https://www.adafruit.com/product/420
- use a guide from here https://opencoursehub.cs.sfu.ca/bfraser/grav-cms/cmpt433/links to figure out where to plug in the cables
- run
make test_ledMatrix2
- The ledMatrix test file is broken in how it exports things
- If the led matrix not attached to power, but attached to the bbg, it will stop the bbg from booting. You must plug in the led matrix before booting the bbg (I suspect this is some form of short circuiting. Not good!)
- The display will flicker. In order to remove this (from context switches in linux), we need to drive the gpio from the PRU. (TODO: later)
- NOTE: don't run
test_ledMatrix, it sucks