File content as of revision 4:83b4e905be5b:

/* mbed Seeed 128x64 OLED Test
 * http://www.seeedstudio.com/depot/grove-oled-display-12864-p-781.html?cPath=163_167
 *
 * Copyright (c) 2012 Wim Huiskamp
 * Released under the MIT License: http://mbed.org/license/mit
 *
 * version 0.2 Initial Release
 */
#include "mbed.h"
#include "mbed_logo.h"
#include "SSD1308.h"


//Pin Defines for I2C Bus
//#define D_SDA                  p9
//#define D_SCL                  p10
#define D_SDA                  p28
#define D_SCL                  p27
I2C i2c(D_SDA, D_SCL);

//Host PC Baudrate (Virtual Com Port on USB)
#define D_BAUDRATE            9600
//#define D_BAUDRATE            57600

// mbed Interface Hardware definitions
DigitalOut myled1(LED1);
DigitalOut myled2(LED2);
DigitalOut myled3(LED3);
DigitalOut heartbeatLED(LED4);

// Host PC Communication channels
Serial pc(USBTX, USBRX); // tx, rx

// Instantiate OLED
SSD1308 oled = SSD1308(i2c, SSD1308_SA0);

void show_menu() {
    pc.printf("0: Exit\r");
    pc.printf("1: Show Menu\r");    
    pc.printf("2: Send Message\r"); 
    pc.printf("3: Fill Display\r");
    pc.printf("4: Display cleared\r");        
    pc.printf("5: Display off\r");            
    pc.printf("6: Display on\r");                
    pc.printf("7: Display Invert\r");                    
    pc.printf("8: Display Normal\r");                
    pc.printf("9: Display Bitmap\r");                    
    pc.printf("A: Brightness Ramp\r");                    
    pc.printf("B: Send Inverted Message\r");  
    pc.printf("C: Flip and Mirror\r");                      
    pc.printf("D: Blink\r");   
    pc.printf("E: Big Chars\r");                       

//    pc.printf("E: \n\r");                                
//    pc.printf("F: \n\r");                                    
//    pc.printf("\n\r");                
     
}


void oled_Test() {
  pc.printf("OLED test start\r");  
  
  oled.writeString(0, 0, 13, "Hello World !");
  pc.printf("Printed something\r\n");    
  wait(3);
    
  oled.writeString(1, 0, 8, "baz quux");
  pc.printf("Printed something\r\n");  
  wait(3);
    
//  oled.writeString(4, 0, 272, "a long, rather lengthy, extended string passage thing, eh, that just goes on, and on, and on, and on, and on, and on, and on, yes, further, continuing, extending, expanding beyond all reason or sanity!!!!! and yet, there's more!  so much more!  for ever and ever, oh yeah");
//  pc.printf("Printed something\r\n");
//  wait(3);

  oled.fillDisplay(0xAA);
  pc.printf("Display filled\r\n");      
  wait(3);

  oled.setDisplayOff();
  pc.printf("Display off\r\n");          
  wait(0.5);

  oled.setDisplayOn();
  pc.printf("Display on\r\n");          
  wait(0.5);  

  oled.clearDisplay();
  pc.printf("Display cleared\r\n");        
  wait(0.5);

  oled.writeString(0, 0, 11, "Bye World !");
  pc.printf("Printed something\r\n");    
  wait(3);

  pc.printf("OLED test done\r\n");  
}

// Variables for Heartbeat and Status monitoring
Ticker heartbeat;
bool heartbeatflag=false;

// Local functions
void clear_screen() {
//ANSI Terminal Commands
    pc.printf("\x1B[2J");
    pc.printf("\x1B[H");
}


void init_interfaces() {
    // Init Host PC communication, default is 9600
    pc.baud(D_BAUDRATE);
      
    // Init I/F hardware
//    i2c.frequency(100000);
    i2c.frequency(400000); // according to the spec the max bitrate for the SSD1308 is 400 kbit/s
}
      

