Linuxcnc equivalent of UCCNC macros, macroloops, plugins

Thanks Andy.

This part of Linuxcnc is rather hard to find information on. Youtube comes up with very little results and in general trying to find out how to get from A (when you know where A starts) to B is very frustrating.

Perhaps half the problem is knowing exactly where to look.
I'm guessing in time, as I keep reading and searching, it will all start coming together.

Starting to make a bit of headway with Python scripting.

I now know how to use Python to query Linuxcnc status. However, I'm pulling my hair out trying to find documentation that explains the returned results.
One of the results I can get is the current state of the digital input and output pins.

In Axis you can also get the Linuxcnc status by going to the Machine menu and clicking on "Show Linuxcnc Status".
You'll see in the pop-up box there are results for "din" and "dout" which are the digital input pins and digital output pins. However the results for each are 64 boolean True/False values.
At present that is absolutely meaningless as I have no idea what each boolean value refers to.
When I did scripting in UCCNC such results were given by port and pin number for example, so you knew exactly what value for what pin.

Can anyone explain these status results from Linuxcnc.

That gives you a python tuple (a specific python type of list) of the (default number of) 64 integer values.
To just get a specific integer use this:


Gstat is a useful library for working with linuxcnc in python
(not sure what version of linuxcnc you are using.)

linuxcnc.org/docs/devel/html/gui/gstat.html

andypugh wrote:

I think that the results you see in LinuxCNC status are the G-code digital inputs and outputs. ie the values of motion.digital-in/out-NN which are controlled by the M65 command (and friends)

If you want the value of an actual physical IO then you need to look at the value of the corresponding HAL pin.

import hal
v = hal.get_value("hm2_7i76E.0.input-00")


For example.

https://linuxcnc.org/docs/stable/html/hal/halmodule.html

There is also a way to trigger a callback on a HAL pin value change, though that is a little more involved.

 

Thanks Andy,

that's great info. So it looks like it's a mixture of Python and Hal for that sort of stuff.

cmorley wrote:

import linuxcnc
s = linuxcnc.stat()
s.poll()
analogin =  s.ain


That gives you a python tuple (a specific python type of list) of the (default number of) 64 integer values.
To just get a specific integer use this:



[code]# used with code above.
analogin0 = analogin[0]
analogin1 = analogin[1]
# etc


Gstat is a useful library for working with linuxcnc in python
(not sure what version of linuxcnc you are using.)

http://linuxcnc.org/docs/devel/html/gui/gstat.html

[/code]

Thanks Cmorley,

I knew how to do the first part of the code but wasn't up to the second bit you showed me, where you get individual values from the tuple, so that's useful.
Problem is I wouldn't know what the analogue value referred to. In Andy's example it states the input I'm reading is input number 0, on 7i76E, board number 0.
So at present the Linuxcnc Status values such as "ain", "din", "dout", etc are a complete mystery to me.

Thanks for the info and link to Gstat too.

They are from motion:
linuxcnc.org/docs/devel/html/man/man9/motion.9.html

 

Cheers Phill. The rabbit hole deepens LOL.