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Designing and writing explicit state machines. They seem to come up more in low-level code than high-level code.

I prefer to generate them, so I would add to that "tools for generating C code and state machines".

(Tangent: A guy who worked on Verilog and FPGAs told me that the "whole idea" is state machines... and they are hard to get right.)

There is a C framework based in state machine: https://bitbucket.org/yuneta/

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