Using StallGuard2 when motion ramps up or down

Hi, unfortunately, StallGuard only works in a limited velocity range, as it requires the motor Back-EMF. To ensure that the velocity range is good, tune StallGuard for the motion velocity, and set TCOOLTHRS to match a velocity slightly lower than this. With this, StallGuard automatically disables while starting up and slowing down. Monitoring the acceleration and deceleration period is not possible with the automatic stall detection. What you could do instead: Use your CPU to trace the SG-Value or the complete motion. Do a pattern matching to check if it behaves normally. A stall will lead to a high ripple or deviation in the values. 

Thanks Bernhard.
This is now working in my test, but you have to set the values very tightly. I will have to see if this is practical in the application. Otherwise I will have to look at your alternative suggestion.

Is there anything specific you have to do for the negative velocity case?

In the reverse direction I can't seem to find a balance of values that work like it does in the positive/forward direction.
I'm at 330 rpm and the sgt is not very effective at that speed it seems. It is difficult to get a good range of SG_RESULT.

No. Just be sure to use microstepping >16 times (default 256 is best). Asymmetries can be from mechanics or motor. Probably the velocity is very low, then results vary a lot.

Thanks for the input.
Would you regard 330rpm as low speed in this case?

No. For Nema 17, a typical velocity range is 1 to a few RPS for best StallGuard results.