File content as of revision 19:e5d8d6e7fac5:

#include "mbed.h"
#include "Adafruit_SSD1306.h"

#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

void Adafruit_SSD1306::begin(uint8_t vccstate)
{

    command(SSD1306_DISPLAYOFF);
    command(SSD1306_SETDISPLAYCLOCKDIV);
    command(0x80);                                  // the suggested ratio 0x80

    command(SSD1306_SETMULTIPLEX);
    command(_rawHeight-1);

    command(SSD1306_SETDISPLAYOFFSET);
    command(0x0);                                   // no offset

    command(SSD1306_SETSTARTLINE | 0x0);            // line #0

    command(SSD1306_CHARGEPUMP);
    command((vccstate == SSD1306_EXTERNALVCC) ? 0x10 : 0x14);

    command(SSD1306_MEMORYMODE);
    command(0x00);                                  // 0x0 act like ks0108

    command(SSD1306_SEGREMAP | 0x1);

    command(SSD1306_COMSCANDEC);

    command(SSD1306_SETCOMPINS);
    command(_rawHeight == 32 ? 0x02 : 0x12);        // TODO - calculate based on _rawHieght ?

    command(SSD1306_SETCONTRAST);
    command(_rawHeight == 32 ? 0x8F : ((vccstate == SSD1306_EXTERNALVCC) ? 0x9F : 0xCF) );

    command(SSD1306_SETPRECHARGE);
    command((vccstate == SSD1306_EXTERNALVCC) ? 0x22 : 0xF1);

    command(SSD1306_SETVCOMDETECT);
    command(0x40);

    command(SSD1306_DISPLAYALLON_RESUME);

    command(SSD1306_NORMALDISPLAY);
    
    command(SSD1306_DISPLAYON);
}

// Set a single pixel
void Adafruit_SSD1306::drawPixel(int16_t x, int16_t y, uint16_t color)
{
    if ((x < 0) || (x >= width()) || (y < 0) || (y >= height()))
        return;
    
    
    
    // x is which column
    if (color == WHITE) 
        buffer[x+ (y/8)*_rawWidth] |= _BV((y%8));  
    else // else black
        buffer[x+ (y/8)*_rawWidth] &= ~_BV((y%8)); 
}

void Adafruit_SSD1306::invertDisplay(bool i)
{
	command(i ? SSD1306_INVERTDISPLAY : SSD1306_NORMALDISPLAY);
}

// Send the display buffer out to the display
void Adafruit_SSD1306::display(void)
{
	command(SSD1306_SETLOWCOLUMN | 0x0);  // low col = 0
	command(SSD1306_SETHIGHCOLUMN | 0x0);  // hi col = 0
	command(SSD1306_SETSTARTLINE | 0x0); // line #0
	sendDisplayBuffer();
}

// Clear the display buffer. Requires a display() call at some point afterwards
void Adafruit_SSD1306::clearDisplay(void)
{
	std::fill(buffer.begin(),buffer.end(),0);
}