Ways to get an user M code return value
07 Nov 2023 07:56 #284750
by jogger
Ways to get an user M code return value was created by jogger
Hi!
I have read some statements that there is currently no direct way to get a return value of my user defined M function back to the G code. My questions:
1.) Is there a way to set parameters (like #4999) directly in the M code?
2.) One working way is to set HAL pins/parameters via "halcmd" and then read them out in the G code.
Is there a (very simple) hal module which only offers some parameters to be used as a "clipboard" between M code and G code?
As I understood HAL there is no function needed for updating something because there are no inputs and outputs needed, just parameters. Before I write such a module - has it already been written?
Best regards,
Chris
I have read some statements that there is currently no direct way to get a return value of my user defined M function back to the G code. My questions:
1.) Is there a way to set parameters (like #4999) directly in the M code?
2.) One working way is to set HAL pins/parameters via "halcmd" and then read them out in the G code.
Is there a (very simple) hal module which only offers some parameters to be used as a "clipboard" between M code and G code?
As I understood HAL there is no function needed for updating something because there are no inputs and outputs needed, just parameters. Before I write such a module - has it already been written?
Best regards,
Chris
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07 Nov 2023 17:07 #284799
by Aciera
Replied by Aciera on topic Ways to get an user M code return value
I would use a python remap.
Create a file 'remap.py':
mark the file as executable and place it in a folder 'python' in your machine config
then add this to the [RS274NGC] section in your ini file:
In your gcode you should then be able to do something like:
which should move the x axis to 4
Create a file 'remap.py':
def m444(self, **words):
c = self.blocks[self.remap_level]
# parse the i-argument
i = c.i_number if c.i_flag else 0
self.params[4999]=imark the file as executable and place it in a folder 'python' in your machine config
then add this to the [RS274NGC] section in your ini file:
SUBROUTINE_PATH = ./remap_subs
REMAP = M444 modalgroup=10 argspec=i python=m444In your gcode you should then be able to do something like:
m444 i4
g0 x#4999which should move the x axis to 4
The following user(s) said Thank You: jogger
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08 Nov 2023 11:13 #284855
by jogger
Replied by jogger on topic Ways to get an user M code return value
Ahh, perfect 
Thank you very much!
Thank you very much!
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09 Nov 2023 19:26 #284960
by Joco
Replied by Joco on topic Ways to get an user M code return value
I would be interested to know experiences here in WHEN the remapped m word is executed. I did this (M259) to run some halcmd lines to set pins in hal and found that this was being executed as soon as the programe was parsed and then again when it was run. But NOT when the line was encountered in the correct order in the program. I could solve for preventing the parsing issue but could not find a way to get things to only happen at the correct point in the program run.
The only way I could solve this was to use the M100-M199 range of pre configured user available words. These behave correctly in that sense. i.e. trigger only when encountered in the program execution. I can't remember if they also prevent parsing execution, I already had the code to prevent that baked in.
So ... interested in your findings.
Cheers - J.
NB: using 2.9 debian install of linuxcnc.
The only way I could solve this was to use the M100-M199 range of pre configured user available words. These behave correctly in that sense. i.e. trigger only when encountered in the program execution. I can't remember if they also prevent parsing execution, I already had the code to prevent that baked in.
So ... interested in your findings.
Cheers - J.
NB: using 2.9 debian install of linuxcnc.
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