/*********************************************************************
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 uint8_t getRotation(void);
extern int16_t width(void);
extern int16_t height(void);

extern 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 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) ;