RTC Testing

SetDateTime.ino

/*
  RV-3028-C7 Set Date Time Example

  Configures date and time to the RTC module via the serial console, and then
  prints the current date and time in ISO 8601 format every second.

  Copyright (c) 2020 Macro Yau

  https://github.com/MacroYau/RV-3028-C7-Arduino-Library
*/

#include <RV3028C7.h>

RV3028C7 rtc;

// TEST
// 1. Plug in USB & LIPO Batteru
// 2. Run Once. 
// Output:

// 16:15:56.517 -> 2024-04-19T00:00:01
// 16:15:57.516 -> 2024-04-19T00:00:02
// 16:15:58.510 -> 2024-04-19T00:00:03
// 16:15:59.505 -> 2024-04-19T00:00:04
// 16:16:00.514 -> 2024-04-19T00:00:05
// 16:16:01.512 -> 2024-04-19T00:00:06
// 16:16:02.506 -> 2024-04-19T00:00:07
// 16:16:03.530 -> 2024-04-19T00:00:08
// 16:16:04.530 -> 2024-04-19T00:00:09
// 16:16:05.523 -> 2024-04-19T00:00:10
// 16:16:06.525 -> 2024-04-19T00:00:11
// 16:16:07.509 -> 2024-04-19T00:00:12
// 16:16:08.514 -> 2024-04-19T00:00:13
// 16:16:09.514 -> 2024-04-19T00:00:14
// 16:16:10.545 -> 2024-04-19T00:00:15
// 16:16:11.534 -> 2024-04-19T00:00:16

// 3. Just disconnect & reconnect USB

// Time is kept.

// 16:17:07.584 -> 2024-04-19T00:01:12
// 16:17:08.604 -> 2024-04-19T00:01:13
// 16:17:09.595 -> 2024-04-19T00:01:14
// 16:17:10.583 -> 2024-04-19T00:01:15
// 16:17:11.602 -> 2024-04-19T00:01:16

// 3. Just disconnect LIPO

// Time is kept

// 16:18:45.206 -> 2024-04-19T00:02:49
// 16:18:46.194 -> 2024-04-19T00:02:50
// 16:18:47.216 -> 2024-04-19T00:02:51
// 16:18:48.207 -> 2024-04-19T00:02:52
// 16:18:49.228 -> 2024-04-19T00:02:53
// 16:18:50.218 -> 2024-04-19T00:02:54

// 3. Reconnect LIPO
// 4. Disconnect LIPO & USB
// 5. Reconnect LIPO followed by USB

// Time is reset
// I think this proves the little battery is not working in conjunction with the RTC to remember time.

// 16:20:34.022 -> 2024-04-19T00:00:05
// 16:20:35.036 -> 2024-04-19T00:00:06
// 16:20:36.039 -> 2024-04-19T00:00:07
// 16:20:37.031 -> 2024-04-19T00:00:08
// 16:20:38.020 -> 2024-04-19T00:00:09


void setup() {
  Serial.begin(115200);
  while(!Serial);
  delay(1000);
  Serial.println("RV-3028-C7 Set Date Time Example");
  Serial.println();

  Wire.begin(18, 17); // Initialize I2C communication with SDA on GPIO 18 and SCL on GPIO 17

  while (rtc.begin() == false) {
    Serial.println("Failed to detect RV-3028-C7!");
    delay(5000);
  }

  if (isRTCUnset() == true) {
    Serial.println("------");
    Serial.println("RTC Does NOT have time set");
    Serial.println("------");
    rtc.setDateTimeFromISO8601("2024-04-19T00:00:00");
    rtc.synchronize(); // Writes the new date time to RTC
  }
  else {
    Serial.println("------");
    Serial.println("RTC HAS time set");
    Serial.println("------");
  }

  Serial.println();
}

void loop() {
  Serial.println(rtc.getCurrentDateTime());
  delay(1000);
}

bool isRTCUnset() {
  // Get the current time from the RTC
  uint32_t currentTimestamp = getUnixTimestamp();

  // Calculate the Unix timestamp for the beginning of the year 2024
  uint32_t beginningOf2024 = 1706655600; // January 1, 2024

  // Check if the current time is before the beginning of the year 2024
  if (currentTimestamp < beginningOf2024) {
    return true; // RTC is unset
  } else {
    return false; // RTC is set
  }
}

uint32_t getUnixTimestamp() {
  return rtc.getUnixTimestamp();
}