Afisaj TFT, refresh la 1 minut

// CONNECTIONS:
// DS1302 CLK/SCLK --> 5
// DS1302 DAT/IO --> 4
// DS1302 RST/CE --> 2
// DS1302 VCC --> 3.3v - 5v
// DS1302 GND --> GND

#include <ThreeWire.h>
#include <RtcDS1302.h>
#include <TFT.h>
#include <SPI.h>

#define cs   10
#define dc   9
#define rst  8
unsigned long previousMillis = 0;
int Min=0;
TFT TFTscreen = TFT(cs, dc, rst);

ThreeWire myWire(6,7,5); // IO, SCLK, CE
RtcDS1302<ThreeWire> Rtc(myWire);

void setup ()
{
    Serial.begin(57600);

     //initialize the library
     TFTscreen.begin();

     // clear the screen with a black background
     TFTscreen.background(0, 0, 0);

     //TFTscreen.setRotation(0);

    Serial.print("compiled: ");
    Serial.print(__DATE__);
    Serial.println(__TIME__);

    Rtc.Begin();

    RtcDateTime compiled = RtcDateTime(__DATE__, __TIME__);
    printData(compiled);
    Serial.println();

    if (!Rtc.IsDateTimeValid())
    {
        // Common Causes:
        //    1) first time you ran and the device wasn't running yet
        //    2) the battery on the device is low or even missing

        Serial.println("RTC lost confidence in the DateTime!");
        Rtc.SetDateTime(compiled);
    }

    if (Rtc.GetIsWriteProtected())
    {
        Serial.println("RTC was write protected, enabling writing now");
        Rtc.SetIsWriteProtected(false);
    }

    if (!Rtc.GetIsRunning())
    {
        Serial.println("RTC was not actively running, starting now");
        Rtc.SetIsRunning(true);
    }

    RtcDateTime now = Rtc.GetDateTime();
    if (now < compiled)
    {
        Serial.println("RTC is older than compile time!  (Updating DateTime)");
        Rtc.SetDateTime(compiled);
    }
    else if (now > compiled)
    {
        Serial.println("RTC is newer than compile time. (this is expected)");
    }
    else if (now == compiled)
    {
        Serial.println("RTC is the same as compile time! (not expected but all is fine)");
    }
}

void loop ()
{

    TFTscreen.stroke(155, 155, 155);
    RtcDateTime now = Rtc.GetDateTime();

    printData(now);
    printOra(now);
    printMin(now);
    Serial.println();

    if (!now.IsValid())
    {
        // Common Causes:
        //    1) the battery on the device is low or even missing and the power line was disconnected
        Serial.println("RTC lost confidence in the DateTime!");
    }

    //delay(6000);

    // unsigned long currentMillis = millis();

    // if (currentMillis - previousMillis >= 6000) {
    // save the last time
    //previousMillis = currentMillis;


    //TFTscreen.background(0,0,0);

    //}


}

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

void printData(const RtcDateTime& dt)
{
    char datestring[20];
    //set the text size
     TFTscreen.setTextSize(2);

    snprintf_P(datestring,
            countof(datestring),
            PSTR("%02u/%02u/%04u"),
            dt.Day(),
            dt.Month(),
            dt.Year() );
    //Serial.print(datestring);
    TFTscreen.text(datestring, 22, 10);

}

void printOra(const RtcDateTime& dt)
{
    char datestring[20];
    //set the text size
    TFTscreen.setTextSize(5);
    snprintf_P(datestring,
            countof(datestring),
            PSTR("%02u:%02u"),
            dt.Hour(),
            dt.Minute());
    //Serial.print(datestring);

    TFTscreen.text(datestring, 6, 57);


}
void printMin(const RtcDateTime& dt)
{
    char datestring[3];
    int Idatestring=atoi(datestring);
    //set the text size
    TFTscreen.setTextSize(5);
    snprintf_P(datestring,
            countof(datestring),
            PSTR("%02u"),
            dt.Minute());
    //Serial.print(datestring);
    Serial.print(Idatestring-Min); //daca se sterge nu mai compara (Idatestring-Min)>0....ramane = cu 0 in permanenta

    //TFTscreen.text(datestring, 6, 57);

    if ((Idatestring-Min)>0)
    {
      Min=Idatestring;
      TFTscreen.background(0,0,0);
    }

}