PIC programming structure

[gg]

What are some different code structure that I can use?

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[Guest]

See
h t t p : // ai-depot.com/FiniteStateMachines/FSM-Framework.html
(remove the spaces, as guest I cannot post urls)

One possibility might be the state increments under interrupt, another might be the state just alters in normal program execution.
Basic answer however:
Define yourself some states, and depending on some event or result alter it. Then in a switch/case or if/else statement start/call another routine to handle that state.