z probe is triggered but homing crashes head into plate

hello

my configuration is a Ender 3 with SKR1.4 mainboard and Marlin 2.0.7.2 and TMC2130 stepper drivers

seem unable to get the z-axis to home properly. Wanted to use the stall detection of the tmc2130 also for z-homing. For x and y homing it works as a charm. This did not work. I don't know why (have tried to up the speed of homing and changing the sensitivity settings). Then I tried a mechanical switch. Using M119 I can see that the switch gets triggered when I expect it too. Alas the homing still does not work.

What am I missing?

thanks.

you cant get good enough detection of stalling with threaded rod or most lead screws

ok, thank you,

but that still does not explain why the mechanical switch does not trigger during the homing procedure while it is triggering according to M119?

If you have a end stop switch installed and you must remove the diag pin on the stepper driver or it interferes

thank you, read about this but only in combination with other boards and steppers.

tried it now, did not work. (I had a spare where the 3(?) diag pins were not connected to start with, Vref, Diag0 and Diag1 according to [learn.watterott.com])

did not expect it to work since the M119 command sees when the switch is closed so I expect this to happen during homing too so both hardware and (at least part of ) the software are capable of handling this information.

I still think I am missing a switch in Marlin but do not know which one