File content as of revision 2:730476ff1e87:

#include "mbed.h"
#include "Adafruit_SSD1306.h"
//------------------------------------
// Hyperterminal configuration
// 9600 bauds, 8-bit data, no parity
//------------------------------------

// SSD1306 OLED AND Nucleo L432KC
// 2016.10.23
// 2016.10.23 changed
Serial pc(SERIAL_TX, SERIAL_RX);
 
DigitalOut myled(LED3);
AnalogIn adc(A0);

#define DO A4
#define DI A6
#define CS D9
#define DC A1
#define RST D7

class SPIPreInit : public SPI
{
public:
    SPIPreInit(PinName mosi, PinName miso, PinName clk) : SPI(mosi,miso,clk) {
        format(8,3);
        frequency(2000000);
    };
};
 
SPIPreInit mySpi(DI,NC,DO);
Adafruit_SSD1306_Spi oled(mySpi,DC,RST,CS,64,128);

 
 
int main() {
  int i = 1;
  int x =0;
  oled.clearDisplay();
  oled.setTextSize(2);
  while(1) { 
  
  
  x++;
  oled.printf("%d %2.3f V\r\n", x, adc.read()*3300/1000);
  oled.display();
  wait(0.5);
  pc.printf("%d %2.3f V\r\n", i++, adc.read()*3300/1000);
  myled = !myled;
  if(x>3) {
  oled.setTextCursor(0,0);
  oled.clearDisplay();
  x=0;
  }
  }
}