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: spk_oled_ssd1305.h
- Revision:
- 0:76bb084fa033
- Child:
- 1:dd3faa2ab1dd
diff -r 000000000000 -r 76bb084fa033 spk_oled_ssd1305.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/spk_oled_ssd1305.h Sun Apr 15 16:51:01 2012 +0000 @@ -0,0 +1,98 @@ +// OLED display using SSD1305 driver +// Copyright *spark audio-visual 2012 + + +#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 + * ie. DENSITRON - DD-12864YO-3A + * + * This is a ground-up, minimal library. Currently it will display a full-screen image, draw horizontal lines, and display rows of text. + * + * This library includes two processing sketches to create a font and full-screen image in the required byte representations. + * It won't compile without you doing that - it expects const uint8_t image[] and const uint8_t* characterBytes[] + * + * 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 + * SPKDisplay screen(p5, p7, p8, p10, p9) + * screen.imageToBuffer(); + * 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); + + /** 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[] */ + void imageToBuffer(); + + /** 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 + * + * @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