// U8g2 library is used for monochrome GLCD
#include <U8g2lib.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(
  U8G2_R0,
  U8X8_PIN_NONE,  // reset
  22,             // clock (SCL)
  21              // data (SDA)
);

void setup() {
  // Init UART
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  // Init LCD
  u8g2.begin();
  u8g2.enableUTF8Print();
}

void loop() {
  // clear the internal memory
  u8g2.clearBuffer();

  // choose a suitable font
  u8g2.setFont(u8g2_font_ncenB08_tr);
  // write something to the internal memory
  u8g2.drawStr(0, 10, "Hello!");

  // choose a farsi font
  u8g2.setFont(u8g2_font_samim_10_t_all);
  u8g2.drawUTF8(0, 30, "!ﻡﻼﺳ");

  // transfer internal memory to the display
  u8g2.sendBuffer();
  delay(1000);
}