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); } } }
spk_oled_ssd1305.h
- Committer:
- tobyspark
- Date:
- 2012-04-15
- Revision:
- 1:dd3faa2ab1dd
- Parent:
- 0:76bb084fa033
- Child:
- 2:8187d69071f8
File content as of revision 1:dd3faa2ab1dd:
// OLED display using SSD1305 driver // Copyright *spark audio-visual 2012 // // This library is free software; you can redistribute it and/or // modify it under the terms of the GNU Lesser General Public // License version 3 as published by the Free Software Foundation. #ifndef SPK_OLED_SSD1305_h #define SPK_OLED_SSD1305_h #include "mbed.h" #include <string> #define bufferCount 1056 #define bufferWidth 132 #define pixelWidth 128 #define pixelHeight 64 #define pixInPage 8 #define pageCount 8 /** Display class for 128x64 OLEDs using the SSD1305 driver * 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 a font and image, 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 * * Example: * @code * // Create object and load font * SPKDisplay screen(p5, p7, p8, p10, p9) * screen.fontStartCharacter = &myStartChar; * screen.fontEndCharacter = &myEndChar; * screen.fontCharacters = myFontArray; * // Draw * screen.imageToBuffer(myImageByteArray); * screen.textToBuffer("*spark OLED SSD1305",0); * screen.textToBuffer("v01",1); * screen.sendBuffer * @endcode */ 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; /** 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); /** Write a line of text in the object's display representation * Requires the font to have been set * * @param message The text to write. The text will be truncated if longer than the screen's width. * @param row The row in which to write the text */ void textToBuffer(std::string message, int row); /** 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(); private: SPI *spi; DigitalOut *cs; DigitalOut *dc; DigitalOut *res; Serial *debug; uint8_t buffer[bufferCount]; bool bufferHasChanged; void setup(); }; #endif