The HAL pins you need are part of "motion"
linuxcnc.org/docs/2.7/html/man/man9/motion.9.html
For a shared encoder you would use one mpg connected to both axes and a select.
Code:
net mpg-counts encoder.0.counts # as an example. Or hm2_7i84.0004.mpg1.counts, as another
net x-jog-sel parport.0.pin-01-in
net z-jog-sel parport.0.pin-01-in-not # only one pin, but using the complementaty outputs
...
net mpg-counts axis.0.jog-counts axis.2.jog-counts # connect the mpg to both axes
net x-jog-sel axis.0.jog-enable
net z-jog-sel axis.2.jog-enable
It is actually simpler with one wheel per axis.
Code:
net mpg-x encoder.0.counts
net mpg-z encoder.1.counts
...
net mpg-x axis.0.jog-counts
net mpg-z axis.2.jog-counts
setp axis.0.jog-enable 1
setp axis.2.jog-enable 1 # no need for a select pin
The scaling can be done a number of ways. It is often easier to get it out of the GUI. For example with the Touchy GUI is it
Code:
net jog-increment touchy.jog.wheel.increment axis.0.jog-scale axis.2.jog-scale
The corresponding pin in the Axis ui is axisui.jog.increment.
If you prefer to select jog-speed with a physical switch then the mux components can be handy
linuxcnc.org/docs/2.7/html/man/man9/mux4.9.html
