eboled: Sparkfun OLED Block Improvements

Signed-off-by: Tyler Gibson <tgibson@microsoft.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

examples/javascript/eboled.js

@@ -5,6 +5,9 @@
  * Author: Jon Trulson <jtrulson@ics.com>
  * Copyright (c) 2015 Intel Corporation.
  *
+ * Author: Tyler Gibson <tgibson@microsoft.com>
+ * Copyright (c) 2015 Microsoft Corporation.
+ *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
@@ -25,27 +28,123 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-function exit()
-{
-    lcd = null;
-    lcdObj.cleanUp();
-    lcdObj = null;
-    process.exit(0);
-}
-
-// Load i2clcd module
 var lcdObj = require('jsupm_i2clcd');
+var oled = new lcdObj.EBOLED();
 
-var lcd = new lcdObj.EBOLED();
-
-lcd.clear();
-lcd.setCursor(2, 0);
-lcd.write("Hello");
-lcd.setCursor(3, 5);
-lcd.write("World!");
-
-console.log("Sleeping for 5 seconds...");
-setTimeout(exit, 5000);
+var sample = 0;
+var samples = 13;
 
+function exit()
+{
+  oled = null;
+  lcdObj.cleanUp();
+  lcdObj = null;
+  process.exit(0);
+}
 
+setInterval( function()
+{
+  if(sample>samples)
+  {
+    exit();
+  }
+  oled.clearScreenBuffer();
+  runSample(sample++);
+  oled.refresh();
+}, 1500);
 
+function runSample(sample)
+{
+  switch(sample) {
+    case 0:
+      // x/y coords are 0 based, using 1 here for padding.
+      oled.setCursor(1,1);
+      // nowrap = 0, wrapping = 1
+      oled.setTextWrap(1);
+      oled.write("HELLO WORLD! Mixed with #123 and y's, g's and q's.");
+      break;
+    case 1:
+      oled.setCursor(12, 1);
+      //multiply text size, only integers
+      oled.setTextSize(3);
+      oled.write("BOO!");
+      oled.setTextSize(1);
+      break;
+    case 2:
+      oled.drawRectangleFilled(0,0,48,9);
+      oled.setCursor(1,1);
+      // 0=Black, 1=White, 2=Xor (Toggle)
+      oled.setTextColor(2);
+      oled.write("Cutout");
+      break;
+    case 3:
+      var total = Math.random()*100;
+      for(var stars=0; stars<total; stars++ )
+        oled.drawPixel(Math.floor(Math.random()*63), Math.floor(Math.random()*47), 1);
+      break;
+    case 4:
+      for(var burst=0; burst<12; burst++)
+        oled.drawLine(31, 24, Math.floor(Math.random()*63), Math.floor(Math.random()*47), 1);
+      break;
+    case 5:
+      var lastPeak = 24;
+      for(var peak=0; peak < 64; peak++)
+      {
+        var thisPeak = Math.abs(lastPeak + Math.floor(Math.random()*(-6) + Math.random()*6));
+        oled.drawLine(peak, thisPeak, peak, 47, 1);
+        lastPeak = thisPeak;
+      }
+      break;
+    case 6:
+      for(var y=0; y<47; y++)
+      {
+        oled.drawLineHorizontal(0,y+1,63,2);
+        oled.refresh();
+        oled.drawLineHorizontal(0,y,63,2);
+      }
+      break;
+    case 7:
+      var eqbarHeights = [ Math.floor(Math.random()*32),
+                           Math.floor(Math.random()*32),
+                           Math.floor(Math.random()*32),
+                           Math.floor(Math.random()*32),
+                           Math.floor(Math.random()*32),
+                           Math.floor(Math.random()*32),
+                           Math.floor(Math.random()*32) ];
+      var begin = Date.now();
+      while(Date.now()-begin < 2000)
+      {
+        oled.clearScreenBuffer();
+        for(var eqbar=0; eqbar<7; eqbar++)
+        {
+          oled.drawRectangleFilled(eqbar*9, 49 - eqbarHeights[eqbar], 8, eqbarHeights[eqbar], 1);
+          eqbarHeights[eqbar] = eqbarHeights[eqbar] + Math.random()*(-2) + Math.random()*2;
+          if(eqbarHeights[eqbar]<0)
+            eqbarHeights[eqbar] = 1;
+        }
+        oled.refresh();
+      }
+      oled.clear();
+      break;
+    case 8:
+      oled.drawRoundedRectangle(8, 8, 48, 16, 4, 1);
+      oled.setCursor(12, 16);
+      oled.write("Cancel");
+      break;
+    case 9:
+      oled.drawTriangle(2, 2, 52, 7, 17, 37, 1);
+      break;
+    case 10:
+      oled.drawTriangleFilled(2, 2, 52, 7, 17, 37, 1);
+      break;
+    case 11:
+      oled.drawCircle(32, 24, 14, 1);
+      break;
+    case 12:
+      oled.drawCircleFilled(32, 24, 14, 1);
+      break;
+    case 13:
+      oled.fillScreen(1);
+      break;
+  }
+}

