Get current state of LinuxCNC trough HAL/Python

Hi everyone,

I need to check the current state of LinuxCNC trough a HAL pin which will trigger a Python script. This is necessary since I need to execute a command before LinuxCNC exits.

Can somebody help me with that? I don't know how I can check trough HAL if the user close LinuxCNC.

Regards,
Dylan

What state of linuxcnc are you interested in?
How will you launch the script?
A python program can poll alot of info from linuxcnc.
www.linuxcnc.org/docs/2.6/html/common/python-interface.html

@phillc54
I tried to use the HAL shutdown file but the command doesn't come trough.
LinuxCNC communicates with an Arduino (serial) trough Python, in the shutdown HAL file I put a parameter. The Python script reads the parameter each time.
However, I think the Python script is closed first before the LinuxCNC executes the shutdown HAL file. I tried to make a second Python script which will be called only when LinuxCNC shutdown but that doesn't work either.

@cmorley
I need to know when a user closes LinuxCNC so that I can execute a command to the Arduino (serial).

Dylan

You could use gladevcp with a python handler file - I believe the manual on gladeVCP talks about catching linuxcnc closing.

You could use a python 'user HAL component' to do nothing but wait for an exception (HAL closing).
The exception code could do what you want.

Hope that helps

Chris M

Then I need to convert my PyVCP to GladeVCP.
I read somewhere I can add a keyboard hotkey to a GladeVCP button also that's the second thing I was looking for

Dylan

I tried that but the Arduino just does nothing.
I also tried with a HAL pin that waits until it's activated by shutdown.hal by:

which also does nothing.

Dylan

Sorry I was on vacation, I will try it today and let you know.

Dylan