Théo Germain / ssd1306_library

A class for managing SSD1306 controlled LCD´s (cheap 128x64 models, 0.96'') with more scroll features

Dependents:   2PA2S 2PA2S_v2

ssd1306.h@10:e5341e7eb825, 2019-10-07 (annotated)

Committer:
Germaint
Date:
Mon Oct 07 18:10:07 2019 +0000
Revision:
10:e5341e7eb825
Parent:
9:57209a7e9cba 
Add some features

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rodriguj 0:3d84b3bfb794 1 /*
rodriguj 4:35757c8b7625 2 * ssd1306.cpp
rodriguj 0:3d84b3bfb794 3 *
rodriguj 0:3d84b3bfb794 4 * Created on: 20 oct. 2017
rodriguj 3:bb6fba3e84ff 5 * Author: Miguel Angel Rodriguez Jodar
rodriguj 3:bb6fba3e84ff 6 *
rodriguj 3:bb6fba3e84ff 7 * Based upon Adafruit library.
rodriguj 3:bb6fba3e84ff 8 * GPL licensed.
rodriguj 3:bb6fba3e84ff 9 *
rodriguj 0:3d84b3bfb794 10 */
rodriguj 3:bb6fba3e84ff 11
rodriguj 0:3d84b3bfb794 12 #ifndef MBED_SSD1306_LIBRARY
rodriguj 0:3d84b3bfb794 13 #define MBED_SSD1306_LIBRARY
rodriguj 0:3d84b3bfb794 14
rodriguj 0:3d84b3bfb794 15 #include "mbed.h"
rodriguj 0:3d84b3bfb794 16
rodriguj 4:35757c8b7625 17 #define SSD1306_IS_COMMAND 0x00
rodriguj 4:35757c8b7625 18 #define SSD1306_IS_DATA 0x40
rodriguj 4:35757c8b7625 19 #define SSD1306_IS_NOT_LAST 0x80
rodriguj 4:35757c8b7625 20 #define SSD1306_IS_LAST 0x00
rodriguj 0:3d84b3bfb794 21
rodriguj 0:3d84b3bfb794 22 #define SSD1306_SETCONTRAST 0x81
rodriguj 0:3d84b3bfb794 23 #define SSD1306_DISPLAYALLON_RESUME 0xA4
rodriguj 0:3d84b3bfb794 24 #define SSD1306_DISPLAYALLON 0xA5
rodriguj 0:3d84b3bfb794 25 #define SSD1306_NORMALDISPLAY 0xA6
rodriguj 0:3d84b3bfb794 26 #define SSD1306_INVERTDISPLAY 0xA7
rodriguj 0:3d84b3bfb794 27 #define SSD1306_DISPLAYOFF 0xAE
rodriguj 0:3d84b3bfb794 28 #define SSD1306_DISPLAYON 0xAF
rodriguj 0:3d84b3bfb794 29
rodriguj 0:3d84b3bfb794 30 #define SSD1306_SETDISPLAYOFFSET 0xD3
rodriguj 0:3d84b3bfb794 31 #define SSD1306_SETCOMPINS 0xDA
rodriguj 0:3d84b3bfb794 32
rodriguj 0:3d84b3bfb794 33 #define SSD1306_SETVCOMDETECT 0xDB
rodriguj 0:3d84b3bfb794 34
rodriguj 0:3d84b3bfb794 35 #define SSD1306_SETDISPLAYCLOCKDIV 0xD5
rodriguj 0:3d84b3bfb794 36 #define SSD1306_SETPRECHARGE 0xD9
rodriguj 0:3d84b3bfb794 37
rodriguj 0:3d84b3bfb794 38 #define SSD1306_SETMULTIPLEX 0xA8
rodriguj 0:3d84b3bfb794 39
rodriguj 0:3d84b3bfb794 40 #define SSD1306_SETLOWCOLUMN 0x00
rodriguj 0:3d84b3bfb794 41 #define SSD1306_SETHIGHCOLUMN 0x10
rodriguj 0:3d84b3bfb794 42
rodriguj 0:3d84b3bfb794 43 #define SSD1306_SETSTARTLINE 0x40
rodriguj 0:3d84b3bfb794 44
rodriguj 0:3d84b3bfb794 45 #define SSD1306_MEMORYMODE 0x20
rodriguj 0:3d84b3bfb794 46
rodriguj 0:3d84b3bfb794 47 #define SSD1306_COMSCANINC 0xC0
