The kinX project is described in a series of blog posts:
While not strictly a part of this series, “Hacking your own Kinesis keyboard controller” describes the first controller I built in 2013 (maybe interesting for context).
The first post introduces the kinX, a keyboard controller with merely 0.2ms of input latency (including USB).
The second post motivates and describes building a drop-in replacement USB hub for the Kinesis Advantage keyboard.
The last post introduces the processing latency measurement firmware for the FRDM-K66F development board and draws a conclusion.
You can find the project’s artifacts at https://github.com/kinx-project.