#include <Wire.h>

#define MIRQ 2

unsigned long timing;

void conf() {
  TWBR = 0xff;
  TWSR = 0x01;
  //TWCR &= ~(1<<TWEA);
}

void sendStringToDisplay(char* str, bool dotPointEnable = false) {
  Wire.beginTransmission(0x23);
  //byte[] packet = { 0x0C, 0x90, 0x7E, 0x71, 0x01, }
  Wire.write(0x0F);
  Wire.write(0x90);
  Wire.write(0x7F); 
  Wire.write(0xFF); //19 traffic on ? 55 ?
  Wire.write(0xFF);
  Wire.write(0xFF); //7F traffic on ?    //FD ? 
  Wire.write(0x71); // PRESET
  Wire.write(0x01); // DOT POINT //A5 ?
  Wire.write(str[0]);
  Wire.write(str[1]);
  Wire.write(str[2]);
  Wire.write(str[3]);
  Wire.write(str[4]);
  Wire.write(str[5]);
  Wire.write(str[6]);
  Wire.write(str[7]);
}

/*
0x19  0001 1001
0x55  0101 0101
*/

void setup() {
  Serial.begin(9600);
  Wire.begin();
  conf();
  //Wire.setClock(10000);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(MIRQ, INPUT_PULLUP);
}

void up() {
  pinMode(MIRQ, INPUT_PULLUP);
}

void down() {
  pinMode(MIRQ, OUTPUT);
  digitalWrite(MIRQ, LOW);
}

bool initialized = false;

void loop() {
  if (millis() - timing > 2000) {  // Обновление данных на дисплее
    Serial.println("WRITING");
    while (!digitalRead(MIRQ))
      ;
    if (digitalRead(MIRQ)) {
      delay(1);
      down();
      Wire.beginTransmission(0x23);
      conf();
      Wire.write(0x01);
      Wire.write(0x11);
      Wire.endTransmission();
      up();
      delay(1);
    }

    while (!digitalRead(MIRQ))
      ;
    if (digitalRead(MIRQ)) {
      down();
      sendStringToDisplay("HELLO", true);
      Wire.endTransmission();
      up();
      delay(1);
    }
    digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
    timing = millis();
  }
}