rodriguj 0:3d84b3bfb794 48 #define SSD1306_COMSCANDEC 0xC8
rodriguj 0:3d84b3bfb794 49
rodriguj 0:3d84b3bfb794 50 #define SSD1306_SEGREMAP 0xA0
rodriguj 0:3d84b3bfb794 51
rodriguj 0:3d84b3bfb794 52 #define SSD1306_CHARGEPUMP 0x8D
rodriguj 0:3d84b3bfb794 53
rodriguj 0:3d84b3bfb794 54 #define SSD1306_EXTERNALVCC 0x1
rodriguj 0:3d84b3bfb794 55 #define SSD1306_SWITCHCAPVCC 0x2
rodriguj 0:3d84b3bfb794 56
rodriguj 0:3d84b3bfb794 57 // Scrolling #defines
rodriguj 0:3d84b3bfb794 58 #define SSD1306_ACTIVATE_SCROLL 0x2F
rodriguj 0:3d84b3bfb794 59 #define SSD1306_DEACTIVATE_SCROLL 0x2E
rodriguj 0:3d84b3bfb794 60 #define SSD1306_SET_VERTICAL_SCROLL_AREA 0xA3
rodriguj 0:3d84b3bfb794 61 #define SSD1306_RIGHT_HORIZONTAL_SCROLL 0x26
rodriguj 0:3d84b3bfb794 62 #define SSD1306_LEFT_HORIZONTAL_SCROLL 0x27
rodriguj 0:3d84b3bfb794 63 #define SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL 0x29
rodriguj 0:3d84b3bfb794 64 #define SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL 0x2A
rodriguj 0:3d84b3bfb794 65
rodriguj 7:b0e7ccc9138b 66 /**
rodriguj 7:b0e7ccc9138b 67 * SSD1306. A class for interacting with SSD1306 controlled 128x64 cheap OLED displays
rodriguj 8:09b1578f93d9 68 *
rodriguj 8:09b1578f93d9 69 * Example of use:
rodriguj 8:09b1578f93d9 70 * @code
rodriguj 8:09b1578f93d9 71 * #include "mbed.h"
rodriguj 8:09b1578f93d9 72 * #include "ssd1306.h"
rodriguj 8:09b1578f93d9 73 *
rodriguj 8:09b1578f93d9 74 * SSD1306 lcd (I2C_SDA, I2C_SCL); // assumes default I2C address of 0x78
rodriguj 8:09b1578f93d9 75 * AnalogIn knob (A0); // potentiometer to analog pin A0
rodriguj 8:09b1578f93d9 76 *
rodriguj 8:09b1578f93d9 77 * int main()
rodriguj 8:09b1578f93d9 78 * {
rodriguj 8:09b1578f93d9 79 * lcd.speed (SSD1306::Medium); // set working frequency
rodriguj 8:09b1578f93d9 80 * lcd.init(); // initialize SSD1306
rodriguj 8:09b1578f93d9 81 * lcd.cls(); // clear frame buffer
rodriguj 8:09b1578f93d9 82 * lcd.locate (3,1); // set text cursor to line 3, column 1
rodriguj 8:09b1578f93d9 83 * lcd.printf ("Hello, world!"); // print to frame buffer
rodriguj 9:57209a7e9cba 84 * lcd.line ( 6, 22, 114, 22, SSD1306::Normal); //
rodriguj 9:57209a7e9cba 85 * lcd.line (114, 22, 114, 33, SSD1306::Normal); // Surrounds text with
rodriguj 9:57209a7e9cba 86 * lcd.line (114, 33, 6, 33, SSD1306::Normal); // a rectangle
rodriguj 9:57209a7e9cba 87 * lcd.line ( 6, 33, 6, 22, SSD1306::Normal); //
rodriguj 8:09b1578f93d9 88 * lcd.fill (0, 0); // fills screen outside rectangle
rodriguj 8:09b1578f93d9 89 * lcd.redraw(); // updates actual display transferring frame buffer over I2C bus
rodriguj 8:09b1578f93d9 90 * while (1) {
