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_data (data)

{

}

display_t::~display_t()

{

}

void

display_t::display_t::init ()

{

  uint8_t const vccstate = SSD1306_EXTERNALVCC;

  oledReset ();

  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, colour_t color)

{

  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

  switch (color)

    {

    case BLACK:

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

      break;

    default:

    case WHITE:

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

      break;

    case INVERT:

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

      break;

    }

}

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 (void)

{

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

}

/* using Bresenham draw algorithm */

void

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

                     colour_t color)

{

  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

  uint16_t i;           //looping variable

  // 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++)

        {

          drawPixel (x, y, color);

          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++)

        {

          drawPixel (x, y, color);

          if (err >= 0)

            {

              err -= dy2;

              x += ix;

            }

          err += dx2;

          y += iy;

        }

    }

}