chris stevens
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 
Toby Harris
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
Last commit 29 Jan 2013 by 
chris stevens
#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
--- /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