rodriguj 8:09b1578f93d9 91 * unsigned char level = 255*knob.read(); // reads pot. Scales to 0-255
rodriguj 8:09b1578f93d9 92 * lcd.set_contrast (level); // set contrast
rodriguj 8:09b1578f93d9 93 * wait_ms (20); // waits a little to prevent excesive I2C traffic
rodriguj 8:09b1578f93d9 94 * }
rodriguj 8:09b1578f93d9 95 * }
rodriguj 8:09b1578f93d9 96 * @endcode
rodriguj 7:b0e7ccc9138b 97 */
rodriguj 4:35757c8b7625 98 class SSD1306 {
rodriguj 0:3d84b3bfb794 99 public:
rodriguj 6:cff0e772910f 100 /**
rodriguj 6:cff0e772910f 101 * PlotStyle. Defines how pixels being plotted interact with existing pixels on the screen
rodriguj 6:cff0e772910f 102 */
rodriguj 0:3d84b3bfb794 103 enum PlotStyle
rodriguj 0:3d84b3bfb794 104 {
rodriguj 8:09b1578f93d9 105 Normal, /**< The point is set on the display */
rodriguj 8:09b1578f93d9 106 Inverse, /**< The point is erased on the display */
rodriguj 8:09b1578f93d9 107 Xor /**< The point is erased on the display if it was already set, otherwise, it is set */
rodriguj 0:3d84b3bfb794 108 };
rodriguj 0:3d84b3bfb794 109
rodriguj 6:cff0e772910f 110 /**
rodriguj 6:cff0e772910f 111 * I2CSpeed. Defines the speed of the I2C bus
rodriguj 6:cff0e772910f 112 */
rodriguj 0:3d84b3bfb794 113 enum I2CSpeed
rodriguj 0:3d84b3bfb794 114 {
rodriguj 8:09b1578f93d9 115 Slow, /**< I2C frequency is set to 100 kHz */
rodriguj 8:09b1578f93d9 116 Medium, /**< I2C frequency is set to 400 kHz */
rodriguj 8:09b1578f93d9 117 Fast /**< I2C frequency is set to 1 MHz. Use it only with short connections to host */
rodriguj 0:3d84b3bfb794 118 };
rodriguj 0:3d84b3bfb794 119
rodriguj 6:cff0e772910f 120 /**
rodriguj 6:cff0e772910f 121 * Creates an instance of a SSD1306 driver, specifying I2C pins to use
rodriguj 6:cff0e772910f 122 *
rodriguj 6:cff0e772910f 123 * @param sda I2C data line pin
rodriguj 6:cff0e772910f 124 * @param scl I2C clock line pin
rodriguj 6:cff0e772910f 125 */
rodriguj 3:bb6fba3e84ff 126 SSD1306 (PinName sda, PinName scl, char ssd1306_addr = 0x78);
rodriguj 3:bb6fba3e84ff 127
rodriguj 6:cff0e772910f 128 /**
rodriguj 6:cff0e772910f 129 * Creates an instance of a SSD1306 driver using an existing I2C object
rodriguj 6:cff0e772910f 130 *
rodriguj 6:cff0e772910f 131 * @param busi2c I2C object
rodriguj 6:cff0e772910f 132 * @param ssd1306_addr I2C addr of SSD1306 controller
rodriguj 6:cff0e772910f 133 */
rodriguj 3:bb6fba3e84ff 134 SSD1306 (I2C &busi2c, char ssd1306_addr = 0x78);
rodriguj 0:3d84b3bfb794 135
rodriguj 6:cff0e772910f 136 /**
rodriguj 6:cff0e772910f 137 * Set the frequency of the I2C interface
rodriguj 6:cff0e772910f 138 *
rodriguj 6:cff0e772910f 139 * @param hz The bus frequency in hertz
