Flow-control statements in streamed G-code

[raoullector]

Hi everyone,

Without having to write a macro, I’d like to be able to check some basic conditions directly in my programs.
For example, before moving the Z axis, I’d like to make sure the probe hasn’t been triggered — and if it has, pause the program.

I was thinking of something as simple as:

...  
Start of G-code program  
...  
if [#<_probe_state> EQ 1]  
(print, Warning: tool in contact)  
M0  
endif  
...  
Rest of the G-code program  
...  

But this doesn’t seem to work. I’ve enabled support for “RS274 NGC expressions,” and both the docs and the source make me think flow-control statements like if / else / endif should be valid in streamed G-code.

What am I missing here?

[terjeio]

Which sender? It could be that it does not send the commands to the controller?
And at least you have to put o-labels on statements:

o100 if [#<_probe_state> EQ 1]  
(print, Warning: tool in contact)  
M0  
o100 endif  

[raoullector]

Thanks for the answer!
I had misread the documentation and hadn’t inserted an o-label before the statements... It’s working now.

Just one question by the way: is there somewhere a state variable that makes it possible to know whether the GrblHAL interpreter is currently executing a flow control block?

[terjeio]

It depends, the _call_level named parameter may. If part of the main gcode (not in a subroutine) then no.

[raoullector]

Ok, thank you !