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
>
>
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