rodriguj 6:cff0e772910f 140 */
rodriguj 0:3d84b3bfb794 141 void speed (I2CSpeed spd);
rodriguj 0:3d84b3bfb794 142
rodriguj 6:cff0e772910f 143 /**
rodriguj 6:cff0e772910f 144 * Initialize the SSD1306 controller
rodriguj 6:cff0e772910f 145 */
rodriguj 0:3d84b3bfb794 146 int init (void);
rodriguj 0:3d84b3bfb794 147
rodriguj 6:cff0e772910f 148 /**
rodriguj 6:cff0e772910f 149 * Scrolls up one text line
rodriguj 6:cff0e772910f 150 *
rodriguj 6:cff0e772910f 151 * @param refresh (optional) Force an actual screen redraw after scrolling
rodriguj 6:cff0e772910f 152 */
rodriguj 1:c5cf4ca5939f 153 void scroll (bool refresh=false);
rodriguj 0:3d84b3bfb794 154
rodriguj 6:cff0e772910f 155 /**
rodriguj 6:cff0e772910f 156 * Print a character at the current text position. Updates the text position and forces a scroll if at the end of the screen
rodriguj 6:cff0e772910f 157 *
rodriguj 6:cff0e772910f 158 * @param c ASCII code of the character to print (8-bit ASCII code, use original IBM code page 437. No control codes.
rodriguj 6:cff0e772910f 159 * @param refresh (optional) Force an actual screen redraw after scrolling
rodriguj 6:cff0e772910f 160 */
rodriguj 1:c5cf4ca5939f 161 void putchar (char c, bool refresh=false);
rodriguj 0:3d84b3bfb794 162
rodriguj 6:cff0e772910f 163 /**
rodriguj 6:cff0e772910f 164 * Prints a NUL terminated string
rodriguj 6:cff0e772910f 165 *
rodriguj 6:cff0e772910f 166 * @param s C-style string (NUL terminated) to print.
rodriguj 8:09b1578f93d9 167 * @param refresh (optional) Force an actual screen redraw after the operation
rodriguj 6:cff0e772910f 168 */
rodriguj 2:7f1160c1a741 169 void puts (char *s, bool refresh=false);
rodriguj 3:bb6fba3e84ff 170
rodriguj 6:cff0e772910f 171 /**
rodriguj 6:cff0e772910f 172 * printf interface to SSD1306 controller
rodriguj 6:cff0e772910f 173 *
rodriguj 6:cff0e772910f 174 * @param fmt Format string.
rodriguj 6:cff0e772910f 175 */
rodriguj 4:35757c8b7625 176 void printf (const char *fmt,...);
rodriguj 2:7f1160c1a741 177
rodriguj 6:cff0e772910f 178 /**
rodriguj 6:cff0e772910f 179 * Change the text position
rodriguj 6:cff0e772910f 180 *
rodriguj 6:cff0e772910f 181 * @param row Text row (0-7) to print the next character
rodriguj 6:cff0e772910f 182 * @param column Text column (0-15) to print the next character
rodriguj 6:cff0e772910f 183 */
rodriguj 2:7f1160c1a741 184 void locate (char row, char column);
rodriguj 2:7f1160c1a741 185
rodriguj 6:cff0e772910f 186 /**
rodriguj 8:09b1578f93d9 187 * (Deprecated: use redraw instead) Redraws the physical display, sending the content of the display memory to the SSD1306 controller using the I2C bus.
