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/*********************************************************************

This is a library for our Monochrome OLEDs based on SSD1306 drivers

  Pick one up today in the adafruit shop!

  ------> http://www.adafruit.com/category/63_98

These displays use SPI to communicate, 4 or 5 pins are required to  

interface

Adafruit invests time and resources providing this open source code,

please support Adafruit and open-source hardware by purchasing

products from Adafruit!

Written by Limor Fried/Ladyada  for Adafruit Industries.  

BSD license, check license.txt for more information

All text above, and the splash screen must be included in any redistribution

*********************************************************************/

typedef uint8_t boolean;

static const boolean true = 1;

static const boolean false = 0;

#define BLACK  0

#define WHITE  1

#define INVERT 2

// this driver can cope with more than one physical display of the same type.

#define MAX_PHYS_DISPLAYS 2

/*=========================================================================

    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

    -----------------------------------------------------------------------*/

        #define SSD1306_128_64

/*=========================================================================*/

#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_COLUMNADDR 0x21

#define SSD1306_PAGEADDR   0x22

#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

extern const uint16_t WIDTH;

extern const uint16_t HEIGHT;

extern uint8_t display_buffer[MAX_PHYS_DISPLAYS][SSD1306_LCDHEIGHT * SSD1306_LCDWIDTH / 8];

extern inline uint8_t getRotation(void);

extern inline int16_t width(void);

extern inline int16_t height(void);

extern inline void fastSPIwrite(uint8_t d);

/* stolen from AdaFruit class and converted to C */

void ssd1306_begin(uint8_t vccstate, uint8_t i2caddr);

extern  void ssd1306_command(uint8_t c);

extern  void ssd1306_data(uint8_t c);

extern  void clearDisplay(void);

extern  void invertDisplay(uint8_t i);

extern  void display();

extern  void startscrollright(uint8_t start, uint8_t stop);

extern  void startscrollleft(uint8_t start, uint8_t stop);

extern  void startscrolldiagright(uint8_t start, uint8_t stop);

extern  void startscrolldiagleft(uint8_t start, uint8_t stop);

extern  void stopscroll(void);

extern void dim(uint8_t contrast);

 extern inline void drawPixel(int16_t x, int16_t y, uint16_t color);

  void drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color);

  void drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color);

  inline void drawFastVLineInternal(int16_t x, int16_t y, int16_t h, uint16_t color) __attribute__((always_inline));

  inline void drawFastHLineInternal(int16_t x, int16_t y, int16_t w, uint16_t color) __attribute__((always_inline));

  extern void drawLine(int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint8_t color);

  extern  void select_display(int i) ; // select physical display [i]

  extern  inline uint8_t * display_address(void) ;