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: 4spi_oled_ssd1305.cpp
- Revision:
- 5:6d2aded0cf41
diff -r a675a19c16f0 -r 6d2aded0cf41 4spi_oled_ssd1305.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/4spi_oled_ssd1305.cpp Tue Jan 29 09:56:25 2013 +0000 @@ -0,0 +1,670 @@ +// 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 "4spi_oled_ssd1305.h" +#include "mbed.h" + +// re written to handle page mode on ssd1305 128x64 unit CJS 2013 + +// nice logo - note the typo.... +static unsigned char logo_bits[] = { +0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, +0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, +0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, +0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, +0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, +0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 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0x55, 0x49, 0x41, 0x63, + 0x38, 0x44, 0x44, 0x3C, 0x04, + 0x40, 0x7E, 0x20, 0x1E, 0x20, + 0x06, 0x02, 0x7E, 0x02, 0x02, + 0x99, 0xA5, 0xE7, 0xA5, 0x99, + 0x1C, 0x2A, 0x49, 0x2A, 0x1C, + 0x4C, 0x72, 0x01, 0x72, 0x4C, + 0x30, 0x4A, 0x4D, 0x4D, 0x30, + 0x30, 0x48, 0x78, 0x48, 0x30, + 0xBC, 0x62, 0x5A, 0x46, 0x3D, + 0x3E, 0x49, 0x49, 0x49, 0x00, + 0x7E, 0x01, 0x01, 0x01, 0x7E, + 0x2A, 0x2A, 0x2A, 0x2A, 0x2A, + 0x44, 0x44, 0x5F, 0x44, 0x44, + 0x40, 0x51, 0x4A, 0x44, 0x40, + 0x40, 0x44, 0x4A, 0x51, 0x40, + 0x00, 0x00, 0xFF, 0x01, 0x03, + 0xE0, 0x80, 0xFF, 0x00, 0x00, + 0x08, 0x08, 0x6B, 0x6B, 0x08, + 0x36, 0x12, 0x36, 0x24, 0x36, + 0x06, 0x0F, 0x09, 0x0F, 0x06, + 0x00, 0x00, 0x18, 0x18, 0x00, + 0x00, 0x00, 0x10, 0x10, 0x00, + 0x30, 0x40, 0xFF, 0x01, 0x01, + 0x00, 0x1F, 0x01, 0x01, 0x1E, + 0x00, 0x19, 0x1D, 0x17, 0x12, + 0x00, 0x3C, 0x3C, 0x3C, 0x3C, + 0x00, 0x00, 0x00, 0x00, 0x00, +}; + + +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); + // changed to 9600 to test + spi->frequency(1000000); + + 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"); +} + +// set display for black on white +void SPKDisplay::inverse() +{ + *dc=0; + *cs=0; + spi->write(0xA7); + *dc=1; + *cs=1; +} + +//set display for white on black (normal state after reset) +void SPKDisplay::normal() +{ + *dc=0; + *cs=0; + spi->write(0xA6); + *dc=1; + *cs=1; +} + +void SPKDisplay::displayPower(int P) +{ + *dc=0; + *cs=0; + if(P==0) spi->write(0xAE); + else spi->write(0xAF); + *dc=1; + *cs=1; + +} + + +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(char *message, int row) +{ + char character; + // Range check + if (row >= 8) row = 7; + int bStart = row*bufferWidth; + int bEnd = bStart + pixelWidth; + + int bPos = bStart; + for (int i = 0; i < 21; i++) + { + character=message[i]; + + // Shift into our array's indexing + // character -= *fontStartCharacter; + + // Write each byte's vertical column of 8bits into the buffer. + for (int j = 0; j < 5;j++) + { + if (bPos >= bEnd) break; + buffer[bPos++] = font[character*5+j]; + } + + // Put 1px letter spacing at end + if (bPos >= bEnd) break; + buffer[bPos++] = 0x00; // 1 px letter spacing + + } + + bufferHasChanged = true; +} + + +// rewritten to cope with the paging +void SPKDisplay::sendBuffer() +{ + if (bufferHasChanged) { + // Select the device by seting chip select low + *cs = 0; // select chip + *dc = 0; // comand mode + + + unsigned char i=0,j=0; + for(i=0; i<8; i++) { + *dc=0; // command mode + spi->write(0xB0+i); //Set display position - paged display + spi->write(0x00); //Set display position - low column address + spi->write(0x10);//Set the display position - high column address + + *dc=1; // data mode + for(j=0; j<128; j++) { + spi->write(buffer[i*128+j]); //copy