I am wondering, have anyone tested max speed for a polled program
decoding an rotary encoder ? Would an interrupt driven program
do better ?

PIC16F877 @ 20 MHz. Approx 50 instuctions in the active loop
Encoder is 100 pulses/rotation, quadrature decoding (400 flanks/rotation)
I have reached around 2000-2500 rpm. 3000 rpm gives overspeed error.

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