rodriguj 6:cff0e772910f 188 */
rodriguj 0:3d84b3bfb794 189 void display (void);
rodriguj 0:3d84b3bfb794 190
rodriguj 6:cff0e772910f 191 /**
rodriguj 8:09b1578f93d9 192 * Redraws the physical display, sending the content of the display memory to the SSD1306 controller using the I2C bus
rodriguj 8:09b1578f93d9 193 */
rodriguj 8:09b1578f93d9 194 void redraw (void);
rodriguj 8:09b1578f93d9 195
rodriguj 8:09b1578f93d9 196 /**
rodriguj 6:cff0e772910f 197 * Changes the contrast (actually, pixel brightness) of the screen
rodriguj 6:cff0e772910f 198 *
rodriguj 6:cff0e772910f 199 * @param v Contrast level (0-255)
rodriguj 6:cff0e772910f 200 */
rodriguj 0:3d84b3bfb794 201 void set_contrast (char v);
rodriguj 0:3d84b3bfb794 202
rodriguj 6:cff0e772910f 203 /**
rodriguj 6:cff0e772910f 204 * Clear screen and optionally, fills it with a predefined picture (in 128x64 OLED format, see display datasheet). Also resets the text position.
rodriguj 6:cff0e772910f 205 *
rodriguj 6:cff0e772910f 206 * @param bkground If not NULL, should point to a 1024 byte buffer with the image to load to the display
rodriguj 8:09b1578f93d9 207 * @param refresh (optional) Force an actual screen redraw after the operation
rodriguj 6:cff0e772910f 208 */
rodriguj 1:c5cf4ca5939f 209 void cls (char *bkground=NULL, bool refresh=false);
rodriguj 0:3d84b3bfb794 210
rodriguj 6:cff0e772910f 211 /**
rodriguj 6:cff0e772910f 212 * Plots a pixel.
rodriguj 6:cff0e772910f 213 *
rodriguj 6:cff0e772910f 214 * @param x x-coordinate (0-127) of the pixel. X coordinates go left to right.
rodriguj 6:cff0e772910f 215 * @param y y-coordinate (0-63) of the pixel. Y coordinates go up to down.
rodriguj 6:cff0e772910f 216 * @param mode. Plot style mode: Normal (pixel is drawn), Inverse (pixel is erased), or Xor (pixel is erased if background position is already set, otherwise is drawn)
rodriguj 8:09b1578f93d9 217 * @param refresh (optional) Force an actual screen redraw after plotting
rodriguj 6:cff0e772910f 218 */
rodriguj 4:35757c8b7625 219 void plot (char x, char y, PlotStyle mode, bool refresh=false);
rodriguj 1:c5cf4ca5939f 220
rodriguj 6:cff0e772910f 221 /**
rodriguj 6:cff0e772910f 222 * Returns the state of a pixel coordinate from screen
rodriguj 6:cff0e772910f 223 *
rodriguj 6:cff0e772910f 224 * @param x x-coordinate (0-127) of the pixel. X coordinates go left to right.
rodriguj 6:cff0e772910f 225 * @param y y-coordinate (0-63) of the pixel. Y coordinates go up to down.