src/lcd/eboled.cxx

@@ -2,6 +2,9 @@
  * Author: Jon Trulson <jtrulson@ics.com>
  * Copyright (c) 2015 Intel Corporation.
  *
+ * Author: Tyler Gibson <tgibson@microsoft.com>
+ * Copyright (c) 2015 Microsoft Corporation.
+ *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
@@ -29,15 +32,23 @@
 using namespace upm;
 using namespace std;
 
-EBOLED::EBOLED(int spi, int CD, int reset) : 
+static uint16_t screenBuffer[BUFFER_SIZE];
+
+EBOLED::EBOLED(int spi, int CD, int reset) :
   m_spi(spi), m_gpioCD(CD), m_gpioRST(reset)
 {
   m_name = "EBOLED";
-  
+  m_textColor = COLOR_WHITE;
+  m_textWrap = 0;
+  m_textSize = 1;
+  m_cursorX = 0;
+  m_cursorY = 0;
+
   m_gpioCD.dir(mraa::DIR_OUT);
   m_gpioRST.dir(mraa::DIR_OUT);
 
-  m_spi.frequency(1000000);
+  //1000000 is standard.
+  m_spi.frequency(10000000);
 
   // reset the device
   m_gpioRST.write(1);
@@ -53,40 +64,48 @@ EBOLED::EBOLED(int spi, int CD, int reset) :
 
   command(CMD_SETMULTIPLEX);
   command(0x2f);
-  
+
   command(CMD_SETDISPLAYOFFSET);
   command(0x0);                 // no offset
-  
+
   command(CMD_SETSTARTLINE | 0x0); // line #0
-  
+
   command(CMD_CHARGEPUMP);      // enable charge pump
   command(0x14);
-  
+
   command(CMD_NORMALDISPLAY);
   command(CMD_DISPLAYALLONRESUME);
-  
+
   command(CMD_SEGREMAP | 0x1);  // reverse mapping (SEG0==COL127)
   command(CMD_COMSCANDEC);
-  
+
   command(CMD_SETCOMPINS);      // custom COM PIN mapping
   command(0x12);
-  
+
   command(CMD_SETCONTRAST);
   command(0x8f);
-  
+
   command(CMD_SETPRECHARGE);
   command(0xf1);
-  
+
   command(CMD_SETVCOMDESELECT);
   command(0x40);
-  
+
   command(CMD_DISPLAYON);
-  
 
   usleep(4500);
-  
-  clear();
-  setAddressingMode(PAGE);
+
+  setAddressingMode(HORIZONTAL);
+
+  //Set Page Address range, required for horizontal addressing mode.
+  command(CMD_SETPAGEADDRESS); // triple-byte cmd
+  command(0x00); //Initial page address
+  command(0x05); //Final page address
+
+  //Set Column Address range, required for horizontal addressing mode.
+  command(CMD_SETCOLUMNADDRESS); // triple-byte cmd
+  command(0x20); // this display has a horizontal offset of 20 columns
+  command(0x5f); // 64 columns wide - 0 based 63 offset
 }
 
 EBOLED::~EBOLED()
@@ -94,68 +113,117 @@ EBOLED::~EBOLED()
   clear();
 }
 
-mraa::Result EBOLED::draw(uint8_t* bdata, int bytes)
+mraa::Result EBOLED::refresh()
 {
-  mraa::Result error = mraa::SUCCESS;
-
-  setAddressingMode(HORIZONTAL);
-
-  command(CMD_SETCOLUMNADDRESS); // triple-byte cmd
-  command(0x20); // this display has a horizontal offset of 20 columns
-  command(0x20 + 0x40); // 64 columns wide
+  mraa::Result error = mraa::SUCCESS;;
 
