#if ARDUINO >= 100
 #include "Arduino.h"
#else
 #include "WProgram.h"
#endif

#define BLACK 0
#define WHITE 1

#define SSD1306_I2C_ADDRESS   0x3C	// 011110+SA0+RW - 0x3C or 0x3D
// Address for 128x32 is 0x3C
// Address for 128x32 is 0x3D (default) or 0x3C (if SA0 is grounded)

/*=========================================================================
    SSD1306 Displays
    -----------------------------------------------------------------------
    The driver is used in multiple displays (128x64, 128x32, etc.).
    Select the appropriate display below to create an appropriately
    sized framebuffer, etc.

    SSD1306_128_64  128x64 pixel display

    SSD1306_128_32  128x32 pixel display

    You also need to set the LCDWIDTH and LCDHEIGHT defines to an
    appropriate size

    -----------------------------------------------------------------------*/
   #define SSD1306_128_64
//   #define SSD1306_128_32
/*=========================================================================*/

#if defined SSD1306_128_64 && defined SSD1306_128_32
  #error "Only one SSD1306 display can be specified at once in SSD1306.h"
#endif
#if !defined SSD1306_128_64 && !defined SSD1306_128_32
  #error "At least one SSD1306 display must be specified in SSD1306.h"
#endif

#if defined SSD1306_128_64
  #define SSD1306_LCDWIDTH                  128
  #define SSD1306_LCDHEIGHT                 64
#endif
#if defined SSD1306_128_32
  #define SSD1306_LCDWIDTH                  128
  #define SSD1306_LCDHEIGHT                 32
#endif

#define SSD1306_SETCONTRAST 0x81
#define SSD1306_DISPLAYALLON_RESUME 0xA4
#define SSD1306_DISPLAYALLON 0xA5
#define SSD1306_NORMALDISPLAY 0xA6
#define SSD1306_INVERTDISPLAY 0xA7
#define SSD1306_DISPLAYOFF 0xAE
#define SSD1306_DISPLAYON 0xAF

#define SSD1306_SETDISPLAYOFFSET 0xD3
#define SSD1306_SETCOMPINS 0xDA

#define SSD1306_SETVCOMDETECT 0xDB

#define SSD1306_SETDISPLAYCLOCKDIV 0xD5
#define SSD1306_SETPRECHARGE 0xD9

#define SSD1306_SETMULTIPLEX 0xA8

#define SSD1306_SETLOWCOLUMN 0x00
#define SSD1306_SETHIGHCOLUMN 0x10

#define SSD1306_SETSTARTLINE 0x40

#define SSD1306_MEMORYMODE 0x20

#define SSD1306_COMSCANINC 0xC0
#define SSD1306_COMSCANDEC 0xC8

#define SSD1306_SEGREMAP 0xA0

#define SSD1306_CHARGEPUMP 0x8D

#define SSD1306_EXTERNALVCC 0x1
#define SSD1306_SWITCHCAPVCC 0x2

// Scrolling #defines
#define SSD1306_ACTIVATE_SCROLL 0x2F
#define SSD1306_DEACTIVATE_SCROLL 0x2E
#define SSD1306_SET_VERTICAL_SCROLL_AREA 0xA3
#define SSD1306_RIGHT_HORIZONTAL_SCROLL 0x26
#define SSD1306_LEFT_HORIZONTAL_SCROLL 0x27
#define SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL 0x29
#define SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL 0x2A

class SSD1306 {
public:
  SSD1306(int8_t SCLK, int8_t DC, int8_t RST, int8_t CS);
  SSD1306(int8_t RST = 4);

  void begin(uint8_t switchvcc = SSD1306_SWITCHCAPVCC, uint8_t i2caddr = SSD1306_I2C_ADDRESS);
  void ssd1306_command(uint8_t c);
  void ssd1306_data(uint8_t c);

  void invertDisplay(uint8_t i);
  void draw8x8(byte* buffer, byte x, byte y);

  void startscrollright(uint8_t start, uint8_t stop);
  void startscrollleft(uint8_t start, uint8_t stop);

  void startscrolldiagright(uint8_t start, uint8_t stop);
  void startscrolldiagleft(uint8_t start, uint8_t stop);
  void stopscroll(void);

  void fill(unsigned char dat);
  void clearBuffer();

protected:
  uint8_t _i2caddr;
private:
  int8_t sclk, dc, rst, cs;
};