buffer into ram + + } + + } + + *cs = 1; + + bufferHasChanged = false; + } +} + +// display a welcome message encoded in tab0 in spk_ole_ssd1305.h +void SPKDisplay::welcome() +{ +// Select the device by seting chip select low + *cs = 0; // select chip + *dc = 0; // comand mode + + + unsigned char i=0,j=0; + for(i=0; i<8; i++) { + *dc=0; // command mode + spi->write(0xB0+i); //Set display position - paged display + spi->write(0x00); //Set display position - low column address + spi->write(0x10);//Set the display position - high column address + + *dc=1; // data mode + for(j=0; j<128; j++) { + // spi->write(tab0[i*128+j]); //copy buffer into ram + spi->write(logo_bits[i*128+j]); //copy buffer into ram + } + + } + + *cs = 1; + +} + + + +//================ +// display a welcome message encoded in tab0 in spk_ole_ssd1305.h +void SPKDisplay::fontdemo() +{ +// Select the device by seting chip select low + *cs = 0; // select chip + *dc = 0; // comand mode + + + unsigned char i=0,j=0; + for(i=0; i<8; i++) { + *dc=0; // command mode + spi->write(0xB0+i); //Set display position - paged display + spi->write(0x00); //Set display position - low column address + spi->write(0x10);//Set the display position - high column address + + *dc=1; // data mode + for(j=0; j<128; j++) { + // spi->write(tab0[i*128+j]); //copy buffer into ram + spi->write(font[i*128+j]); //copy buffer into ram + } + + } + + *cs = 1; + +} +//================= + +void SPKDisplay::setup() +{ + // TASK: SCREEN OFF, Run pre-flight + + // Hard reset the OLED + *res=1; + wait_ms(1); + *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; +//=======ALL THESE TAKEN FROM THE UNIVISION DATASHEET UNCHANGED========== + + spi->write(0x20); // set addressing mode + spi->write(0x10); // paged adressign mode + + spi->write(0x00); // set lower nyble column address + spi->write(0x10); // set higher column adress + spi->write(0x40); //set display start line to 0 + spi->write(0x81); // set contrast control register + spi->write(0xFF); // set contrast to maximum + + spi->write(0xA0); // [A0]:column address 0 is map to SEG0 , + //[A1]: columnaddress 131 is map to SEG0*/ + + spi->write(0xA4); // entire display ON - means that dispaly constaly matched to RAM content + + spi->write(0xA6); //normal display - white on black + + spi->write(0xA8); // set MUX ratio command + spi->write(0x3F); // MUX set to 36 + + spi->write(0x8D); //set DC-DC + spi->write(0x14); // 0x14=ON + + spi->write(0xAE); // set display off - sleep mode + + spi->write(0xD3); // set display offset + spi->write(0x00); // to no offset + + spi->write(0xD5); //set clock divide + spi->write(0x20); // to get clock at 80Hz + +//spi->write(0xD8); // set area color +//spi->write(0x00); + + spi->write(0xDA); // set pins configuration + spi->write(0x12); // com left - right remap , alternaitve com config - realtes to hardware settings on board + + spi->write(0xDB); // set VCOMHH level + spi->write(0x00); // to 0.65*Vcc + + spi->write(0xD9); // set pre charge period + spi->write(0x22); // P1=2, P2=2 + + spi->write(0xC0); // set COM ouptut scan normal + +//INI_DIS - initialise the display as per manufacturers example prog + + unsigned char i=0,j=0; + for(i=0; i<8; i++) { + *dc=0; // command mode + spi->write(0xB0+i); //Set display position - paged display + spi->write(0x02); //Set display position - low column address + spi->write(0x10);//Set the display position - high column address + + *dc=1; // set to receive data no commands + + for(j=0; j<128; j++) { + spi->write(0x00); //Screen display initial setting + + } + *dc=0; + spi->write(0xaf); // screen on + } + + + +} \ No newline at end of file