To set the length, change the `LENGTH` constant. To change the speed of the animation, change the `F_SYSTICK` constant. To change the length of one iteration of the rainbow, set the `INCREMENT` constant. To change the maximum brightness, change the `PIXDATA_MAX` constant while making sure that it is a multiple of `INCREMENT`.
This work is released under the Mozilla Public License (MPL) Version 2. It may be interpreted in the same way the Open Hardware Description License (OHDL) by Julius Baxter does. Read more about it here: http://juliusbaxter.net/ohdl/ohdl.txt