// Init sequence for 128x64 OLED module
   SSD1306_WRITECOMMAND(SH1106_DISPLAYOFF);                    // 0xAE
   SSD1306_WRITECOMMAND(SH1106_SETDISPLAYCLOCKDIV);            // 0xD5
  SSD1306_WRITECOMMAND(SH1106_MEMORYMODE);                    // 0x20
   SSD1306_WRITECOMMAND(0x80);                                  // the suggested ratio 0x80
   SSD1306_WRITECOMMAND(SH1106_SETMULTIPLEX);                  // 0xA8
   SSD1306_WRITECOMMAND(0x3F);
   SSD1306_WRITECOMMAND(SH1106_SETDISPLAYOFFSET);              // 0xD3
   SSD1306_WRITECOMMAND(0x00);                                   // no offset

   SSD1306_WRITECOMMAND(SH1106_SETSTARTLINE | 0x0);            // line #0 0x40
   SSD1306_WRITECOMMAND(SH1106_CHARGEPUMP);                    // 0x8D
   SSD1306_WRITECOMMAND(0x10);
   SSD1306_WRITECOMMAND(0x00);                                  // 0x0 act like ks0108
   SSD1306_WRITECOMMAND(SH1106_SEGREMAP | 0x1);
   SSD1306_WRITECOMMAND(SH1106_COMSCANDEC);
   SSD1306_WRITECOMMAND(SH1106_SETCOMPINS);                    // 0xDA
   SSD1306_WRITECOMMAND(0x12);
   SSD1306_WRITECOMMAND(SH1106_SETCONTRAST);                   // 0x81
   // if (vccstate == SH1106_EXTERNALVCC)
   //   {SSD1306_WRITECOMMAND(0x9F); }
   // else
    SSD1306_WRITECOMMAND(0xCF);
   SSD1306_WRITECOMMAND(SH1106_SETPRECHARGE);                  // 0xd9
   // if (vccstate == SH1106_EXTERNALVCC)
   SSD1306_WRITECOMMAND(0x22);
   // else
   //SSD1306_WRITECOMMAND(SH1106_SETVCOMDETECT);                 // 0xDB
   SSD1306_WRITECOMMAND(0x40);
   SSD1306_WRITECOMMAND(SH1106_DISPLAYALLON_RESUME);           // 0xA4
   SSD1306_WRITECOMMAND(SH1106_NORMALDISPLAY);     
  SSD1306_WRITECOMMAND(SH1106_MEMORYMODE);                    // 0x20