TommyBoy,
Two answers: Yes and No.
Yes: Requires another hw counter. Configure another counter for edge counting and count the # of pulses made by your pulse train.
No: If no hw counter is available. The software calculation you mentioned is probably your best bet for a decent estimate. Other methods (polling DIO bit or counter output state property) would accumulate error when pulses are missed. The calculation would have a fixed uncertainty that wouldn't grow with time.
-Kevin P.
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