Hi,

I'm using a brand new BBB running Debian, and I'm trying to initialise the display thus:

disp = SSD1306::Display.new protocol: :i2c, path: '/dev/i2c-1', address: 0x7B
Errno::EBUSY: Device or resource busy @ rb_io_syswrite - /dev/i2c-1

The address I've got from the back of the OLED, it's one of two options (the other being 0x7A) and this one is jumper-set.

I don't know how to check the device tree, but this is the first I2C connection I'm making on this new board, so I wouldn't think it's already used by something else?

Running this on my raspberry pi with ruby 2.1.5p273 and the gems:
i2c (0.4.0)
rmagick (2.15.4)
SSD1306 (0.5.1)

Fails at runtime on line 1.

/usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in 'require': cannot load such file --``SSD1306 (LoadError)
from /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in 'require'
from displaytest.rb:1:in <main>

Hello,
I use 128x32 on Raspberry Pi , i get this error:

var/lib/gems/2.1.0/gems/SSD1306-0.6.1/lib/SSD1306/display.rb:144:in pack': no implicit conversion of nil into Integer (TypeError) from /var/lib/gems/2.1.0/gems/SSD1306-0.6.1/lib/SSD1306/display.rb:144:in display!'

I install without any error

gem install SSD1306

Fetching: SSD1306-0.6.1.gem (100%)
Successfully installed SSD1306-0.6.1
Parsing documentation for SSD1306-0.6.1
Installing ri documentation for SSD1306-0.6.1
Done installing documentation for SSD1306 after 17 seconds
1 gem installed

Any chance you could fork this project to use a more lightweight library than imagemagick via rmagick? It's just that imagemagick and libmagickwand-dev are a thousand times bigger than this actual gem. Lots of precious storage for what might perhaps be achieved using simpler packages. I don't need a million fonts and ghostscript and tiff support and exif and the whole of libcairo2 and and and...

I'd even take a version that's fed "hardcoded" bitmaps which I would pre-produce separately...