File content as of revision 1:ae0b11ca17d1:

#include "mbed.h"
#include "Adafruit_SSD1306.h"   // Adafruit_GFX library

Serial pc(SERIAL_TX, SERIAL_RX);
DigitalOut  myled(LED1);
DigitalOut  redLed(PA_12);
DigitalIn   myButton(PC_13);
DigitalIn   exButton(PC_11);

BusOut my7Seg(PA_8, PA_9, PA_10, PC_9, PC_8, PC_7, PC_6, PA_11); // 8bit data
            // LSB,                                      , MSB
char    val7Seg[16] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F,
                        0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71};

char rxData[5];
bool flagRx = 0;

int main()
{   
    I2C     I2C_Oled(PB_7, PA_15);       // SDA, SCL
    I2C_Oled.frequency(400000);     // 400kHz clock
    
    Adafruit_SSD1306_I2c    myOled(I2C_Oled, PA_1);    //  D2

    myOled.splash();      // logo output
    myOled.display();
    wait(0.5);
    
    myOled.clearDisplay();  // clear buffer     
    myOled.printf("%u x %u OLED Display\r\n", myOled.width(), myOled.height());
    myOled.display();       // show a image on the OLED
    wait(1);
 
    uint16_t n = 0;
    
    while(1)
    {
        myled = !myled;

        myOled.clearDisplay();      
        myOled.setTextCursor(1, 5);
        myOled.printf("<<< UNIST DHE: %u >>>",n++);
        myOled.display();
        wait(0.1);
    }
}