Subversion Repositories libOLED

/*

 * displayclass.cpp

 *

 *  Created on: 31 Oct 2020

 *      Author: mike

 */

#include "libOLED/displayclass.H"

#include <cstring>

#include <cstdlib>

namespace

{

  uint8_t const SSD1306_SETCONTRAST = 0x81;

  uint8_t const SSD1306_DISPLAYALLON_RESUME = 0xA4;

  uint8_t const SSD1306_DISPLAYALLON = 0xA5;

  uint8_t const SSD1306_NORMALDISPLAY = 0xA6;

  uint8_t const SSD1306_INVERTDISPLAY = 0xA7;

  uint8_t const SSD1306_DISPLAYOFF = 0xAE;

  uint8_t const SSD1306_DISPLAYON = 0xAF;

  uint8_t const SSD1306_SETDISPLAYOFFSET = 0xD3;

  uint8_t const SSD1306_SETCOMPINS = 0xDA;

  uint8_t const SSD1306_SETVCOMDETECT = 0xDB;

  uint8_t const SSD1306_SETDISPLAYCLOCKDIV = 0xD5;

  uint8_t const SSD1306_SETPRECHARGE = 0xD9;

  uint8_t const SSD1306_SETMULTIPLEX = 0xA8;

  uint8_t const SSD1306_SETLOWCOLUMN = 0x00;

  uint8_t const SSD1306_SETHIGHCOLUMN = 0x10;

  uint8_t const SSD1306_SETSTARTLINE = 0x40;

  uint8_t const SSD1306_MEMORYMODE = 0x20;

  uint8_t const SSD1306_COLUMNADDR = 0x21;

  uint8_t const SSD1306_PAGEADDR = 0x22;

  uint8_t const SSD1306_COMSCANINC = 0xC0;

  uint8_t const SSD1306_COMSCANDEC = 0xC8;

  uint8_t const SSD1306_SEGREMAP = 0xA0;

  uint8_t const SSD1306_CHARGEPUMP = 0x8D;

  uint8_t const SSD1306_EXTERNALVCC = 0x1;

  uint8_t const SSD1306_SWITCHCAPVCC = 0x2;

  // Scrolling #defines

  uint8_t const SSD1306_ACTIVATE_SCROLL = 0x2F;

  uint8_t const SSD1306_DEACTIVATE_SCROLL = 0x2E;

  uint8_t const SSD1306_SET_VERTICAL_SCROLL_AREA = 0xA3;

  uint8_t const SSD1306_RIGHT_HORIZONTAL_SCROLL = 0x26;

  uint8_t const SSD1306_LEFT_HORIZONTAL_SCROLL = 0x27;

  uint8_t const SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL = 0x29;

  uint8_t const SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL = 0x2A;

  template <class T>

  void

  swap(T &x, T &y)

  {

    T temp = x;

    x = y;

    y = temp;

  }

  template <class T>

  T abs(T x)

  {

    return x < 0 ? -x : x;

  }

}

// provided to allow a destructor to destroy something not deleted

// this is only OK because destructors shouldnt be needed

void operator delete(void *data, unsigned int f)

{

  (void)data;

  (void)f;

}

// provided to implement an "error handler" on pure virtual

extern "C" void

__cxa_pure_virtual()

{

  while (1)

    ;

}

display_t::display_t(int const width, int const height, int const ramwidth,

                     uint8_t *const data) : m_width(width), m_height(height), m_ramwidth(ramwidth), m_cursor_x(0), m_cursor_y(0), m_rotation(0), m_colour(WHITE), m_data(data)

{

}

display_t::~display_t()

{

}

void display_t::reset()

{

  oledReset();

}

void display_t::init()

{

  uint8_t const vccstate = SSD1306_EXTERNALVCC;

  oledSetCD(0);

  // Init sequence for 128x32 or 128x64  OLED module

  oledWrite(SSD1306_DISPLAYOFF);         // 0xAE

  oledWrite(SSD1306_SETDISPLAYCLOCKDIV); // 0xD5

  oledWrite(0x80);                       // the suggested ratio 0x80

  oledWrite(SSD1306_SETMULTIPLEX);       // 0xA8

  oledWrite(m_height - 1);

  oledWrite(SSD1306_SETDISPLAYOFFSET);   // 0xD3

  oledWrite(0x0);                        // no offset

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

  oledWrite(SSD1306_CHARGEPUMP);         // 0x8D

  oledWrite(vccstate == SSD1306_EXTERNALVCC ? 0x10 : 0x14);

  oledWrite(SSD1306_MEMORYMODE); // 0x20

  oledWrite(0x00);               // 0x0 act like ks0108

  oledWrite(SSD1306_SEGREMAP | 0x1);

  oledWrite(SSD1306_COMSCANDEC);

  oledWrite(SSD1306_SETCOMPINS); // 0xDA

  oledWrite(m_height == 32 ? 0x02 : 0x12);

  oledWrite(SSD1306_SETCONTRAST); // 0x81

  oledWrite(vccstate == SSD1306_EXTERNALVCC ? 0x9F : 0xCF);

  oledWrite(SSD1306_SETPRECHARGE); // 0xd9

  oledWrite(vccstate == SSD1306_EXTERNALVCC ? 0x22 : 0xF1);

  oledWrite(SSD1306_SETVCOMDETECT); // 0xDB

  oledWrite(0x40);

  oledWrite(SSD1306_DISPLAYALLON_RESUME); // 0xA4

  oledWrite(SSD1306_NORMALDISPLAY);       // 0xA6

  oledWrite(SSD1306_DISPLAYON); //--turn on oled panel

  clearDisplay();

