text: #ifndef _U8G_STM32_H
  #define _U8G_STM32_H
  
  #include "u8g.h"
  #include "Arduino.h"
  
  #define DATA_BUFFER_SIZE 1000
  #define I2C_TIMEOUT 10000
  #define DEVICE_ADDRESS 0x78 //device address is written on back side of your display
  #define MASTER_ADDRESS 0x33
  //#define SDA 22 // PB7
  //#define SCL 10 // PB6
  #define SDA 14 // PB9
  #define SCL 15 // PB8
  
  uint8_t u8g_com_hw_i2c_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr);
  #endif 
  