halcmd in pyVCP

hello,

I have a question:
can I submit halcmds (like unlinkp, linksp) in a pyVCP ?
can I do this in a user space component ?

thanks, Gerd

no to pyvcp.
I believe yes in a component as you can include HAL's API and program in C.
What are you trying to do?

I want to rewire the step/dir signals to swap motors.

you could use tristae buffers controlled by a pyvcp button:
www.linuxcnc.org/docs/2.4/html/man/man9/tristate_bit.9.html
or create a component that does the same thing. (more compactly)
The idea is to steer (using the tristate buffer) the step and direction pins to 'A' motor or 'B' motor

yes, this would be another solution, a kind of digital multiplexer with existing hal rt components, or my own one.
I thought about this also, but the "rewire" solution was easier to implement as a 1st step.
The hal scripts are very simple, and work perfect.
The only disadvantage is now, I have to start the scripts somehow, either by terminal or by another simple GUI.
So its not integrated in EMC.
Maybe I will start working on the mux. Another advantage of the mux would be, it can be interlocked by machine off or e-stop.

What is the real time performance of this kind of hal comps ? It must run with base period, because it has to switch step signals.

thanks so far

Gerd

realtime comps run just like any other realtime program.
There is no difference in performance.

I looked at the tri-state. Seems to be an efficient way to implement the mux.
Will try it.