Advanced Search

I didn't fully understand it, but I've already tested your update, everything works fine.

 

That would work.. I pushed something similar before your post.

I wonder, is there a Raspberry HAT that can direct interface with a stepper driver ?

Thanks
Jonh.

I'm using a Raspberry Pi 4 to drive a Mesa 7i96.   For unknown (as yet) reasons, I can't reliably run without errors unless I bump SERVO_PERIOD to 2000000 (i.e., 2ms).

What affect will this have on machine operation?  I sort of understand what's scheduled to run in the base thread, which of course is largely (completely?) irrelevant now that I have the Mesa.  But I don't have a good mental model for what runs in the servo thread, so I don't have a good understanding of what happens to operation/performance if it only runs half as often as usual.  Where would the difference show up?

Until recently my mill maxed out at about 40ipm, so absolute performance wasn't really a consideration.  I've upgraded to a machine capable of at least 80ipm using Grbl, and initial tests with LinuxCNC and the Mesa card indicate 100ipm may be fine.  So now I'm wondering if I need to start worrying more about that servo thread.

paul