[RESOLVED] TMC2209 Sensorless Homing problem

[joshua76y]

When I ues TMC2209 drivers and set to UART mode, I can't home either X or Y and I tried the sensitivity from 1 to 254, they didn't wrok.
But I change to the 2130 drivers and set the jumper to SPI mode, they can easily stop at the end of the axis and the sensitivity is both 3.
Of cause every change I haved complied the new drivers setting of the AIO firmware and my control board is BTT SKR 1.4. How could this be？

[thisiskeithb]

How could this be?

I’m not sure since I tested 2209s on an SKR 1.4 and they worked.

Can you create a Bug Report?

[joshua76y]

They works no errors but when they home X or Y, just move a little bit and stop. Seems like too many resistance, I have try many sensitivity and did't work. Use the menu to move XY and they can move smoothly. I have set the jumper to UART mode and cut the diagnostic pin.

[thisiskeithb]

You need the diag pins on X and Y or sensorless homing won’t work.

[joshua76y]

I need the filament sensor，so can I just cut the diagnostic pin of the extruded stepper and keep the XYZ stepper's diagnostic pin? I used to cut all the diagnostic pins.

[thisiskeithb]

Diag pins only need to be removed on E and both Z drivers since the SKR 1.4 doesn’t have Diag jumpers.

Keep diag pins on X and Y since the MK3 uses sensorless homing and won’t home without them.

[joshua76y]

Ok, got it. I'll will it tomorrow. Thx