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Thanks for your answer.
But Linuxcnc will coming up with an error:

 
 

hey scott, ive been playing with it for the last 2 weeks. I dont have much to show, but i think the environment switching is working kinda. im testing with a nucleoh743, from the debug it seems to be working but serial is messed, it seems i dont know how to do a define or something,

github.com/cakeslob/Remora-STM32H7xx-PIO...43/Src/main.cpp#L116

im not an expert but i think thats exactly what its supposed to look like (rpm changing as diameter changes). assuming those portions that are the straight lines are in between jog moves. I didnt see (or hear) any weird spindle speed drop outs like before thought. i am assuming you figured out the issue?

Thanks Tommy

I think this is exactly what I was looking for.

I'm trying to use ethercat so via the onboard ethernet port to the drives.
Honestly, just because its small and would fit easily in my electronics enclosure.

I'm willing to setup a pc but would be process be any easier?

Thanks

Press the machine on button 10 seconds before releasing E-stop.

Does not work, nothing will work while e-stop is active.
See timedelay:
linuxcnc.org/docs/2.9/html/man/man9/timedelay.9.html