-  for (int idx = 0; idx < bytes; idx++)
-    error = data(bdata[idx]);
-
-  // reset addressing mode
-  setAddressingMode(PAGE);
+  m_gpioCD.write(1);            // data mode
+  for(int i=0; i<BUFFER_SIZE; i++)
+  {
+    error = data(screenBuffer[i]);
+    if(error != MRAA_SUCCESS)
+      return error;
+  }
 
   return error;
 }
 
-mraa::Result EBOLED::write(std::string msg)
+mraa::Result EBOLED::write (std::string msg)
 {
-  mraa::Result error = mraa::SUCCESS;
+  int len = msg.length();
+  uint8_t temp_cursorX = m_cursorX;
+  for (int idx = 0; idx < len; idx++)
+  {
+    if (msg[idx] == '\n')
+    {
+      m_cursorY += m_textSize * 9;
+      temp_cursorX = m_cursorX;
+    }
+    else if (msg[idx] == '\r')
+    {
+      // skip em
+    }
+    else
+    {
+      drawChar(temp_cursorX, m_cursorY, msg[idx], m_textColor, m_textSize);
+      temp_cursorX += m_textSize * 6;
+
+      //textColor used to avoid wrapping if COLOR_BLACK is set.
+      if (m_textWrap && (m_textColor > OLED_WIDTH - temp_cursorX - 6))
+      {
+        m_cursorY += m_textSize * 9;
+        temp_cursorX = m_cursorX;
+      }
+    }
+  }
+  return mraa::SUCCESS;;
+}
 
-  setAddressingMode(PAGE);
-  for (std::string::size_type i = 0; i < msg.size(); ++i)
-    error = writeChar(msg[i]);
+mraa::Result EBOLED::setCursor (int row, int column) {
+  m_cursorX = column;
+  m_cursorY = row;
+  return mraa::SUCCESS;;
+}
 
-  return error;
+void EBOLED::setTextColor (uint8_t textColor) {
+  m_textColor   = textColor;
 }
 
-mraa::Result EBOLED::setCursor(int row, int column)
-{
-  mraa::Result error = mraa::SUCCESS;
+void EBOLED::setTextSize (uint8_t size) {
+  m_textSize = (size > 0) ? size : 1;
+}
 
-  // set page address
-  error = command(CMD_SETPAGESTARTADDR | (row & 0x07));
+void EBOLED::setTextWrap (uint8_t wrap) {
+  m_textWrap = wrap;
+}
 
-  // set column address
-  error = command(CMD_SETLOWCOLUMN | (column & 0x0f));
-  // ediblock oled starts at col 20 apparently...
-  error = command(CMD_SETHIGHCOLUMN | ((column >> 4) & 0x0f) + 0x02);
+void EBOLED::drawChar (uint8_t x, uint8_t y, uint8_t data, uint8_t color, uint8_t size) {
+  if( (x >= OLED_WIDTH)            || // Clip right
+      (y >= OLED_HEIGHT)           || // Clip bottom
+      ((x + 6 * size - 1) < 0)  || // Clip left
+      ((y + 8 * size - 1) < 0))    // Clip top
+  return;
 
-  return error;
+  if (data < 0x20 || data > 0x7F) {
+    data = 0x20; // space
+  }
+
+  for (int8_t i=0; i<6; i++ ) {
+    uint8_t line;
+    if (i == 6)
+      line = 0x0;
+    else
+    {
+      //32 offset to align standard ASCII range to index
+      line = BasicFont[data - 32][i+1];
+      for (int8_t j = 0; j<8; j++)
+      {
+        if (line & 0x1)
+        {
+          if (size == 1) // default size
+            drawPixel(x+i, y+j, color);
+          else
+            drawRectangleFilled(x+(i*size), y+(j*size), size, size, color); // big size
+        }
+        line >>= 1;
+      }
+    }
+  }
 }
 
 mraa::Result EBOLED::clear()
 {
-  mraa::Result error = mraa::SUCCESS;
-  uint8_t columnIdx, rowIdx;
-  
-  for (rowIdx = 0; rowIdx < 8; rowIdx++)
-    {
-      setCursor(rowIdx, 0);
-      
-      // clear all columns (8 * 8 pixels per char)
-      for (columnIdx = 0; columnIdx < 8; columnIdx++)
-        error = writeChar(' ');
-    }
-  
-  home();
-  
-  return mraa::SUCCESS;
+  mraa::Result error = mraa::SUCCESS;;
+
+  m_gpioCD.write(1);            // data mode
+  for(int i=0; i<BUFFER_SIZE; i++)
+  {
+    error = data(0x0000);
+    if(error != MRAA_SUCCESS)
+      return error;
+  }
+
+  return mraa::SUCCESS;;
 }
 
 mraa::Result EBOLED::home()
@@ -163,19 +231,310 @@ mraa::Result EBOLED::home()
   return setCursor(0, 0);
 }
 
