+  _last_rtc_update_tick = millis();
+  _last_rtc_update_value = time;
+}
+
+unsigned long RTCMillis::get()
+{
+  unsigned long current_tick = millis();
+  unsigned long const elapsed_s = (current_tick - _last_rtc_update_tick) / 1000;
+  if(elapsed_s) {
+    set(_last_rtc_update_value + elapsed_s);
+  }
+  return _last_rtc_update_value;
+}
+
+#endif /* ARDUINO_ARCH_ESP8266 */

src/utility/time/RTCMillis.h

@@ -0,0 +1,50 @@
+/*
+   This file is part of ArduinoIoTCloud.
+
+   Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
+
+   This software is released under the GNU General Public License version 3,
+   which covers the main part of arduino-cli.
+   The terms of this license can be found at:
+   https://www.gnu.org/licenses/gpl-3.0.en.html
+
+   You can be released from the requirements of the above licenses by purchasing
+   a commercial license. Buying such a license is mandatory if you want to modify or
+   otherwise use the software for commercial activities involving the Arduino
+   software without disclosing the source code of your own applications. To purchase
+   a commercial license, send an email to [email protected].
+*/
+
+#ifndef ARDUINO_IOT_CLOUD_RTC_MILLIS_H_
+#define ARDUINO_IOT_CLOUD_RTC_MILLIS_H_
+
+#ifdef ARDUINO_ARCH_ESP8266
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+/**************************************************************************************
+ * CLASS DECLARATION
+ **************************************************************************************/
+
+class RTCMillis
+{
+
+public:
+
+  RTCMillis();
+
+  void          begin();
+  void          set(unsigned long time);
+  unsigned long get();
+
+private:
+  unsigned long _last_rtc_update_tick;
+  unsigned long _last_rtc_update_value;
+
+};
+
+#endif /* ARDUINO_ARCH_ESP8266 */
+
+#endif /* ARDUINO_IOT_CLOUD_RTC_MILLIS_H_ */