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[Others] How to quickly reading GPIO pin LOW/HIGH directly?

I'm expecting to see the state of a pin that I'm reading to pull low for maybe 50 us and then back up to high. The original code running on an UNO/Nano code looks about like this:while ((...
Ranking Name Answers
1 PCBWay Team 6
2 sisma ‎ 1
3 Tormy Van Cool 1
4 Julian Phillips 1