Added support for KY-040 rotary encoder #143
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…ect buttons; all code changes were annotated with //ROTARY: for easy review;
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I added a simple decoder class and some supporting logic to allow the use of a KY-040 Rotary Encoder in place of the Up/Down/Enter buttons. All code edits were marked //ROTARY: for easy review. The decoder class operation and implementation details are documented in the header file (dmRotary.h). The encoder can be enabled from the options.txt. A brief video of the encoder being demonstrated is available on YouTube at https://youtu.be/c83Rn3KvZ0g.
Disclaimer: This implementaton is working for me - but I'm no expert on RPi bare metal programming. Also, this code has only been tested on a RPi 3 and may or may not work on earlier models.