If you look at the axis source code, to increment the spindle you call... c.spindle(linuxcnc.SPINDLE_INCREASE)
where c = linuxcnc.command() linuxcnc.command() comes from halui.cc (I think), which sends a message... static int sendSpindleIncrease(int spindle) { EMC_SPINDLE_INCREASE emc_spindle_increase_msg; emc_spindle_increase_msg.spindle = spindle; return emcCommandSend(emc_spindle_increase_msg); } So, to invoke an action, you are actually sending a message to linuxcnc, not just settings a pin. Status information, like spindle speed, for example, come from the status message, which is also exposed via halui for python. There are examples, like linuxcnc/src/emc/usr_intf/emcrsh.cc, which do this in C++. -----Original Message----- From: John Dammeyer [mailto:jo...@autoartisans.com] Sent: Wednesday, 16 December 2020 3:59 PM To: 'Enhanced Machine Controller (EMC)' Subject: Re: [Emc-users] Python question Let's say you wanted to access the hal pins and essentially run the machine using a different programming language like C instead of python. How's the linkage done from say the Axis GUI to the rest of the system? Like Spindle ON button and then Spindle + John > -----Original Message----- > From: andy pugh [mailto:bodge...@gmail.com] > Sent: December-15-20 5:15 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Python question > > On Wed, 16 Dec 2020 at 01:10, <ken.stra...@gmail.com> wrote: > > > > Are the necessary environment variables document somewhere? > > I think you just need to "import linuxcnc" to get access to linuxcnc > command and state. > > But you would probably still need to create and net hal pins to get > values from hal. > > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is > designed for the especial use of mechanical geniuses, daredevils and > lunatics." > ? George Fitch, Atlanta Constitution Newspaper, 1912 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users