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Code: Select all

#include <Wire.h>
#include <RtcDS1307.h>
RtcDS1307<TwoWire> Rtc(Wire);
RtcDateTime now; // i've tried using this as global, or as a local variable, to the same result.

void setup() {
	Serial.begin(115200);
	while (!Serial) {
		delay(100);
	}
	Wire.begin(21, 22);
	Rtc.Begin();
        //.. clutter
        RtcDateTime now;
        now = Rtc.GetDateTime(); // the rtc module reports the right time/date in here 06/09/22 14:12:00. Many times if given a loop.
        xTaskCreate(loopOne, "loopOne", 2048, NULL, 1, NULL);
	xTaskCreate(loopTwo, "loopTwo", 2048, NULL, 1, NULL);
}

void loopOne(void *arg) {
	RtcDateTime now; // local
        while ( 1 ) {
                now = Rtc.GetDateTime(); //now would be 165/165/2165 37:165
                //.. clutter. long delays etc.
                // now = Rtc.GetDateTime(); //from global. same wrong value.
                delay(5);
        }
}
void loopTwo(void *arg) {
        // OR here...
        while ( 1 ) {
                RtcDateTime now = Rtc.GetDateTime(); // or like this. same wrong value.
                //.. clutter. long delays etc.
                delay(5);
        }
    }
}

void loop {
}

Code: Select all

#include <Wire.h>
#include <RtcDS1307.h>

RtcDS1307<TwoWire> Rtc(Wire);

#define countof(a) (sizeof(a) / sizeof(a[0]))
void printDateTime(const RtcDateTime& dt) {
  char datestring[20];
  snprintf_P(datestring, countof(datestring), PSTR("%02u/%02u/%04u %02u:%02u:%02u"), dt.Month(),
      dt.Day(),dt.Year(),dt.Hour(),dt.Minute(),dt.Second() );
  Serial.println(datestring);
}

void setup() {
  Serial.begin(115200);
  while (!Serial) {
    delay(100);
  }
  Wire.begin(21, 22);
  xTaskCreate(loopOne, "loopOne", 2048, NULL, 1, NULL);
  xTaskCreate(loopTwo, "loopTwo", 2048, NULL, 1, NULL);
}

void loopOne(void *arg) {
  Rtc.Begin();
  if (!Rtc.IsDateTimeValid()) {
    if (Rtc.LastError() != 0) {
      Serial.print("RTC communications error = ");
      Serial.println(Rtc.LastError());
    } else {
      Serial.println("RTC lost confidence in the DateTime!");
    }
  }
  if (!Rtc.GetIsRunning()) {
    Serial.println("RTC was not actively running, starting now");
    Rtc.SetIsRunning(true);
  }
  Rtc.SetSquareWavePin(DS1307SquareWaveOut_Low);
  RtcDateTime now = Rtc.GetDateTime();
  printDateTime(now);
  
  while ( 1 ) {
    now = Rtc.GetDateTime();
    printDateTime(now);
    delay(5000);
  }
}

void loopTwo(void *arg) {
  while ( 1 ) {
    delay(1000);
  }
}

void loop() {
}

Code: Select all

Rtc.SetSquareWavePin(DS1307SquareWaveOut_Low);