//RtcDS1307_Test01a
//https://wolles-elektronikkiste.de/ds1302-und-ds1307-rtc-real-time-clock

String version = "RtcDS1307_Test01a v0.00";

#include <Wire.h>  
//#include <DS1307RTC.h>
#include "RtcDS1307.h"
//#include <RtcDS1307.h>

RtcDS1307<TwoWire> rtc(Wire);

void setup () {
    Serial.begin(9600);
    Serial.println(version);

    rtc.Begin();
    if(!rtc.GetIsRunning()) {
        Serial.println("RTC was not actively running, starting now");
        rtc.SetIsRunning(true);
    }
    RtcDateTime compiled = RtcDateTime(__DATE__, __TIME__);
    Serial.println("Compile Time:");
    printDateTime(compiled);
    Serial.println();
    rtc.SetDateTime(compiled);
 
    Serial.println("Enter the new time as hh:mm:ss");
}

void loop () {
    RtcDateTime now = rtc.GetDateTime();
    static int currentSecond = 61; // currentSecond to be different from first nextSecond
    int nextSecond = now.Second();
  
    if(nextSecond != currentSecond){
        printDateTime(now);
        Serial.println();
        currentSecond = nextSecond;
    }

    if(Serial.available()){
        uint8_t newHour = Serial.parseInt();
        uint8_t newMinute = Serial.parseInt();
        uint8_t newSecond = Serial.parseInt();
        rtc.SetDateTime(RtcDateTime(now.Year(),now.Month(),now.Day(),newHour, newMinute, newSecond));
        while(Serial.available()){
            Serial.read();
        }
    }
}

#define countof(a) (sizeof(a) / sizeof(a[0]))

void printDateTime(const RtcDateTime& dt){
    char datestring[25];
    char daysOfTheWeek[7][4] = {"Sun","Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};

    snprintf_P(datestring, 
        countof(datestring),
        PSTR("%3s, %02u.%02u.%04u %02u:%02u:%02u"),
        daysOfTheWeek[dt.DayOfWeek()],
        dt.Day(),
        dt.Month(),
        dt.Year(),
        dt.Hour(),
        dt.Minute(),
        dt.Second() );
    Serial.print(datestring);
}