how to make M7 (mist on) generate step pulses

Thank you for your continued support Andy,
Success !!!!!!!!!!!!!
I had given up hope of doing this with software due to my limited software abilities.
However, adding the steplen and stepspace parameters fixed it.
Now I can run my peristaltic mist pump at a predefined speed at the press of the coolant mist button or M7 command.

My HALnow includes:
loadrt stepgen step_ type=0,0,0,0,0 ctrl_type=p,p,p,p,v
setp stepgen.4.velocity-cmd 20
setp stepgen.4.steplen 1
setp stepgen.4.stepspace 1
net pump-on iocontrol.0.coolant-mist => stepgen.4.enable
net pump-pulse stepgen.4.step parport.0.pin-14-out

Happy happy happy
Thanks again

Mike

Interesting !

My HAL was created automatically by stepconfig.

The four linear mation axes all have steplen 1 and.stepspace 1. I simply copied that to stepgen .4.

I cannot see anything obvious to set the paraport reset time, it appears to be locked to the base period, However, all the axes have dirhold 2750 and dirsetup 2750. Could this be setting the pulse durations?

Mike

Now I can run my peristaltic mist pump at a predefined speed at the press of the coolant mist button or M7 command.

My HALnow includes:
loadrt stepgen step_ type=0,0,0,0,0 ctrl_type=p,p,p,p,v
setp stepgen.4.velocity-cmd 20
setp stepgen.4.steplen 1
setp stepgen.4.stepspace 1
net pump-on iocontrol.0.coolant-mist => stepgen.4.enable
net pump-pulse stepgen.4.step parport.0.pin-14-out

I have been running this HAL code since 2021. It works reliably but these is only one stepper speed available i.e. setp stepgen.4.velocity-cmd 20. If I wish to change the stepper/peristaltic pump speed, I need to edit the HAL file and re start.

Is there a way to add a control to the AXIS control screen or add a pot or encoder the the parport pins which will allow me to change the stepgen speed (velocity-cmd 20) in the HAL file during a machining session.

Maybe I should be asking a different question.

If I were to change the "setp stepgen.4.velocity-cmd 20" line in my HAL file, while AXIS was running; would it make any difference?

Is the HAL file used while the AXIS CNC program is running OR is it only used to set up the machine during start up?
What are your thoughts?

Thanks  

Mike
 

You can set do 'setp' command while linuxcnc is running via halcmd i think.
open a terminal and write halcmd -k (double check this syntax)

linuxcnc.org/docs/html/man/man1/halcmd.1.html

I think you can set set via bash commands, i haven't tried though
I think you make a file with your command and call it trough a custom Mcode.

in the file:
#!/bin/bash
# M101 - some command
halcmd setp parport.0.pin-XX-out true


There is some more steps to this. I think you need to ad a new new Mcode is the ini file RS274NGC section.

I hope this gives you enough to keywords to search.

/Peter

Thank you Peter,

I don't think I understood much of that

Mike