Question: I need to make a stopwatch using private timer ARM A9. I managed to do the stopwatch itself, however, I don't know how to start,

I need to make a stopwatch using private timer ARM A9. I managed to do the stopwatch itself, however, I don't know how to start, stop and reset it using KEY buttons.

(The code is written in C and the microcontroller is DE1-SoC)

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