I2C LCD screen and Gentoo

destroyedlolo · Posted: Mon Dec 17, 2018 2:41 pm Post subject: I2C LCD screen and Gentoo

Hello,

I bought tiny I2C LCD screens and I would like to use one of them on my BananaPI under Gentoo.
Only references I found is about AdaFruit's python library, but I would like to know if there is a library for C ?
Or ... but I think I'm dreaming, a way to use it as a framebuffer.

Thanks for your idea

Laurent

destroyedlolo · Posted: Sat Dec 22, 2018 8:48 pm Post subject:

Well, I found this library : https://github.com/jonesman/ArduiPi_OLED

Unfortunately, it doesn't work for me : write error when I'm running the demo.
In addition, I2C target is hard coded so not so good.

I think I'll write mine ...

destroyedlolo · Posted: Sun Dec 23, 2018 1:21 pm Post subject:

Well, I corrected the compilation issue and it's working pretty well on my BananaPI.
Obviously , it's quite slow, something like 2 FPS, due to the I2C speed.

Next to steps :

strong clean-up (i.e: complete rewrite) of the compilation chain,
platform agnostic : for the moment, there are really un-needed Rasberry / BananaPI references
API cleaning
eventually, integration in my own Selene framework to make dashboard creation easier

Anyway, the screen, even very tiny, is clear and readable. Perfect for a simple dashboard on an headless system (like my basement bPI that manage my smart home).

Bye

destroyedlolo · Posted: Thu Dec 27, 2018 10:57 pm Post subject:

Even if I continue with the library above, I discovered 2 kernel modules that can handle these displays :

one for 1307 but compatible with 1306 seems available for 4.x kernel
unfortunately, my BananaPI are stick with the old 3.4 kernel (due to some devices for which I don't have DTS) : there is a 1306 driver in staging but seems for SPI only.