rodriguj 6:cff0e772910f 226 * @return true if the pixel was set, or false otherwise
rodriguj 6:cff0e772910f 227 */
rodriguj 3:bb6fba3e84ff 228 bool point (char x, char y);
rodriguj 3:bb6fba3e84ff 229
rodriguj 6:cff0e772910f 230 /**
rodriguj 6:cff0e772910f 231 * Draws a line using the Bresenham algorithm
rodriguj 6:cff0e772910f 232 *
rodriguj 6:cff0e772910f 233 * @param x0 x-coordinate (0-127) of the starting point
rodriguj 6:cff0e772910f 234 * @param y0 y-coordinate (0-63) of the starting point
rodriguj 6:cff0e772910f 235 * @param x1 x-coordinate (0-127) of the ending point
rodriguj 6:cff0e772910f 236 * @param y1 y-coordinate (0-63) of the ending point
rodriguj 6:cff0e772910f 237 * @param mode. Plot style mode: Normal (pixel is drawn), Inverse (pixel is erased), or Xor (pixel is erased if background position is already set, otherwise is drawn)
rodriguj 8:09b1578f93d9 238 * @param refresh (optional) Force an actual screen redraw after drawing the line
rodriguj 6:cff0e772910f 239 */
rodriguj 4:35757c8b7625 240 void line (char x0, char y0, char x1, char y1, PlotStyle mode, bool refresh=false);
rodriguj 0:3d84b3bfb794 241
rodriguj 6:cff0e772910f 242 /**
rodriguj 6:cff0e772910f 243 * Draws a circle
rodriguj 6:cff0e772910f 244 *
rodriguj 6:cff0e772910f 245 * @param x0 x-coordinate (0-127) of the center point
rodriguj 6:cff0e772910f 246 * @param y0 y-coordinate (0-63) of the center point
rodriguj 6:cff0e772910f 247 * @param r radius of the circle
rodriguj 6:cff0e772910f 248 * @param mode. Plot style mode: Normal (pixel is drawn), Inverse (pixel is erased), or Xor (pixel is erased if background position is already set, otherwise is drawn)
rodriguj 8:09b1578f93d9 249 * @param refresh (optional) Force an actual screen redraw after drawing the shape
rodriguj 6:cff0e772910f 250 */
rodriguj 4:35757c8b7625 251 void circle (char x0, char y0, char r, PlotStyle mode, bool refresh=false);
rodriguj 3:bb6fba3e84ff 252
rodriguj 8:09b1578f93d9 253 /**
rodriguj 8:09b1578f93d9 254 * Flood fills an area surrounded by the screen edge and/or a closed shape.
rodriguj 8:09b1578f93d9 255 *
rodriguj 8:09b1578f93d9 256 * @param x x-coordinate (0-127) of a point inside the area to fill, not plotted
rodriguj 8:09b1578f93d9 257 * @param y y-coordinate (0-63) of a point inside the area to fill, not plotted
rodriguj 8:09b1578f93d9 258 * @param refresh (optional) Force an actual screen redraw after the operation
rodriguj 8:09b1578f93d9 259 */
rodriguj 8:09b1578f93d9 260 void fill (char x, char y, bool refresh=false);
rodriguj 8:09b1578f93d9 261
Germaint 10:e5341e7eb825 262 /** Set up and start a continuous horizontal scroll.
Germaint 10:e5341e7eb825 263 * Once you have set up the scrolling, you can deactivate it with stop_scroll().
Germaint 10:e5341e7eb825 264 * @param direction 0 for right, 1 for left.
Germaint 10:e5341e7eb825 265 * @param start Start page address, 0 - 5.
Germaint 10:e5341e7eb825 266 * @param end End page address, 0 - 5.
Germaint 10:e5341e7eb825 267 * @param interval Interval in frame frequency. Valid values are: 2, 3, 4, 5, 25, 64, 128, 256.
Germaint 10:e5341e7eb825 268 * @see stop_scrol
Germaint 10:e5341e7eb825 269 */
Germaint 10:e5341e7eb825 270 void start_horizontal_scroll(unsigned char direction, unsigned char start, unsigned char end, unsigned char interval);
Germaint 10:e5341e7eb825 271
Germaint 10:e5341e7eb825 272 /** Set up and start a continuous horizontal and vertical scroll.
Germaint 10:e5341e7eb825 273 * NOTE: No continuous vertical scroll is available.
