"performance of a switch-case compared to an IF statement?" You have to see how the compiler built the switch statement, it could be a sorted table, it could be sequectials, it could be just a bunch of ifs. if you have a few or alot of things, "if" can be prioritized how you want them. the switch case will be redone by the compiler and put into different orders than you have in the switch statement.
FSMs and Petri-Nets are great abstractions for logic/sequential machinery, which most control/reactive systems are. There are some automatic code generation tools out there. IAR Visual State does a pretty good job.
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When cases for a switch statement are contiguous (like the state machine IDs # define, or I like to use enums) many C compilers convert it to a quick vectored lookup table branch, like pointers usage and therefore same time regardless of state. This keeps the debuggable/readable single-steppable switch/case form and yet runs efficiently. Only a crude C compiler would implement it as series of chained if/then/elseif/else decision forks. That's why I usually use an enumeration for state ID codes so they are sequentially assigned.
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I'm doing a similar project at the moment but slightly more complicated.
It has 16x2 HD44780 LCD, 16 key matrix keypad, RTC chip DS1307 to display time and date, a solenoid valve to turn water on or off and a flow meter to measure quantity of water flow and a serial printer to print report.
Need to be able to adjust time and enter qty of water to pass, display both final and instantaneous water flow on LCD as well as date and time. I have finished the hardware using PIC16F876A and in the middle of software. I'm doing it using state machines while counting flow meter pulses through 16 bit timer1 as a counter with external clock.
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