Do I need to make a custom function?

Hello all, I have a question regarding setting the G54 offset of an axis to 0. So I just designed this handwheel and I included a button that was intended to set the G54 offset to zero based on the selected axis on the handwheel. I pinned it out so that there could be 3 separate inputs on my parallel port. One for each axis.
Basically I'm wondering if I can connect my parallel port pins to what I presume is purely and AxisUI function. Is this at all possible? Maybe a brutally simply way since I don't know any languages other than C?
(I'm very new to the community and linuxcnc in general)

Thanks,

You might want to look here...
wiki.linuxcnc.org/cgi-bin/wiki.pl?Adding_Custom_MDI_Buttons
In that example a button is used to execute a MDI command. In your case try using the parallel port input pin instead of the pyPVC panel button for the input.

Your MDI command could use G10 L20
linuxcnc.org/docs/html/gcode/g-code.html#gcode:g10-l20

As shown in a more complex example using the simple remote pendant...
wiki.linuxcnc.org/cgi-bin/wiki.pl?Adding...imple_Remote_Pendant

Rick G

Yup thanks guys! I ended up using the [HALUI]MDI_COMMAND suggested above. used G92 X0, G92 Y0, G90 Z0 connected to 3 parport pins. Works like a charm.


Rick, What does the "P1" argument do in that gcode string? Is there any advantage of this over using G92?
Also that last link sheds some light on the complexity that can be achieved! I may have to cook up a new circuit! My current circuit is just a micro that handles the axis/speed, can send a homing signal (now at least) and has a quadrature encoder for the MPG inputs. Milled the pendant itself out of Renboard. Designed in Powershape