Germaint 10:e5341e7eb825 274 * Once you have set up the scrolling, you can deactivate it with stop_scroll().
Germaint 10:e5341e7eb825 275 * @param direction 0 for vertical and right horizontal scroll, 1 for vertical and left horizontal scroll.
Germaint 10:e5341e7eb825 276 * @param start Start page address, 0 - 5.
Germaint 10:e5341e7eb825 277 * @param end End page address, 0 - 5.
Germaint 10:e5341e7eb825 278 * @param interval Interval in frame frequency. Valid values are: 2, 3, 4, 5, 25, 64, 128, 256.
Germaint 10:e5341e7eb825 279 * @param vertical_offset Offset of vertical scroll, 1 - 63.
Germaint 10:e5341e7eb825 280 * @see stop_scroll
Germaint 10:e5341e7eb825 281 */
Germaint 10:e5341e7eb825 282 void start_vertical_and_horizontal_scroll(unsigned char direction, unsigned char start, unsigned char end, unsigned char interval, unsigned char vertical_offset);
Germaint 10:e5341e7eb825 283
Germaint 10:e5341e7eb825 284 /** Deactivate the continuous scroll set up with start_horizontal_scroll() or
Germaint 10:e5341e7eb825 285 * start_vertical_and_horizontal_scroll().
Germaint 10:e5341e7eb825 286 * @see set_horizontal_scroll, set_vertical_and_horizontal_scroll
Germaint 10:e5341e7eb825 287 */
Germaint 10:e5341e7eb825 288 void stop_scroll();
Germaint 10:e5341e7eb825 289
Germaint 10:e5341e7eb825 290 /** Turn the whole display off. This will reset all configuration settings on the controller to their defaults. */
Germaint 10:e5341e7eb825 291 void off();
Germaint 10:e5341e7eb825 292
Germaint 10:e5341e7eb825 293 /** Turn the whole display on. Used during initialisation. */
Germaint 10:e5341e7eb825 294 void on();
Germaint 10:e5341e7eb825 295
Germaint 10:e5341e7eb825 296 void sleep();
Germaint 10:e5341e7eb825 297
Germaint 10:e5341e7eb825 298 void wake();
Germaint 10:e5341e7eb825 299
rodriguj 0:3d84b3bfb794 300 virtual ~SSD1306 () {
rodriguj 3:bb6fba3e84ff 301 if (!do_not_delete_bus)
rodriguj 3:bb6fba3e84ff 302 delete bus;
rodriguj 0:3d84b3bfb794 303 delete fb;
rodriguj 0:3d84b3bfb794 304 }
rodriguj 0:3d84b3bfb794 305
rodriguj 0:3d84b3bfb794 306 protected:
rodriguj 4:35757c8b7625 307 I2C *bus; // I2C object
rodriguj 4:35757c8b7625 308 char ssd1306_i2c_addr; // I2C address of SSD1306 controller
rodriguj 4:35757c8b7625 309 char *fb; // pointer to display buffer (1024 bytes)
rodriguj 4:35757c8b7625 310 char do_not_delete_bus; // flag to prevent deletion of bus when destroying SSD1306 object
rodriguj 4:35757c8b7625 311 int idxfb; // Current text position (referred to screen address memory)
rodriguj 4:35757c8b7625 312 int command (char c); // Sends a I2C command to SSD1306
rodriguj 4:35757c8b7625 313 int data (char d); // Sends I2C data to SSD1306
rodriguj 4:35757c8b7625 314 int command_data (char c, char c_or_d, char lastitem); // Sends a command or data and signal if it is not the last command/data in a list
rodriguj 4:35757c8b7625 315 char scan (); // Scans the I2C bus searcing for I2C id's 0x78 or 0x7A. Currently not used
rodriguj 0:3d84b3bfb794 316 };
rodriguj 0:3d84b3bfb794 317
rodriguj 0:3d84b3bfb794 318 #endif