Additional content - snake game

[bunburya]

After reading through the book I wrote a simple snake game to apply some of the concepts covered. This also involved dealing with the button peripherals, interrupts and the non-blocking display. I was considering doing a short write-up of the process and figured where better to put it than in the book itself, either as a new chapter or an appendix or something.

Would there be any interest in this? If so I can work on a PR. The code is at https://github.com/bunburya/snakebit - it is only written to work on the v2 (because that's all I have).

[eldruin]

Nice work! The code seems pretty clear.
I think it would fit here either as a chapter after punch-o-meter or as an appendix.
Something similar to the LED compass chapter would be great, with emphasis on the hardware interface and including a general game (loop) design overview.
It would be ideal if it was ported to the V1 as well but we can add a disclaimer and ask for contributions porting it otherwise.