// Heartbeat monitor
void pulse() {
  heartbeatLED = !heartbeatLED;
}

void heartbeat_start() {
  heartbeat.attach(&pulse, 0.5);
}

void heartbeat_stop() {
  heartbeat.detach();
}


int main() {
    bool running=true;
    bool left = true;
    bool down = true;
   
    char command;

    init_interfaces();
    
    heartbeat_start();
          
    clear_screen(); 
  
    pc.printf("Hello World!\n\r");

#if(0)
// Quick test
    oled_Test(); 
    
    while(1) {
        myled1 = 1;
        wait(0.2);       
         
        myled1 = 0;
        wait(0.2);     
        pc.printf("*");
    }
#else    
// Interactive Test
    show_menu();
      
    while(running) {
          
       if(pc.readable()) {
         command = pc.getc();       
         //pc.printf("command= %c \n\r", command);         
         pc.printf("\r");         
         
         switch (command) {
          case '0' :
                     pc.printf("Done\n\r");                    
                     running = false;  
                     break;
          
          case '1' :
                     show_menu();
                     break;
                    
          case '2' :
                     pc.printf("Hello World!\n\r");  
                     oled.writeString(0, 0, 13, "Hello World !");                            
                     break;
          
          case '3' :
                     pc.printf("Fill part of Display 0xA5\n\r");            
//                     oled.fillDisplay(0xA5);
                     
                     oled.fillDisplay(0xA5, 2, 5, 0, 63);                     
                     break;

          case '4' :
                     pc.printf("Display cleared\r\n");                  
                     oled.clearDisplay();
                     break;

          case '5' :
                     pc.printf("Display off\r\n");                
                     oled.setDisplayOff();                  
                     break;
          case '6' :
                     pc.printf("Display on\r\n");          
                     oled.setDisplayOn();                     
                     break;

          case '7' :
                     pc.printf("Display Invert\r\n");          
                     oled.setDisplayInverse();
                     break;

          case '8' :
                     pc.printf("Display Normal\r\n");
                     oled.setDisplayNormal();                                         
                     break;

          case '9' :
                     pc.printf("Display bitmap\r\n");          
                     oled.writeBitmap((uint8_t*) mbed_logo);
                                        
                     break;

          case 'A' :

                     pc.printf("Brightness Ramp Down\r\n");          
                     for (int contrast=0x7F; contrast >= 0x10; contrast--) { 
                        oled.setContrastControl(contrast);
                        wait(0.05);
                     }                   
                     
                     wait(1);

                     pc.printf("Brightness Ramp Up\r\n");          
                     for (int contrast=0x10; contrast <= 0x7F; contrast++) { 
                        oled.setContrastControl(contrast);
                        wait(0.05);
                     }                   

                     pc.printf("Brightness Ramp Done\r\n");                              
                     
                     break;

          case 'B' :
                     pc.printf("Send Inverted Message\n\r");
                     oled.setInverted(true);                     
                     oled.writeString(0, 0, 13, "Hello World !");                                                 
                     oled.setInverted(false);                                          

                     oled.printf(" Result is %d", 12345);                                                 

                     break;
                     
          case 'C' :
                     pc.printf("Flip and Mirror (Rewrite display to show horizontal effect)\n\r");
                     left = !left;
                     down = !down;
                     oled.setDisplayFlip(left, down);                     
                     break;
          
          case 'D' :                     
                     pc.printf("D: Blink and Fade (not supported) \n\r");

//                     oled.setDisplayBlink(true);
//                     wait(4);
//                     oled.setDisplayBlink(false);

                     oled.setDisplayFade(true);
                     wait(4);
                     oled.setDisplayFade(false);
                     
                     pc.printf("D: Blink done\n\r");
                     break;   
                    
                     
          case 'E' :                     
                     pc.printf("E: Big Chars\n\r");
                     
                     oled.writeBigChar(0,  0, '+');
                     oled.writeBigChar(0, 16, '7');
                     oled.writeBigChar(0, 32, '8');
                     oled.writeBigChar(0, 48, '9');                                          
                     
                     pc.printf("E: Big Chars done\n\r");
                     break;   
                                                                                       
        } //switch
      }//if
    }//while
#endif

    pc.printf("Bye World!\n\r");                       
}//main