-mraa::Result EBOLED::writeChar(uint8_t value)
+void EBOLED::drawPixel(int8_t x, int8_t y, uint8_t color)
 {
-  mraa::Result rv;
+  if(x<0 || x>=OLED_WIDTH || y<0 || y>=OLED_HEIGHT)
+    return;
+
+  /* Screenbuffer is uint16 array, but pages are 8bit high so each buffer
+   * index is two columns.  This means the index is based on x/2 and
+   * OLED_WIDTH/2 = VERT_COLUMNS.
+   *
+   * Then to set the appropriate bit, we need to shift based on the y
+   * offset in relation to the page and then adjust for high/low based
+   * on the x position.
+  */
+
+  switch(color)
+  {
+    case COLOR_XOR:
+      screenBuffer[(x/2) + ((y/8) * VERT_COLUMNS)] ^= (1<<(y%8+(x%2 * 8)));
+      return;
+    case COLOR_WHITE:
+      screenBuffer[(x/2) + ((y/8) * VERT_COLUMNS)] |= (1<<(y%8+(x%2 * 8)));
+      return;
+    case COLOR_BLACK:
+      screenBuffer[(x/2) + ((y/8) * VERT_COLUMNS)] &= ~(1<<(y%8+(x%2 * 8)));
+      return;
+  }
+}
+
+void EBOLED::drawLine(int8_t x0, int8_t y0, int8_t x1, int8_t y1, uint8_t color)
+{
+  int16_t steep = abs(y1 - y0) > abs(x1 - x0);
 
-  if (value < 0x20 || value > 0x7F) {
-    value = 0x20; // space
+  if (steep) {
+    swap(x0, y0);
+    swap(x1, y1);
   }
 
-  for (uint8_t idx = 0; idx < 8; idx++) {
-    rv = data(BasicFont[value - 32][idx]);
+  if (x0 > x1) {
+    swap(x0, x1);
+    swap(y0, y1);
   }
 
