n this part, we will build a basic finite state machine that has the following structure:

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What this diagram shows is a simple FSM that has the following algorithm:

$$ When button $1$ is pressed

o If in State A$,$ transition to State B

o If in State B$,$ transition to State C

o If in State C$,$ transition to State A

$$ When button $2$ is pressed

o If in State A$,$ transition to State C

o If in State B$,$ transition to State A

o If in State C$,$ transition to State B

This can be easily accomplished using $2$ interrupts.