}

uint8_t

display_t::getRotation(void)

{

  return m_rotation;

}

int16_t

display_t::width(void)

{

  switch (m_rotation)

  {

  case 0:

    return m_width;

    break;

  case 1:

    return m_width;

    break;

  case 2:

    return m_height;

    break;

  case 3:

    return -m_width;

    break;

  }

  return 0;

}

int16_t

display_t::height(void)

{

  switch (m_rotation)

  {

  case 0:

    return m_height;

    break;

  case 1:

    return m_height;

    break;

  case 2:

    return m_width;

    break;

  case 3:

    return -m_height;

    break;

  }

  return 0;

}

// the most basic function, set a single pixel

void display_t::drawPixel(int16_t x, int16_t y, bool pixel)

{

  if ((x < 0) || (x >= m_width) || (y < 0) || (y >= m_height))

    return;

  // check rotation, move pixel around if necessary

  switch (m_rotation)

  {

  case 1:

    swap(x, y);

    x = m_width - x - 1;

    break;

  case 2:

    x = m_width - x - 1;

    y = m_height - y - 1;

    break;

  case 3:

    swap(x, y);

    y = m_height - y - 1;

    break;

  }

  // x is which column

  //  BLACK,  and 0,             invert 0

  //  WHITE,   and 0,            invert 1

  //  OVERLAY, and 1 (preserve) , invert 0/

  // INVERT,  and 1, (preserve) , invert 1

  switch (m_colour)

  {

  case BLACK:

  case WHITE:

    m_data[x + (y / 8) * m_width] &= ~(1 << (y & 7));

    break;

  default:

    break;

  }

  uint8_t pixData = 0;

  switch (m_colour)

  {

  case BLACK:

    pixData = pixel ? 0 : 1;

    break;

  case WHITE:

  case OVERLAY:

  case INVERT:

    pixData = pixel ? 1 : 0;

    break;

  }

  m_data[x + (y / 8) * m_width] ^= (pixData << (y & 7));

}

void display_t::invertDisplay(uint8_t i)

{

  oledSetCD(0);

  oledWrite(i ? SSD1306_INVERTDISPLAY : SSD1306_NORMALDISPLAY);

}

// startscrollright

// Activate a right handed scroll for rows start through stop

// Hint, the display is 16 rows tall. To scroll the whole display, run:

// display.scrollright(0x00, 0x0F)

void display_t::startscrollright(uint8_t start, uint8_t stop)

{

  oledSetCD(0);

  oledWrite(SSD1306_RIGHT_HORIZONTAL_SCROLL);

  oledWrite(0X00);

  oledWrite(start);

  oledWrite(0X00);

  oledWrite(stop);

  oledWrite(0X00);

  oledWrite(0XFF);

  oledWrite(SSD1306_ACTIVATE_SCROLL);

}

// startscrollleft

// Activate a right handed scroll for rows start through stop

// Hint, the display is 16 rows tall. To scroll the whole display, run:

// display.scrollright(0x00, 0x0F)

void display_t::startscrollleft(uint8_t start, uint8_t stop)

{

  oledSetCD(0);

  oledWrite(SSD1306_LEFT_HORIZONTAL_SCROLL);

  oledWrite(0X00);

  oledWrite(start);

  oledWrite(0X00);

  oledWrite(stop);

  oledWrite(0X00);

  oledWrite(0XFF);

  oledWrite(SSD1306_ACTIVATE_SCROLL);

}

// startscrolldiagright

// Activate a diagonal scroll for rows start through stop

// Hint, the display is 16 rows tall. To scroll the whole display, run:

// display.scrollright(0x00, 0x0F)

void display_t::startscrolldiagright(uint8_t start, uint8_t stop)

{

  oledSetCD(0);

  oledWrite(SSD1306_SET_VERTICAL_SCROLL_AREA);

  oledWrite(0X00);

  oledWrite(m_height);

  oledWrite(SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL);

  oledWrite(0X00);

  oledWrite(start);

  oledWrite(0X00);

  oledWrite(stop);

  oledWrite(0X01);

  oledWrite(SSD1306_ACTIVATE_SCROLL);

}

// startscrolldiagleft

// Activate a diagonal scroll for rows start through stop

// Hint, the display is 16 rows tall. To scroll the whole display, run:

// display.scrollright(0x00, 0x0F)

void display_t::startscrolldiagleft(uint8_t start, uint8_t stop)

