Ah.
https://github.com/LinuxCNC/linuxcnc/blob/master/src/emc/usr_intf/emcrsh.cc
It uses sockets in that file which implies this is how communications is done.
But as usual, the code is quite vague. For example there's this function.
static cmdResponseType setSpindle(char *s, connectionRecType *context) {
And inside the function
switch (checkSpindleStr(s)) {
case -1: return rtStandardError;
case 0: sendSpindleForward(spindle); break;
and a few more cases.
So where is sendSpindleForward(spindle) ?
Is there a way to search for "sendSpindleForward" to find out if it's a MACRO
or a function that formats the message to go to the socket?
Thanks
John
> -----Original Message-----
> From: Frank Tkalcevic [mailto:[email protected]]
> Sent: December-15-20 9:48 PM
> To: 'Enhanced Machine Controller (EMC)'
> Subject: Re: [Emc-users] Python question
>
> 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:[email protected]]
> 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:[email protected]]
> > 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, <[email protected]> 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
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/emc-users
>
>
>
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