#include <Wire.h>

byte
  setupData[1] = { 0b00010000 },
  iniData[3] = { 0b01011001, 0b01011001, 0b00100011 };

void writeData(byte addr, byte *bytes, int n) {
  Wire.beginTransmission(0b1101000);
  Wire.write(addr);
  Wire.write(bytes, n);
  Wire.endTransmission();
}

void readData(byte addr, byte *bytes, int n) {
  Wire.beginTransmission(0b1101000);
  Wire.write(addr);
  Wire.endTransmission();

  Wire.requestFrom(0b1101000, 3);
  for (int i = 0; i < n; ++i)
    bytes[i] = Wire.read();
}

void updateTime() {
  byte timeData[3] = {0};
  readData(0b00000000, timeData, 3);

  Serial.print(((timeData[2] & 0b00110000) >> 4) * 10 + (timeData[2] & 0b00001111));
  Serial.print(":");
  Serial.print(((timeData[1] & 0b01110000) >> 4) * 10 + (timeData[1] & 0b00001111));
  Serial.print(":");
  Serial.println(((timeData[0] & 0b01110000) >> 4) * 10 + (timeData[0] & 0b00001111));
}

void setup() {
  Serial.begin(115200);

  Wire.begin();
  writeData(0b00000111, setupData, 1);
  writeData(0b00000000, iniData, 3);
}

void loop() {
  updateTime();

  delay(1000);
}