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:
- 5:6d2aded0cf41
- Parent:
- 4:a675a19c16f0
diff -r a675a19c16f0 -r 6d2aded0cf41 spk_oled_ssd1305.h --- a/spk_oled_ssd1305.h Sun Oct 28 19:53:49 2012 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,147 +0,0 @@ -// 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. - */ - -#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, 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. - * - * 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); - - /** Write a single character in the object's display representation - * Requires the font to have been set - * - * @param character The character to write. - * @param x The x position to draw the character - * @param row The row in which to write the character - */ - void characterToBuffer(char character, int x, 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