Can you cause the issue if you steadily move in one direction, or only with back-and-forth movement?
I can cause the issue if I move really fast in one direction (ie more than 5 revolutions per second)
Does the issue go away if you go slower?
Yes, I do not have the issue if I go slower.
One thing to try is to enable Counter0 and connect one of the quadrature phases to that at the same time. It will report the total number of edges it sees, and is handled purely in hardware so does not affect the quadrature timer input performance.
I had done the following test:
- enable Counter0 and connect it to the A track
The counter does not lost edges and it seems normal as the Labjack support Counter at 3Mhz.
Yes, I agree with your map. If you are not streaming, and the only timers you are using is the 1 pair for this quadrature input, then it should be good up to 5 revolutions/second.
Ok thanks. Do you have any plan to create a Labjack which supports higher frequencies for quadrature mode?