-  return rv;
+  int16_t dx, dy;
+  dx = x1 - x0;
+  dy = abs (y1 - y0);
+
+  int16_t err = dx / 2;
+  int16_t ystep;
+
+  if (y0 < y1) {
+    ystep = 1;
+  } else {
+    ystep = -1;
+  }
+
+  for (; x0 <= x1; x0++) {
+    if (steep) {
+      drawPixel(y0, x0, color);
+    } else {
+      drawPixel(x0, y0, color);
+    }
+    err -= dy;
+    if (err < 0) {
+      y0 += ystep;
+      err += dx;
+    }
+  }
+}
+
+void EBOLED::drawLineHorizontal(int8_t x, int8_t y, uint8_t width, uint8_t color)
+{
+  drawLine(x, y, x+width-1, y, color);
+}
+
+void EBOLED::drawLineVertical(int8_t x, int8_t y, uint8_t height, uint8_t color)
+{
+  drawLine(x, y, x, y+height-1, color);
+}
+
+void EBOLED::drawRectangle(int8_t x, int8_t y, uint8_t width, uint8_t height, uint8_t color)
+{
+  drawLineHorizontal(x, y, width, color);
+  drawLineHorizontal(x, y+height-1, color);
+
+  uint8_t innerHeight = height - 2;
+  if(innerHeight > 0)
+  {
+    drawLineVertical(x, y+1, innerHeight, color);
+    drawLineVertical(x+width-1, y+1, innerHeight, color);
+  }
+}
+
+void EBOLED::drawRoundedRectangle(int8_t x, int8_t y, int8_t width, int8_t height, int16_t radius, uint8_t color) {
+  // smarter version
+  drawLineHorizontal(x+radius  , y         , width-2*radius,  color); // Top
+  drawLineHorizontal(x+radius  , y+height-1, width-2*radius,  color); // Bottom
+  drawLineVertical(  x         , y+radius  , height-2*radius, color); // Left
+  drawLineVertical(  x+width-1 , y+radius  , height-2*radius, color); // Right
+  // draw four corners
+  drawRoundCorners(x+radius        , y+radius         , radius, 1, color);
+  drawRoundCorners(x+width-radius-1, y+radius         , radius, 2, color);
+  drawRoundCorners(x+width-radius-1, y+height-radius-1, radius, 4, color);
+  drawRoundCorners(x+radius        , y+height-radius-1, radius, 8, color);
+}
+
+void EBOLED::drawRectangleFilled(int8_t x, int8_t y, uint8_t width, uint8_t height, uint8_t color)
+{
+  for (uint8_t i=x; i<x+width; i++) {
+    drawLineVertical(i, y, height, color);
+  }
+}
+
+void EBOLED::drawTriangle(int8_t x0, int8_t y0, int8_t x1, int8_t y1, int8_t x2, int8_t y2, uint8_t color)
+{
+  drawLine(x0, y0, x1, y1, color);
+  drawLine(x1, y1, x2, y2, color);
+  drawLine(x2, y2, x0, y0, color);
+}
+
+void EBOLED::drawTriangleFilled ( int8_t x0, int8_t y0, int8_t x1, int8_t y1, int8_t x2, int8_t y2, uint8_t color) {
+
+  int16_t a, b, y, last;
+
+  // Sort coordinates by Y order (y2 >= y1 >= y0)
+  if (y0 > y1) {
+    swap(y0, y1); swap(x0, x1);
+  }
+  if (y1 > y2) {
+    swap(y2, y1); swap(x2, x1);
+  }
+  if (y0 > y1) {
+    swap(y0, y1); swap(x0, x1);
+  }
+
+  if(y0 == y2) { // Handle awkward all-on-same-line case as its own thing
+    a = b = x0;
+    if(x1 < a)      a = x1;
+    else if(x1 > b) b = x1;
+    if(x2 < a)      a = x2;
+    else if(x2 > b) b = x2;
+    drawLineHorizontal(a, y0, b-a+1, color);
+    return;
+  }
+
+  int16_t
+    dx01 = x1 - x0,
+    dy01 = y1 - y0,
+    dx02 = x2 - x0,
+    dy02 = y2 - y0,
+    dx12 = x2 - x1,
+    dy12 = y2 - y1;
+  int32_t
+    sa   = 0,
+    sb   = 0;
+
+  // For upper part of triangle, find scanline crossings for segments
+  // 0-1 and 0-2.  If y1=y2 (flat-bottomed triangle), the scanline y1
+  // is included here (and second loop will be skipped, avoiding a /0
+  // error there), otherwise scanline y1 is skipped here and handled
+  // in the second loop...which also avoids a /0 error here if y0=y1
+  // (flat-topped triangle).
+  if(y1 == y2) last = y1;   // Include y1 scanline
+  else         last = y1-1; // Skip it
+
+  for(y=y0; y<=last; y++) {
+    a   = x0 + sa / dy01;
+    b   = x0 + sb / dy02;
+    sa += dx01;
+    sb += dx02;
+    /* longhand:
+    a = x0 + (x1 - x0) * (y - y0) / (y1 - y0);
+    b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
+    */
+    if(a > b) swap(a,b);
+    drawLineHorizontal(a, y, b-a+1, color);
+  }
+
+  // For lower part of triangle, find scanline crossings for segments
+  // 0-2 and 1-2.  This loop is skipped if y1=y2.
+  sa = dx12 * (y - y1);
+  sb = dx02 * (y - y0);
+  for(; y<=y2; y++) {
+    a   = x1 + sa / dy12;
+    b   = x0 + sb / dy02;
+    sa += dx12;
+    sb += dx02;
+    /* longhand:
+    a = x1 + (x2 - x1) * (y - y1) / (y2 - y1);
+    b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
+    */
+    if(a > b) swap(a,b);
+    drawLineHorizontal(a, y, b-a+1, color);
+  }
+}
+
+void EBOLED::drawCircle(int16_t x0, int16_t y0, int16_t radius, uint8_t color)
+{
+  int16_t f = 1 - radius;
+  int16_t ddF_x = 1;
+  int16_t ddF_y = -2 * radius;
+  int16_t x = 0;
+  int16_t y = radius;
+
+  drawPixel(x0  , y0+radius, color);
+  drawPixel(x0  , y0-radius, color);
+  drawPixel(x0+radius, y0  , color);
+  drawPixel(x0-radius, y0  , color);
+
+  while (x<y)
+  {
+    if (f >= 0)
+    {
+      y--;
+      ddF_y += 2;
+      f += ddF_y;
+    }
+    x++;
+
+    ddF_x += 2;
+    f += ddF_x;
+
+    drawPixel(x0 + x, y0 + y, color);
+    drawPixel(x0 - x, y0 + y, color);
+    drawPixel(x0 + x, y0 - y, color);
+    drawPixel(x0 - x, y0 - y, color);
+    drawPixel(x0 + y, y0 + x, color);
+    drawPixel(x0 - y, y0 + x, color);
+    drawPixel(x0 + y, y0 - x, color);
+    drawPixel(x0 - y, y0 - x, color);
+  }
+}
+
+void EBOLED::drawRoundCorners( int8_t x0, int8_t y0, int16_t radius, uint8_t cornername, uint8_t color) {
+  int16_t f     = 1 - radius;
+  int16_t ddF_x = 1;
+  int16_t ddF_y = -2 * radius;
+  int16_t x     = 0;
+  int16_t y     = radius;
+
+  while (x<y) {
+    if (f >= 0) {
+      y--;
+      ddF_y += 2;
+      f     += ddF_y;
+    }
+    x++;
+    ddF_x += 2;
+    f     += ddF_x;
+    if (cornername & 0x4) {
+      drawPixel(x0 + x, y0 + y, color);
+      drawPixel(x0 + y, y0 + x, color);
+    }
+    if (cornername & 0x2) {
+      drawPixel(x0 + x, y0 - y, color);
+      drawPixel(x0 + y, y0 - x, color);
+    }
+    if (cornername & 0x8) {
+      drawPixel(x0 - y, y0 + x, color);
+      drawPixel(x0 - x, y0 + y, color);
+    }
+    if (cornername & 0x1) {
+      drawPixel(x0 - y, y0 - x, color);
+      drawPixel(x0 - x, y0 - y, color);
+    }
+  }
+}
+
+void EBOLED::drawCircleFilled(int8_t x0, int8_t y0, int16_t radius, uint8_t color) {
+  drawLineVertical(x0, y0-radius, 2*radius+1, color);
+  drawRoundedCornersFilled(x0, y0, radius, 3, 0, color);
+}
+
+void EBOLED::drawRoundedCornersFilled(int8_t x0, int8_t y0, int16_t radius, uint8_t cornername, int16_t delta, uint8_t color) {
+
+  int16_t f     = 1 - radius;
+  int16_t ddF_x = 1;
+  int16_t ddF_y = -2 * radius;
+  int16_t x     = 0;
+  int16_t y     = radius;
+
+  while (x<y) {
+    if (f >= 0) {
+      y--;
+      ddF_y += 2;
+      f     += ddF_y;
+    }
+    x++;
+    ddF_x += 2;
+    f     += ddF_x;
+
+    if (cornername & 0x1) {
+      drawLineVertical(x0+x, y0-y, 2*y+1+delta, color);
+      drawLineVertical(x0+y, y0-x, 2*x+1+delta, color);
+    }
+    if (cornername & 0x2) {
+      drawLineVertical(x0-x, y0-y, 2*y+1+delta, color);
+      drawLineVertical(x0-y, y0-x, 2*x+1+delta, color);
+    }
+  }
+}
+
+void EBOLED::fillScreen(uint8_t color)
+{
+  drawRectangleFilled(0, 0, OLED_WIDTH-1, OLED_HEIGHT-1, color);
 }
 
