_____
         ___
          _          _             _     _ _
      _________     | |    ___  __| | __| (_) ___   -x--x--x--x--x--x--x-.
     /......,--.    | |   / _ \/ _` |/ _` | |/ _ \  ,x--x--x--x--x--x--x-'
    /.....././  \   | |__|  __/ (_| | (_| | |  __/  `x--x--x--x--x--x--x-.
   /________/    \  |_____\___|\__,_|\__,_|_|\___|  ,x--x--x--x--x--x--x-'
                  \________________________________/

                 SIMPLE & FAST LED WINDOW CONTROLLER

--------------------------------------------------------------------------------

I have an array of 15 by 10 leds on my window with approx. 10cm between each
led. My goal is to make an interactive display out of these which passerby's can
interact with through a website.

I'm driving this LED window from a Raspberry Pi B+. Luckily there is a library
which can run drive this many LEDs quite easily and efficiently:
rs_w281x. However, it requires root access to use the PWM module.

It is of course not wise to run a web server as root. Furthermore, I noticed
that the library was not very fast in python. Therefore, I decided to write a
small daemon that could control the LEDs based on a few commands over a named
pipe. Since this could be a much smaller project, the attack surface is
reduced. I choose to write this program in Rust because of the memory safety
guarantees this provides (although I do use an unsafe block to create the named
pipe).

I call this controller Leddie. It currently accepts two commands on the named
pipe "/tmp/leddie":

- set_pixel: start with a byte 0, then 5 bytes for x, y, r, g and b.
- render: a single byte 2
- set_brightnes: start with a byte 3, then a byte for the brightness

This project is licensed under the AGPL version 3 or (at your option) any later
version. See the file COPYING for more information.