Lost Step Counter

Hi I get nowher at this point. I spent 3 days on it...
I know a bit programing in C (arduino), but It's is to much to chew for me...
Python langage, HAL, linuxcnc structure ...
At this point I have a custom panel on the side of main screen.
I can display two interesting things:
for X axis for instance:

halui.axis.0.pos-commanded (which seems to reset to Zero when homing)
xpos-cmd (which seems to remain very absolute)

with this we can imagine a variable which make the difference and give the deviation
"deviation" = "X" - "absoluteX" - "previous deviation"
and a reset button to give to "previous deviation" variable the value of "deviation"

???!!!???? HELP

Have you managed to get the file that I gave you to load as a HAL module?

It won't display anything until it is connected up in HAL.

Hi,
I believe YES, I think a mistake in the copy/past in your post introduced a little mistake.
p1 = .......JOINT.pos-cmd right? (joint was missing)
now linuxCNC run, and I see this new pins in the HalMeter
nothing appears when I force a Home, and the halMeter remain at "0"
But I think it is an improvement yet
I start understanding how it works... maybe...

Do you have the HAL pins connected?

Sh...t I forgot this.
I was so happy to succeed running linuxcnc eventualy.
I do it right now

Now connected, I have your popup window working.
It show up asap I move the axis and just repeat the position.
Can you check the code and or the connection syntax?
But it's an improvement for my understanding of the system yet !
thank you