 mraa::Result EBOLED::setAddressingMode(displayAddressingMode mode)
@@ -195,9 +554,14 @@ mraa::Result EBOLED::command(uint8_t cmd)
   return mraa::SUCCESS;
 }
 
-mraa::Result EBOLED::data(uint8_t data)
+mraa::Result EBOLED::data(uint16_t data)
 {
-  m_gpioCD.write(1);            // data mode
-  m_spi.writeByte(data);
+  m_spi.write_word(data);
   return mraa::SUCCESS;
 }
+
+void EBOLED::clearScreenBuffer()
+{
+  for(int i=0; i<BUFFER_SIZE;i++)
+    screenBuffer[i] = 0x0000;
+}

src/lcd/eboled.h

@@ -2,6 +2,12 @@
  * Author: Jon Trulson <jtrulson@ics.com>
  * Copyright (c) 2015 Intel Corporation.
  *
+ * Author: Tyler Gibson <tgibson@microsoft.com>
+ * Copyright (c) 2015 Microsoft Corporation.
+ *
+ * Credits to Adafruit.
+ * Based on Adafruit ST7735 library, see original license in license.txt file.
+ *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
@@ -35,6 +41,8 @@
 #define EBOLED_DEFAULT_CD      36
 #define EBOLED_DEFAULT_RESET   48
 
+#define swap(a, b) { uint8_t t = a; a = b; b = t; }
+
 namespace upm
 {
   /**
@@ -60,6 +68,15 @@ namespace upm
    *
    * @snippet eboled.cxx Interesting
    */
+
+  const uint8_t COLOR_WHITE     = 0x01;
+  const uint8_t COLOR_BLACK     = 0x00;
+  const uint8_t COLOR_XOR       = 0x02;
+  const uint8_t OLED_WIDTH      = 0x40; // 64 pixels
+  const uint8_t VERT_COLUMNS    = 0x20; // half width for hi/lo 16bit writes.
+  const uint8_t OLED_HEIGHT     = 0x30; // 48 pixels
+  const int     BUFFER_SIZE     = 192;
+
   class EBOLED : public LCD
   {
     // SSD commands
@@ -73,7 +90,7 @@ namespace upm
       CMD_SETPAGEADDRESS        = 0x22,
       CMD_SETSTARTLINE          = 0x40, // 0x40 - 0x7f
       CMD_SETCONTRAST           = 0x81,
-      CMD_CHARGEPUMP            = 0x8d, 
+      CMD_CHARGEPUMP            = 0x8d,
       CMD_SEGREMAP              = 0xa0,
       CMD_DISPLAYALLONRESUME    = 0xa4,
       CMD_DISPLAYALLON          = 0xa5,
@@ -102,28 +119,28 @@ namespace upm
      * @param reset reset pin
      * @param address the slave address the lcd is registered on
      */
-    EBOLED(int spi=EBOLED_DEFAULT_SPI_BUS, int CD=EBOLED_DEFAULT_CD, 
+    EBOLED(int spi=EBOLED_DEFAULT_SPI_BUS, int CD=EBOLED_DEFAULT_CD,
            int reset=EBOLED_DEFAULT_RESET);
-    
+
     /**
      * EBOLED Destructor
      */
     ~EBOLED();
 
