SKR PRO 1.2 TMC5160 X axis not working

[ggc-r]

Hello, I'm having issues with the build 20241006. I used the web builder to compile an image for the SKR PRO 1.2 board. When I tested the controller the X axis wasn't working. I had no issues with YZA axes. Next, I swapped the cables for the X and Y motors and now the Y motor did not work. This suggests that the X motor's cable is not at fault. Next, I tried swapping the motor driver with a known working one from Y axis to the X-axis and this also did not fix the issue. Then I tried resoldering the all the connectors in the X axis port in case I have a bad solder joint. Sadly this did not help. I ran M122 and I got OLA and OLB flags set on the not working X axis. I used a multimeter and I did not see an open load at the output of the motor. I also checked the power input to the TMC driver and did not see any issues. I also don't think it's an SPI communications problem as I'm not getting any errors related to that. Here is the output from M122 for a not working X and a working Y axis

M122 X [TRINAMIC] X Driver TMC5160 Set current 500 RMS current 490 Peak current 692 Run current 9/31 Hold current 4/31 Global scaler 133/256 CS actual 4/31 PWM scale 5 vsense N/A stealthChop false msteps 16 tstep 1048575 pwm threshold 0 [mm/s] 0 OT prewarn false OT prewarn has been triggered false off time 5 blank time 1 hysteresis -end 2 -start 6 Stallguard thrs 0 DRIVER STATUS: stallguard sg_result 0 fsactive stst olb ola * s2gb s2ga otpw ot STATUS REGISTERS: X = 0xE0:04:00:00 ok

M122 Y [TRINAMIC] Y Driver TMC5160 Set current 500 RMS current 490 Peak current 692 Run current 9/31 Hold current 4/31 Global scaler 133/256 CS actual 4/31 PWM scale 5 vsense N/A stealthChop false msteps 16 tstep 1048575 pwm threshold 0 [mm/s] 0 OT prewarn false OT prewarn has been triggered false off time 5 blank time 1 hysteresis -end 2 -start 6 Stallguard thrs 0 DRIVER STATUS: stallguard sg_result 0 fsactive stst * olb ola s2gb s2ga otpw ot STATUS REGISTERS: Y = 0x81:04:00:00 ok

Do you have any idea how should I proceed with finding the cause of the error?

[terjeio]

From the status report (ola, olb) it looks like the motor is not connected, but this is not a reliable way to determine that. When you try to move X is the motor engaged and cannot easily be turned? And if you command a X-move and send M122X while the move is ongoing is ola and olb still flagged with *?

[ggc-r]

I connected the X-axis motor to the Y-axis stepstick to test the electrical connection and the motor worked fine. I also moved a known working Step Stick to the X-axis, which did not help. The X-axis step stick also does not produce a holding current(motor does not hold the position). This is the output of M122 X when a move is ongoing.

M122 X [TRINAMIC] X Driver TMC5160 Set current 999 RMS current 990 Peak current 1400 Run current 19/31 Hold current 9/31 Global scaler 133/256 CS actual 19/31 PWM scale 26 vsense N/A stealthChop false msteps 16 tstep 806 pwm threshold 0 [mm/s] 0 OT prewarn false OT prewarn has been triggered false off time 5 blank time 1 hysteresis -end 2 -start 6 Stallguard thrs 0 DRIVER STATUS: stallguard sg_result 0 fsactive stst olb ola s2gb s2ga otpw ot STATUS REGISTERS: X = 0x60:13:00:00 ok

I am convinced that, the issue is either with the SKR PRO 1.2 PCB or the software. I tried using a multimeter on the outputs of the stepstick and the resistance of the motor phases was nominal. I think as a next step I will try to upload different releases of GRBLhal to check for software issues. I really don't want to pull out my logic analyzer just yet.

[terjeio]

What is your $4 (stepper enable invert) setting value? And can you check the enable signal on the X stepstick?

[ggc-r]

My $4 is set to 15

$4 $4=15 (Invert step enable pin, boolean) ok I measured the state on each driver enable pin, and the X-axis enable pin was high while others were held low.

[terjeio]

My bad - a recent typo/regression, sorry about that. Should be ok now, fix committed.

[ggc-r]

I just checked at the X-axis is working fine now. Thank you for your help.