SPKDisplay - A mbed display class and processing imaging tools for 128x64 OLEDs using the SSD1305 driver, connected via SPI. This variant drives a Unigraphics oled on the same driver but in page mode. Includes a simple 5x7 ascii font
Fork of spk_oled_ssd1305 by
OLED driver and demo for Univision oled display 128x64.
Modified Toby Harris' code to run page mode addressing in 4 wire SPI on the Univision UG-2864HSWEG01 128X64 unit - often found for sale on ebay. That's where I got mine anyhow.
Wiring this was fairly straightforward but you really do have to ground all the unused pins EXCEPT for number 8 to get it to work.
Here's the layout - I made a little carrier using a 2x8 connector and a couple of headers mounted on a small piece of stripboard. You can see all the wire links that are used to ground the unused pins. It was pretty awkward setting the display to run in 4 wire spi - had to desolder and resolder three smd o ohm links on the back o fhte pcb - ended up using a microscope to see them.
Here is the output of the demo code.
In page mode the display is effectively divided up into 8 horizontal strips, each 8 pixels high so lends itself nicley to displaying text in a 5x7 font. I've included the 5x7 lcd font in the code below.
Code
Import programunivision_oled
driver demo for univision oled dispaly
#include "mbed.h" #include "4spi_oled_ssd1305.h" /* re writtten to cope with teh ssd1306 driven oled UG-2864HSWEG01 from univision wiring for test circuit OLED pins -FUNCTION-------MBED PINns 1 ----3.3V--- Vout (p40) 2 ----0.0V--- GND (p1) 3 ----------- GND (p1) 4 ----------- GND (p1) 5 ----------- GND (p1) 6 ----------- GND (p1) 7 ----------- GND (p1) 8 ----------- N/C 9 ----D1---- mosi (p5) 10 ---D0------sck(p7) 11 ----------- GND (p1) 12 ----------- GND (p1) 13 ---DC------ p10 14 ---RES----- p9 15 ---CS------ p8 */ DigitalOut myled(LED1); // Create object and load font //SPKDisplay( mosiPin, clkPin, csPin, dcPin, resPin, Serial *debugSerial) SPKDisplay screen(p5, p7, p8, p10, p9); int main() { char msg[22]; sprintf(msg," "); // 01234567890abcdefghij int i=0; while(1==1) { myled=1; // nice logo output screen.welcome(); wait(3); wait(2); for(i=0; i<5; i++) { myled=0; screen.inverse(); wait(1); screen.normal(); myled=1; wait(1); } screen.fontdemo(); myled=0; wait(5); screen.clearBuffer(); screen.sendBuffer(); myled=1; wait(0.5); myled=0; wait(0.5); for(i=0; i<8; i++) { sprintf(msg,"HELLO WORLD %d",i); screen.textToBuffer(msg, i); screen.sendBuffer(); screen.clearBuffer(); myled=1; wait(1); } } }
Diff: 4spi_oled_ssd1305.h
- Revision:
- 5:6d2aded0cf41
diff -r a675a19c16f0 -r 6d2aded0cf41 4spi_oled_ssd1305.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/4spi_oled_ssd1305.h Tue Jan 29 09:56:25 2013 +0000 @@ -0,0 +1,143 @@ +// OLED display using SSD1305 driver +// A library by *spark audio-visual + +/* Copyright (c) 2011 Toby Harris, MIT License + * + * 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 without limitation the rights to use, copy, modify, merge, publish, distribute, + * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all copies or + * substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING + * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + + + /* rewritten to work with the SSD1306 driver JCY-MCU oled (from ebay). chris stevens 2013 + + */ + + +#ifndef SPK_OLED_SSD1305_h +#define SPK_OLED_SSD1305_h + +#include "mbed.h" +#include <string> + +#define bufferCount 1024 +#define bufferWidth 128 +#define pixelWidth 128 +#define pixelHeight 64 +#define pixInPage 8 +#define pageCount 8 + + + +/** Display class for 128x64 OLEDs using the SSD1305 driver, connected via SPI + * + * Display ie. DENSITRON - DD-12864YO-3A + * + * This is a ground-up, minimal library. Further functionality as and when its needed or anybody wants to contribute. + * + * This library includes two processing sketches to create a font and full-screen image in the required byte representations. + * Without creating your font and any images, all this library will do is blank the screen and draw horizontal lines. But at least you'll know its working! + * + * Terminology: + * 'rows' are 8 pixel high rows across the display, 0 being the topmost and 7 the bottom. + * 'lines' are single pixel lines, origin top left. + * +*/ +class SPKDisplay +{ +public: + /** Create a display object connected via SPI + * + * @param mosi SPI MOSI + * @param clk SPI SCK + * @param cs Chip Select - a digital out pin + * @param dc Data/Command - a digital out pin + * @param res Reset - a digital out pin + * @param debugSerial An optional serial object to log to + */ + SPKDisplay(PinName mosi, PinName clk, PinName cs, PinName dc, PinName res, Serial *debugSerial = NULL); + + /** Font - Assign the ASCII value of the character at the start of the implemented range */ + const int *fontStartCharacter; + + /** Font - Assign the ASCII value of the character at the end of the implemented range */ + const int *fontEndCharacter; + + /** Font - Assign the font, an array of 8x8px characters + * + * @note The processing sketch spk_oled_fontByteMaker--processing takes characterCount*8px x 8px images and creates the code to declare the font array needed by this method + */ + uint8_t const **fontCharacters; + + // set display for black on white + void inverse(); + +// display a welcopme message encoded in tab0 in spk_ole_ssd1305.h + void welcome(); + // output the entire font as a bitmap + void fontdemo(); + + //set display for white on black (normal state after reset) + void normal(); + + // power on / power off the display - this puts the display to sleep - but doesn turn off tha actuall power pin. + void displayPower(int P); + + /** Completely clear the object's display representation */ + void clearBuffer(); + + /** Clear a row of the object's display representation + * + * @param row The row to clear. + */ + void clearBufferRow(int row); + + /** Replace the object\s display representation with the contents of image + * + * @param image An array of 1056 bytes representing an image. + * @note The processing sketch spk_oled_screenByteMaker--processing takes 132x64 images and creates the code to declare such arrays + */ + void imageToBuffer(const uint8_t* image); + + /** Draw a horizontal line in the object's display representation + * + * @param y The y position of the line to draw + */ + void horizLineToBuffer(int y); + + + /** Send the object's display representation to the OLED + * + * You can safely call this once per main loop, it will only transmit the buffer contents if there has been an update + */ + void sendBuffer(); + +// send text to the buffer to write inthe tiny 5x7 font +void textToBuffer(char *message, int row); + +private: + SPI *spi; + DigitalOut *cs; + DigitalOut *dc; + DigitalOut *res; + + Serial *debug; + uint8_t buffer[bufferCount]; + + bool bufferHasChanged; + + void setup(); +}; + +#endif