     /**
-     * Draw an image, see examples/python/make_oled_pic.py for an
-     * explanation on how the pixels are mapped to bytes
+     * Draw the buffer to screen, see examples/python/make_oled_pic.py for an
+     * explanation on how the pixels are mapped to bytes.
      *
      * @param data the buffer to write
      * @param bytes the number of bytes to write
      * @return result of operation
      */
-    mraa::Result draw(uint8_t* data, int bytes);
+    mraa::Result refresh();
 
     /**
      * Write a string to LCD
      *
-     * @param msg the std::string to write to display, note only ascii 
+     * @param msg the std::string to write to display, note only ascii
      * chars are supported
      * @return result of operation
      */
@@ -132,12 +149,45 @@ namespace upm
     /**
      * Set cursor to a coordinate
      *
-     * @param row the row to set cursor to.  This device supports 6 rows.
-     * @param column the column to set cursor to. This device support
-     * 64 columns
+     * @param y Axis on the vertical scale. This device supports 6 rows.
+     * @param x Axis on the horizontal scale This device supports 64 columns
+     *
      * @return result of operation
      */
-    mraa::Result setCursor(int row, int column);
+    mraa::Result setCursor (int row, int column);
+
+    /**
+      * Sets a text color for a message
+      *
+      * @param textColor Font color: COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+      */
+    void setTextColor (uint8_t textColor);
+
+    /**
+      * Sets the size of the font
+      *
+      * @param size Font size
+      */
+    void setTextSize (uint8_t size);
+
+    /**
+      * Wraps a printed message
+      *
+      * @param wrap True (1) or false (0)
+      */
+    void setTextWrap (uint8_t wrap);
+
+    /**
+      * Write a single character to the screen.
+      *
+      * @param x Axis on the horizontal scale
+      * @param y Axis on the vertical scale
+      * @param data Character to write
+      * @param color Character color
+      * @param bg Character background color
+      * @param size Size of the font
+      */
+    void drawChar (uint8_t x, uint8_t y, uint8_t data, uint8_t color, uint8_t size);
 
     /**
      * Clear display
@@ -146,6 +196,8 @@ namespace upm
      */
     mraa::Result clear();
 
+    void clearScreenBuffer();
+
     /**
      * Return to coordinate 0,0
      *
@@ -153,9 +205,160 @@ namespace upm
      */
     mraa::Result home();
 
