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Y-axis Sensorless Homing is not working using FYSETC TMC2209 v3.1 on SKR 1.4

Posted by yasinzaii 
Y-axis Sensorless Homing is not working using FYSETC TMC2209 v3.1 on SKR 1.4
October 16, 2020 12:51AM
Sensorless Homing works perfectly fine for X-Axis, However, it's not working on Y-Axis. I checked the Endstop status using M119 command and Y is always showing triggered. When I give the homing command to Y-axis, it jerks towards the Y+ ( and moves like 5mm towards the y-max position)

I am using regular SKR 1.4 Board and (Not the turbo one)

-> I have used a jumper to connect the Y-Uart Pins as described in the SKR 1.4 board manual.

I am using Fystc TMC2209 v3.1

-> for both x and Y-axis

-> I have enabled sensorless homing in marlin

-> I am homing toward min position. (#define USE_YMIN_PLUG) (Y_HOME_DIR -1)

-> Endstop pull-ups has been enabled (#define ENDSTOPPULLUPS)

-> Endstop inverting has been set to false (Y_MIN_ENDSTOP_INVERTING false)

-> Homing Dir Inversion is false as described in multiple places on the internet (INVERT_Y_DIR false)

Things I did.

-> Reinstalled the latest version of the marlin and reconfigured it but didn't work.

-> Decreased the sensitivity of the Y-axis driver to 1 but still, endtsop status was still showing triggered and was not working.

-> Replaced the Y-axis driver with a new one but nothing happened.

-> Checked the voltage on the DIAG pin and it was High, (However it should be low as far as i know)

X-Axis works perfectly fine and homes correctly. But Y-Axis has this issue. Can someone please help me.
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