Monday, May 21, 2012

An SSD1306 LCD controller in Perl for the BeagleBone

I've been hacking away on the BeagleBone some more, and I've come up with a controller for the common SSD1306 LCD controller, using the SPI interface. This controller is behind a bunch of the available small graphical LCD panels out there.

I've also written supporting libraries to display both text and PNG files, although don't expect too much from a 128x32 monochrome image!

I've uploaded my notes and libraries here:
https://github.com/TJC/BeagleBone

Coding it is as simple as:

my $lcd = BeagleBone::SSD1306::Text->new(
  rst_pin => 'P9_15',
  dc_pin => 'P9_16',
  # remainder of pins must be connected to SPI pins
);
$lcd->display_string("Hello world!");

5 comments:

  1. This is great! Your whole github repo looking like a great start to a bonescript alternative!

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  2. I hope you don't mind if I re post your blog =)

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  3. Sure, go ahead! :)

    It's not quite there yet -- I haven't imported the whole range of pin-to-gpio ranges yet, and there's no ADC or PWM support yet at all..
    But I'll get to those soon enough, and the digital GPIO is working nicely already.

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  4. awesome! is there plans for c/c++ and I2C support? i just got a beaglebone black and wanted to learn about I2C.

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  5. I haven't done much with i2c myself, sorry.
    I've written some support for the SSD1306 in C for a project, but I didn't build it into a library to be released. I'm sure there's already some stuff out there for C/C++ though, since that's the language used by Arduinos.

    It's worth noting that my perl library above was targetted for the original beaglebone pin-muxing, which doesn't work on the 3.8.x kernels used by the beaglebone black.

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