Finally, as promised, the Onion I2C library is available as a Python module.

Check out this wiki post for details on how to install and use the module: https://wiki.onion.io/Tutorials/Libraries/I2C-Library

OLED Expansion Library

The OLED library has been updated with some new functions:

• Setting column addressing for text
• Setting column addressing for the full screen
• Setting the cursor based on the row and pixel (instead of column)
• Writing a single byte (8 vertical pixels) to the screen

The functions are available in the C library as well as the Python Module, and the command line oled-exp tool supports the new functions as well.
All of the info can be found here: https://wiki.onion.io/Tutorials/Libraries/OLED-Expansion-Library

1. there are typos in the wiki: the python method is not oledSetImageColumns() , it is just setImageColumns()

(one can check by doing a dir on the module)

1. more importantly, when I call setCursorByPixel(0,0) I get a seg fault.

Please fix these bugs ! I am writing a library to write scalable font to the display and need byte level writes to work.

Thanks,
P.K.

And I'll take a loot at the segfault tomorrow!

Can you run opkg list-installed | grep -i oled?
All of the versions should be 0.2-1

If that's the case, run the following:

opkg upgrade pyOledExp --force-depends

This will update the pyOledExp package and all of it's dependencies to the latest version. Try running your code again and let me know how it goes.

opkg upgrade libonionoledexp --force-depends

Here's my test program for those who are interested.

#!/usr/bin/python

import OmegaExpansion.oledExp as oled

oled.driverInit()
oled.setDisplayPower(1)
oled.setDisplayMode(0)
oled.setImageColumns()
oled.clear()

oled.setCursorByPixel(0, 0)

oled.writeByte(0x3C)
oled.writeByte(0x42)
oled.writeByte(0x89)
oled.writeByte(0xA1)
oled.writeByte(0xA1)
oled.writeByte(0x89)
oled.writeByte(0x42)
oled.writeByte(0x3C)

I'm ignoring the status return from writeByte (and probably a few other API's too). The output should be a tiny face on the OLED. I tried to do a smiley, but there wasn't enough space in an 8x8 block

Bryan.

libonionoledexp - 0.2-1
oled-exp - 0.1-1
pyOledExp - 0.2-1

oled-exp is still at 0.1.-1.

P.K.

opkg upgrade oled-exp --force-depends