OLED

Driver for the Densitron DD-160128FC-1A

This is a 160x128 OLED display accessed via the SPI interface using the supplied driver. The driver supports the display of colour, fills, text and individual pixels. The display orientation can be selected by the driver too. The driver is based on MobileLCD written by Simon Ford and will work as a plug-in replacement except for the different width and height of the display. The display uses a Syncoam SEPS525F driver chip.

 

Hardware

The display itself, DD-160128FC-1A, is available (at time of writing) from Farnell as part number 1498857. This consists of the glass and a driver chip on a flexfoil connector. For prototyping I recommend using the Densitron connection board, EVK-CONNECT-010, available from Farnell as part number 1500758. This fans out the pins to a more manageable 0.1'' pitch strip.

The display requires two power supplies, 3v3 for the logic and 13V for the display.

Connections

Pin no. EVK Pin name Signal name MBed Pin
1 GND GND GND
2 GND GND
3 GND GND
4 GND> GND
5 VCC_IN +13V supply
6 GND GND
7 VDD_IN +3V3 supply
8 GND GND
9 not connected not connected
10 VSYNCO not connected
11 DOTCLK GND
12 VSYNC GND
13 ENABLE GND
14 HSYNC GND
15 not connected not connected
16 D9 GND
17 not connected not connected
18 not connected not connected
19 not connected not connected
20 not connected not connected
21 not connected not connected
22 not connected not connected
23 not connected not connected
24 not connected not connected
25 not connected not connected
26 not connected not connected
27 DC/DC EN not connected
28 CSB CS P8
29 RESETB RST P9
30 RS RS P10
31 WRB GND
32 RDB GND
33 D17 CLK P7
34 D16 MOSI P5
35 D15 GND
36 D14 GND
37 D13 GND
38 D12 GND
39 D11 GND
40 D10 GND

Link positions

There are three configuration links on the Densitron evaluation board. The two power supply links must obviously be in place.
PS VSS
CPU VSS
VDDIO VDD

Driver and test program

The driver and a test program can be imported from this address.
OLEDSeps525f
The test program exercises the main functions of the driver. The source code is shown below.
#include 
#include "mbed.h"
#include "OLEDSeps525f.h"
OLEDSeps525f lcd(p5, p6, p7, p8, p9, p10);

int main() {
    //Test background and clear screen
    lcd.background(0x0000FF);
    lcd.cls();
 
    //Test colour and fill
    lcd.fill(0, 50, lcd.width(), 10, 0x00FF00);
    lcd.fill(50, 0, 10, lcd.height(), 0xFF0000);
    //Test pixel writing
    for(int i=0; i!=lcd.width(); i++) {
        lcd.pixel(i, 80 + sin((float)i / 5.0)*10, 0x000000);
    }
    lcd.locate(0,1);
 
    //Test text and newline
    lcd.printf("OLED\ndriver\n");
    //Test tab
    lcd.printf("\ttab\t2\t3\t4");
    lcd.locate(0,10);
 
    //Test control codes
    lcd.printf("\t*\v*\v\b\b*\r*");
 
    //Test orientation
    lcd.locate(lcd.columns()/2-(strlen("Top  ")/2),1);
    lcd.printf("Top %u",lcd.orientation());
    lcd.orientation(1);
    lcd.locate(lcd.columns()/2-(strlen("Right  ")/2),1);
    lcd.printf("Right %u",lcd.orientation());
    lcd.orientation(2);
    lcd.locate(lcd.columns()/2-(strlen("Bottom  ")/2),1);
    lcd.printf("Bottom %u",lcd.orientation()); 
    lcd.orientation(3);
    lcd.locate(lcd.columns()/2-(strlen("Left  ")/2),1);
    lcd.printf("Left %u",lcd.orientation());

}

Photo

Here is a picture of the evaluation board being driven by the MBED. It's not the neatest prototype in the world since I've soldered directly to the pins of the Densitron evaluation board. The MBED, however, is in a DIL socket because I'd like to keep it clean and re-use it ;-) I drive the demo with a single 13V regulated D.C. supply which is then further regulated for the 3V3 required by the Densitron board and 5V for supplying the MBED via the VIN pin.

As is usual trying to photograph displays, it looks more washed-out than it actually is due to the amount of ambient light required to work with a camera that I can't use properly yet ;-) The colours, especially the blue are much deeper than the photo suggests. Another issue is that the display does flicker at 70Hz. This is fine for looking at but it took several attempts to get a photo without strobing artefacts.

OLED demo

References

 

Syncoam SEPS525F data sheet (link to Farnell website)

Evaluation board data sheet (link to Farnell website)


2 comments

05 Jun 2010 . Edited: 05 Jun 2010

Hello here is an EAGLE library for XF2M35151A socket which is used on that connection board.

It's with description on each pin :)

http://prusadjs.cz/eagle/OLED.lbr

Hello, please check what you are posting online, this library is WRONG.

It DOES NOT correspond to the 35pin socket, you will end up buringn your LCD and throwing away the pcb. The pinout corresponds to the breakout and not the 35 pin connector.

Please do not post such info if you are unsure or have not tested it first (or at least checked it)...

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