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.cpp
- Committer:
- tobyspark
- Date:
- 2012-04-15
- Revision:
- 0:76bb084fa033
- Child:
- 1:dd3faa2ab1dd
File content as of revision 0:76bb084fa033:
// *spark audio-visual // OLED display using SSD1305 driver // Copyright *spark audio-visual 2012 #include "spk_oled_ssd1305.h" #include "mbed.h" SPKDisplay::SPKDisplay(PinName mosiPin, PinName clkPin, PinName csPin, PinName dcPin, PinName resPin, Serial *debugSerial) { bufferHasChanged = false; spi = new SPI(mosiPin, NC, clkPin); spi->format(8,3); spi->frequency(2000000); cs = new DigitalOut(csPin); dc = new DigitalOut(dcPin); res = new DigitalOut(resPin); // Link up debug Serial object // Passing in shared object as debugging is shared between all DVI mixer functions debug = debugSerial; setup(); clearBuffer(); if (debug) debug->printf("SPKDisplay loaded\n\r"); } void SPKDisplay::clearBuffer() { memset(buffer, 0, bufferCount); bufferHasChanged = true; } void SPKDisplay::imageToBuffer() { memcpy(buffer, image, bufferCount); bufferHasChanged = true; } void SPKDisplay::clearBufferRow(int row) { // Range check if (row >= 8) { if (debug) debug->printf("SPKDisplay::clearBufferRow sent out of bounds row"); return; } int bStart = row*bufferWidth; int bEnd = bStart + pixelWidth; for (int bPos = bStart; bPos <= bEnd; bPos++) { buffer[bPos] = 0x00; } bufferHasChanged = true; } void SPKDisplay::horizLineToBuffer(int y) { if (y >= pixelHeight) { if (debug) debug->printf("SPKDisplay::clearBufferRow sent out of bounds y"); return; } int row = (y*pixInPage) / pixelHeight; int posInRow = y % pixInPage; int bStart = row*bufferWidth; int bEnd = bStart + pixelWidth; for (int bPos = bStart; bPos <= bEnd; bPos++) { // Need to bitwise OR as setting single bit (the line) in byte (the row) buffer[bPos] = buffer[bPos] | 0x01 << posInRow; } bufferHasChanged = true; } void SPKDisplay::textToBuffer(std::string message, int row) { // Range check if (row >= 8) row = 7; int bStart = row*bufferWidth; int bEnd = bStart + pixelWidth; int bPos = bStart; for (int i = 0; i < message.size(); i++) { char character = message.at(i); // Is it outside the range we have glyphs for? if ((character < characterBytesStartChar) || (character > characterBytesEndChar)) { // Treat as a space for (int j = 0; j < 5; j++) { if (bPos >= bEnd) break; buffer[bPos++] = 0x00; } // Warn if not if (debug) { if (character != ' ') debug->printf("No glyph for character %c at position %i", character, i); } } // If not, typeset it! else { // Shift into our array's indexing character -= characterBytesStartChar; // Write each byte's vertical column of 8bits into the buffer. for (int j = 0; j < characterBytes[character][0]; j++) { if (bPos >= bEnd) break; buffer[bPos++] = characterBytes[character][j+1]; } // Put 1px letter spacing at end if (bPos >= bEnd) break; buffer[bPos++] = 0x00; // 1 px letter spacing } } bufferHasChanged = true; } void SPKDisplay::sendBuffer() { if (bufferHasChanged) { // Select the device by seting chip select low *cs = 0; // Set to receive DATA not commands *dc = 1; for (int i = 0; i < bufferCount; i++) { spi->write(buffer[i]); } // Deselect the device *cs = 1; bufferHasChanged = false; } } void SPKDisplay::setup() { // TASK: SCREEN OFF, Run pre-flight // Hard reset the OLED *res = 0; wait_ms(1); *res = 1; // Select the device by seting chip select low *cs = 0; // Set to receive COMMANDS not data *dc = 0; spi->write(0xAE); // set display off spi->write(0xD5); // set display clock divide ratio spi->write(0xA0); spi->write(0xA8); // set multiplex ratio spi->write(0x3F); spi->write(0xD3); // set display offset spi->write(0x00); spi->write(0x40); // set display start line spi->write(0xAD); // set master configuration spi->write(0x8E); spi->write(0xD8); // set area color mode spi->write(0x05); spi->write(0xA1); // set segment re-map spi->write(0xC8); // set com output scan direction spi->write(0xDA); // set com pins hardware configuration spi->write(0x12); spi->write(0x91); // set look-up table spi->write(0x3F); spi->write(0x3F); spi->write(0x3F); spi->write(0x3F); spi->write(0x81); // set current control for bank 0 spi->write(0x8F); spi->write(0xD9); // set pre-charge period spi->write(0xD2); spi->write(0xDB); //set vcomh deselect level spi->write(0x34); spi->write(0xA4); // set entire display on/off spi->write(0xA6); // set normal/inverse display spi->write(0x20); // page mode spi->write(0x00); // TASK: Clear screen's content buffer // Is this neccessary when switching command/data? *cs = 1; wait_ms(1); *cs = 0; // Set to receive DATA not commands *dc = 1; for (int i = 0; i < bufferCount; i++) { spi->write(0x00); } // TASK: SCREEN ON // Is this neccessary when switching command/data? *cs = 1; wait_ms(1); *cs = 0; // Set to receive COMMANDS not data *dc = 0; spi->write(0xAF); // set display on // Deselect the device *cs = 1; }