RTCLib.h

/*
 *******************************************************************
  Eng. Abdulkadir MÜHENDİS, M.Sc. Embedded Systems Arcitect
  Nextion Basic 3.5 inch with external RTC Module
 *******************************************************************
*/
#ifndef RTCLIB
	#define RTCLIB
	#include "Arduino.h"
	#include "Wire.h"
	/*
	RTC I2C Address:
	DS3231 ROM 0x57
	DS3231 RTC 0x68
	*/
	#define RTCLIB_ADDRESS 0x68
	#define RTCLIB_EE_ADDRESS 0x57

	//Comment to disable RTC-setting function
	#define RTCLIB_SET

	//Comment to disable EEPROM functionality
	#define RTCLIB_EEPROM

	// Convert normal decimal numbers to binary coded decimal
	#define RTCLIB_decToBcd(val) ((uint8_t) ((val / 10 * 16) + (val % 10)))
	//#define RTCLIB_decToBcd(val) ((uint8_t) (val + 6 * (val / 10)))

	// Convert binary coded decimal to normal decimal numbers
	//#define RTCLIB_bcdToDec(val) ((uint8_t) (val - 6 * (val >> 4)))
	#define RTCLIB_bcdToDec(val) ((uint8_t) ((val / 16 * 10) + (val % 16)))


	#ifdef _VARIANT_ARDUINO_STM32_
		#define RTCLIB_INIT_WIRE() if (_do_init) { _do_init = false; Wire.begin(); }
	#endif


	class RTCLib {
		public:
			RTCLib();
			uint8_t second();
			uint8_t minute();
			uint8_t hour();
			uint8_t day();
			uint8_t month();
			uint8_t year();
			uint8_t seconds();
			uint8_t dayOfWeek();
			void refresh();

			#ifdef RTCLIB_SET
				void set(uint8_t second, uint8_t minute, uint8_t hour, uint8_t dayOfWeek, uint8_t dayOfMonth, uint8_t month, uint8_t year);
			#endif

			#ifdef RTCLIB_EEPROM
				unsigned char eeprom_read(const unsigned int address);
				void eeprom_write(const unsigned int address, const unsigned char data);
			#endif;

		private:
			uint8_t _second ;
			uint8_t _minute;
			uint8_t _hour;
			uint8_t _day;
			uint8_t _month;
			uint8_t _year;
			uint8_t _dayOfWeek;
			#ifdef _VARIANT_ARDUINO_STM32_
				bool _do_init = true;
			#endif
	};
#endif