Hi! Not sure how trivial my problem/question is (maybe this should be moved to “beginners”?). I would appreciate any help.
What I have is RPi4 (running Lite system and oF 0.11.2), one of the GPIO ports is connected to a currency validator (coin/token/bill acceptor). Once a valid coin is inserted, the device will send a 100ms signal.
For security reasons I need to make sure that the signal duration is with 10% tolerance (so it needs to be between 90ms and 110ms). Signal length 89ms and shorter or 111ms and longer should be detected as invalid. So I need a precise way to measure signal duration.
I assume I need to monitor GPIO ports outside the main ofApp::update() loop (which is 60fps/Hz). In a separate thread? Any help with measuring signal length at for example 250Hz?
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