Using 4DSystems oLed displays
µOLED-160-G1(SGC)
The uOLED-160-G1(SGC) is a compact and cost effective all in one ‘SMART” serial display module using the latest state of the art Passive Matrix OLED (PMOLED) technology with an embedded GOLDELOX-SGC serial graphics controller that delivers ‘stand-alone’ functionality to any project.
- 160 x 128 resolution, 65K true to life colours, PMOLED screen.
- 1.7” diagonal size, 52 x 32 x 6.1mm. Active Area: 33.6mm x 27mm.
Wiring
| oLED pin | oLED symbol | FOX pin | FOX Symbol | Description |
|---|---|---|---|---|
| 1 | VCC In | J16.1 | VCC out | 5 volt DC power supply |
| 3 | TX | J16.2 | ttyS3 RX | oLED asynchronous TX data |
| 5 | RX | J16.3 | ttyS3 TX | oLED asynchronous RX data |
| 7 | GND | J16.4 | GND | Ground |
| 9 | RESET | J16.5 | N.C. | oLED reset line. Not connected on the FOX Board |
First test
To test the wiring we will use simple Python program.
Install Python typing:
debarm:/# apt-get update debarm:/# apt-get install python debarm:/# apt-get install python-serial
Then save this source in a file called clearscreen.py:
File: http://foxg20.acmesystems.it/download/examples/clearscreen.py -
#!/usr/bin/python # Import pySerial library # http://pyserial.sourceforge.net/index.html import serial # Open the serial port on J16 ser = serial.Serial( port='/dev/ttyS3', baudrate=115200, timeout=1, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS ) print ser.portstr # Check which port was really used ser.write("U") # Autobaud char s = ser.read(1) # Wait for a reply ser.write("E") # Clear screen s = ser.read(1) ser.close()
This program send a “U” character (55hex) to the oLed to setup the Autobaud rate then a “E” character (45hex) to clear the oLed screen.
To test it type:
debarm:/# wget http://foxg20.acmesystems.it/download/examples/clearscreen.py debarm:/# chmod +x clearscreen.py debarm:/# ./clearscreen.py
If everything is ok you will see the screen to become black.
Draw “String” of ASCII Text
Let's try now to write a simple command to write a text using the “s” 4Dsystems serial command Draw “String” of ASCII Text (text format) - 73hex explained on page 35 of the µOLED-160-G1(SGC) Serial command set.
File: http://foxg20.acmesystems.it/download/examples/4dprint.py -
#!/usr/bin/python import serial,sys,getopt try: opts, args = getopt.getopt(sys.argv[1:], "x:y:s:b") except getopt.GetoptError, err: # print help information and exit: print str(err) # will print something like "option -a not recognized" sys.exit(2) x=0 y=0 s="" clear = False for o, a in opts: if o == "-x": x = a elif o == "-y": y = a elif o == "-s": s = a elif o == "-b": clear = True else: assert False, "Unhandled option" # Open the serial port on J16 ser = serial.Serial( port='/dev/ttyS3', baudrate=115200, timeout=1, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS ) ser.write("U") # Autobaud char rtc = ser.read(1) # Wait for a reply if clear==True: ser.write("E") # Clear screen rtc = ser.read(1) # Wait for a reply ser.write("s%c%c%c%c%c%s%c" % (int(x),int(y),1,0xFF,0xFF,s,0x00)) rtc = ser.read(1) # Wait for a reply ser.close() # Close port
Download it typing:
debarm:/# wget http://foxg20.acmesystems.it/download/examples/4dprint.py debarm:/# chmod +x 4dprint.py
The usage is:
debarm:/# ./4dprint.py -x 0 -y 0 -s 'Hello World !' -b
Where:
- -x -y are the position (x=0, Y=0 is the left up cornen)
- -s is the string to print
- -b to erase the screen before print
Link
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