+    /**
+     * Write a single pixel to the screen buffer.
+     * Can do an specific color write or toggle (xor) a pixel.
+     *
+     * @param x the x position of the pixel
+     * @param y the y position of the pixel
+     * @param color pixel is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawPixel (int8_t x, int8_t y, uint8_t color=COLOR_WHITE);
+
+    /**
+     * Draw a line to the screen buffer.
+     *
+     * @param x0 the x position of the beginning of the line
+     * @param y0 the y position of the beginning of the line
+     * @param x1 the x position of the end of the line
+     * @param y1 the y position of the end of the line
+     * @param color line is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawLine (int8_t x0, int8_t y0, int8_t x1, int8_t y1, uint8_t color = COLOR_WHITE);
+
+    /**
+     * Draw a horizontal line to the screen buffer.
+     *
+     * @param x the x position of the beginning of the line
+     * @param y the y position of the beginning of the line
+     * @param width is the horizontal length of the line
+     * @param color line is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawLineHorizontal (int8_t x, int8_t y, uint8_t width, uint8_t color = COLOR_WHITE);
+
+    /**
+     * Draw a vertical line to the screen buffer.
+     *
+     * @param x the x position of the beginning of the line
+     * @param y the y position of the beginning of the line
+     * @param width is the vertical length of the line
+     * @param color line is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawLineVertical (int8_t x, int8_t y, uint8_t height, uint8_t color = COLOR_WHITE);
+
+    /**
+     * Draw a rectangle to the screen buffer.
+     *
+     * @param x the left edge
+     * @param y the top edge
+     * @param width sets the right edge
+     * @param height bottom edge
+     * @param color outline is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawRectangle (int8_t x, int8_t y, uint8_t width, uint8_t height, uint8_t color = COLOR_WHITE);
+
+    /**
+     * Draw a rectangle with rounded corners to the screen buffer.
+     *
+     * @param x the left edge
+     * @param y the top edge
+     * @param width sets the right edge
+     * @param height bottom edge
+     * @param radius of the rounded corners
+     * @param color outline is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawRoundedRectangle(int8_t x, int8_t y, int8_t width, int8_t height, int16_t radius, uint8_t color);
+
+    /**
+     * Draw a filled rectangle to the screen buffer.
+     *
+     * @param x the left edge
+     * @param y the top edge
+     * @param width sets the right edge
+     * @param height bottom edge
+     * @param color fill color is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawRectangleFilled (int8_t x, int8_t y, uint8_t width, uint8_t height, uint8_t color = COLOR_WHITE);
+
+    /**
+     * Draw a triangle to the screen buffer.
+     *
+     * @param x0 the x coordinate of the first corner
+     * @param y0 the y coordinate of the first corner
+     * @param x1 the x coordinate of the second corner
+     * @param y1 the y coordinate of the second corner
+     * @param x2 the x coordinate of the third corner
+     * @param y2 the y coordinate of the third corner
+     * @param color outline is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawTriangle (int8_t x0, int8_t y0, int8_t x1, int8_t y1, int8_t x2, int8_t y2, uint8_t color = COLOR_WHITE);
+
+    /**
+     * Draw a filled triangle to the screen buffer.
+     *
+     * @param x0 the x coordinate of the first corner
+     * @param y0 the y coordinate of the first corner
+     * @param x1 the x coordinate of the second corner
+     * @param y1 the y coordinate of the second corner
+     * @param x2 the x coordinate of the third corner
+     * @param y2 the y coordinate of the third corner
+     * @param color fill color is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawTriangleFilled ( int8_t x0, int8_t y0, int8_t x1, int8_t y1, int8_t x2, int8_t y2, uint8_t color);
+
+    /**
+     * Draw a circle to the screen buffer.
+     *
+     * @param x0 the x coordinate of the circle's center
+     * @param y0 the y coordinate of the circle's center
+     * @param radius the radius of the circle
+     * @param color outline is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawCircle (int16_t x0, int16_t y0, int16_t radius, uint8_t color = COLOR_WHITE);
+
+    /**
+     * Draw a quarter circle arc to the screen buffer.
+     *
+     * @param x0 the x coordinate of the arc's center
+     * @param y0 the y coordinate of the arc's center
+     * @param radius the radius of the arc
+     * @param cornername denotes which of the 4 quarters to draw - 1,2,4,8
+     * @param color outline is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawRoundCorners( int8_t x0, int8_t y0, int16_t radius, uint8_t cornername, uint8_t color);
+
+    /**
+     * Draw a filled circle to the screen buffer.
+     *
+     * @param x0 the x coordinate of the circle's center
+     * @param y0 the y coordinate of the circle's center
+     * @param radius the radius of the circle
+     * @param color outline is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawCircleFilled(int8_t x0, int8_t y0, int16_t radius, uint8_t color);
+
+    /**
+     * Draw a quarter pie to the screen buffer.
+     *
+     * @param x0 the x coordinate of the arc's center
+     * @param y0 the y coordinate of the arc's center
+     * @param radius the radius of the arc
+     * @param cornername denotes which of the 4 quarters to draw - 1,2,4,8
+     * @param color fill color is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void drawRoundedCornersFilled(int8_t x0, int8_t y0, int16_t radius, uint8_t cornername, int16_t delta, uint8_t color);
+
+    /**
+     * Fill the screen buffer with specified color.
+     *
+     * @param color fill color is COLOR_WHITE, COLOR_BLACK or COLOR_XOR
+     */
+    void fillScreen (uint8_t color=COLOR_WHITE);
+
+
   protected:
     mraa::Result command(uint8_t cmd);
-    mraa::Result data(uint8_t data);
+    mraa::Result data(uint16_t data);
     mraa::Result writeChar(uint8_t value);
     mraa::Result setAddressingMode(displayAddressingMode mode);
 
@@ -164,5 +367,11 @@ namespace upm
     mraa::Gpio m_gpioRST;       // reset pin
 
     mraa::Spi m_spi;
+
+    uint8_t m_cursorX;
+    uint8_t m_cursorY;
+    uint8_t m_textSize;
+    uint8_t m_textColor;
+    uint8_t m_textWrap;
   };
 }

src/lcd/license.txt

@@ -0,0 +1,24 @@
+Software License Agreement (BSD License)
+
+Copyright (c) 2012 Adafruit Industries.  All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+- Redistributions of source code must retain the above copyright notice,
+  this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.