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.cpp
- Revision:
- 5:6d2aded0cf41
- Parent:
- 4:a675a19c16f0
diff -r a675a19c16f0 -r 6d2aded0cf41 spk_oled_ssd1305.cpp --- a/spk_oled_ssd1305.cpp Sun Oct 28 19:53:49 2012 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,297 +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. - */ - -#include "spk_oled_ssd1305.h" -#include "mbed.h" - -SPKDisplay::SPKDisplay(PinName mosiPin, PinName clkPin, PinName csPin, PinName dcPin, PinName resPin, Serial *debugSerial) -{ - bufferHasChanged = false; - - fontStartCharacter = NULL; - fontEndCharacter = NULL; - fontCharacters = NULL; - - 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(const uint8_t* image) -{ - 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) -{ - // Font check - if (NULL == fontCharacters) return; - if (NULL == fontStartCharacter || NULL == fontEndCharacter) return; - - // 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 < *fontStartCharacter) || (character > *fontEndCharacter)) - { - // 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 -= *fontStartCharacter; - - // Write each byte's vertical column of 8bits into the buffer. - for (int j = 0; j < fontCharacters[character][0]; j++) - { - if (bPos >= bEnd) break; - buffer[bPos++] = fontCharacters[character][j+1]; - } - - // Put 1px letter spacing at end - if (bPos >= bEnd) break; - buffer[bPos++] = 0x00; // 1 px letter spacing - } - } - - bufferHasChanged = true; -} - -void SPKDisplay::characterToBuffer(char character, int x, int row) -{ - // Font check - if (NULL == fontCharacters) return; - if (NULL == fontStartCharacter || NULL == fontEndCharacter) return; - - // Range check - if (row >= 8) row = 7; - int bStart = row*bufferWidth; - int bEnd = bStart + pixelWidth; - - int bPos = bStart + x; - - // Is it outside the range we have glyphs for? - if ((character < *fontStartCharacter) || (character > *fontEndCharacter)) - { - if (debug) - { - if (character != ' ') debug->printf("No glyph for character %c", character); - } - } - // If not, typeset it! - else - { - // Shift into our array's indexing - character -= *fontStartCharacter; - - // Write each byte's vertical column of 8bits into the buffer. - for (int j = 0; j < fontCharacters[character][0]; j++) - { - if (bPos >= bEnd) break; - buffer[bPos++] = fontCharacters[character][j+1]; - } - } - - 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; -} \ No newline at end of file