{

  oledSetCD(0);

  oledWrite(SSD1306_SET_VERTICAL_SCROLL_AREA);

  oledWrite(0X00);

  oledWrite(m_height);

  oledWrite(SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL);

  oledWrite(0X00);

  oledWrite(start);

  oledWrite(0X00);

  oledWrite(stop);

  oledWrite(0X01);

  oledWrite(SSD1306_ACTIVATE_SCROLL);

}

void display_t::stopscroll(void)

{

  oledSetCD(0);

  oledWrite(SSD1306_DEACTIVATE_SCROLL);

}

// Dim the display

// dim = true: display is dimmed

// dim = false: display is normal

void display_t::dim(uint8_t contrast)

{

  // the range of contrast to too small to be really useful

  // it is useful to dim the display

  oledSetCD(0);

  oledWrite(SSD1306_SETCONTRAST);

  oledWrite(contrast);

}

void display_t::display(void)

{

  oledSetCD(0);

  // select entire display as window to write into

  oledWrite(SSD1306_COLUMNADDR);

  oledWrite(0);              // Column start address (0 = reset)

  oledWrite(m_ramwidth - 1); // Column end address (127 = reset)

  oledWrite(SSD1306_PAGEADDR);

  oledWrite(0);                        // Page start address (0 = reset)

  oledWrite((m_height == 64) ? 7 : 3); // Page end address

  int row;

  int col = m_ramwidth == 132 ? 2 : 0;

  for (row = 0; row < m_height / 8; row++)

  {

    oledSetCD(0);

    // set the cursor to

    oledWrite(0xB0 + row);        // set page address

    oledWrite(col & 0xf);         // set lower column address

    oledWrite(0x10 | (col >> 4)); // set higher column address

    oledSetCD(1);

    oledWrite(m_data + row * m_width, m_width);

  }

}

// clear everything

void display_t::clearDisplay(colour_t colour)

{

  switch (colour)

  {

  case WHITE:

  case OVERLAY:

    memset(m_data, 255, dataSize(m_width, m_height));

    break;

  case BLACK:

    memset(m_data, 0, dataSize(m_width, m_height));

    break;

  case INVERT:

    for (size_t i = 0; i < dataSize(m_width, m_height); i++)

      m_data[i] ^= 255;

    break;

  }

}

void display_t::drawRectangle(int16_t x1, int16_t y1, int16_t x2, int16_t y2,

                              colour_t color)

{

  for (int16_t x = x1; x <= x2; x++)

    for (int16_t y = y1; y < y2; y++)

    {

      switch (color)

      {

      case BLACK:

        m_data[x + (y / 8) * m_width] &= ~(1 << (y & 7));

        break;

      default:

      case WHITE:

      case OVERLAY:

        m_data[x + (y / 8) * m_width] |= (1 << (y & 7));

        break;

      case INVERT:

        m_data[x + (y / 8) * m_width] ^= (1 << (y & 7));

        break;

      }

    }

}

/* using Bresenham draw algorithm */

void display_t::drawLine(int16_t x1, int16_t y1, int16_t x2, int16_t y2,

                         colour_t colour, int8_t pattern)

{

  int16_t x, y, dx, dy,  // deltas

      dx2, dy2,          // scaled deltas

      ix, iy,            // increase rate on the x and y axis

      err;               // the error term

  int8_t patt = pattern; // drawing pattern bit mask 1= solid 10= dots , 111000 equal dot/dash

  uint16_t i; // looping variable

  setPixelMode(colour);

  // identify the first pixel

  x = x1;

  y = y1;

  // difference between starting and ending points

  dx = x2 - x1;

  dy = y2 - y1;

  // calculate direction of the vector and store in ix and iy

  if (dx >= 0)

    ix = 1;

  if (dx < 0)

  {

    ix = -1;

    dx = abs(dx);

  }

  if (dy >= 0)

    iy = 1;

  if (dy < 0)

  {

    iy = -1;

    dy = abs(dy);

  }

  // scale deltas and store in dx2 and dy2

  dx2 = dx * 2;

  dy2 = dy * 2;

  // all  variables are set and it's time to enter the main loop.

  if (dx > dy) // dx is the major axis

  {

    // initialize the error term

    err = dy2 - dx;

    for (i = 0; i <= dx; i++)

    {

      // draw pattern based on using pattern as a sequential bit mask.

      if (patt & 1)

        drawPixel(x, y, 1);

      patt = (patt <= 1) ? pattern : patt >> 1;

      if (err >= 0)

      {

        err -= dx2;

        y += iy;

      }

      err += dy2;

      x += ix;

    }

  }

  else // dy is the major axis

  {

    // initialize the error term

    err = dx2 - dy;

    for (i = 0; i <= dy; i++)

    {

      // draw pattern based on using pattern as a sequential bit mask.

      if (patt & 1)

        drawPixel(x, y, 1);

      patt = (patt <= 1) ? pattern : patt >> 1;

      if (err >= 0)

      {

        err -= dy2;

        x += ix;

      }

      err += dx2;

      y += iy;

    }

  }

}