Python code to get Joint info

Hello All,

Maybe a dumb question and maybe this topic belongs somewhere else, burned a couple hours searching for a clue but I am having trouble connecting the dots on how to get access to this info in python, (QTDragon_handler.py).....

linuxcnc.org/docs/2.8/html/man/man9/motion.9.html

particularly the joint pins, I believe this is probably going to be "duh" moment once I get a clue.... A code snippet example would be great!

Thanks,
Kent

That's not much to go on actually

if you want to read HAL pins you can use the HAL python module

specifically:
value = hal.get_value("motion.motion-type")

If you want information about the running machine's configuration (from the INI)
INFO is for that.
If you want linuxcnc status reports STATUS is that.

Hope that helps - I can answer more specific questions.

Chris, as usual, your help is awesome.

So I posted the bigger pic over here:

forum.linuxcnc.org/38-general-linuxcnc-q...nd-new-home-position

So I really want a "verify position" function. I am trying to figure out a way to see if I missed any steps after an hour of hard work on the router. This would be a great diagnostic tool to help me track down my pesky Y axis issue. My machine was a badass when new in 1995 but is showing its age....

Specifically trying to read joint.N.pos−cmd. Not sure if this is going to work or not. if you have a better idea, please share.

Kent

If you override the limits and slowly jogged to the home switch at the same speed as home latch - it might give you an idea by looking at the readout.
How accurate would depend on the switch repeatability and how you set up homing (forward or backward latching)

Or add a temparay separate switch for the same thing.
The separate switch could be connected to motion.feed-inhibit to stop consistently.
compare before running program an after..

I would probably just use a magnetic backed dial placed somewhere convenient and touch off at zero on it (before and after) and compare the DRO..

Chris

So reading joint.N.pos−cmd before and after homing will not tell me anything?

Would I read it like this:

value = hal.get_value("joint.0.pos−cmd")

Specifically....

import hal
value = hal.get_value("joint.0.pos−cmd")

Checking before homing is not relevant IMHO, if it was consistent you wouldn't need to home at all.
To do a comparison you need a way to move the mill to a know position -without rehoming, because rehoming would reset the reference.

Yes that is the right code.

In qtdragon I believe the handler already imports HAL