#define SSD1306_COMSCANDEC 0xC8
#define SSD1306_SEGREMAP 0xA0
#define SSD1306_CHARGEPUMP 0x8D
-#define SSD1306_INTERNALVCC 0x1
#define SSD1306_EXTERNALVCC 0x1
+#define SSD1306_INTERNALVCC 0x2
#define SSD1306_SWITCHCAPVCC 0x2
// Initialisation/Config Prototypes