Toggling M67 for laser manually from GUI

10 May 2022 03:16 #242457 by theslawek
I have PWM laser setup on a 7I76E STEPDIR4 port. I use M67 in my GCode to control the laser. I can only enable the laser when I run the program. I'd like to be able to turn on the laser (<1%) with GUI commands (gmoccapy) while doing job setup. What do I need to do? I've browsed the forum but didn't find this exact question and I only started using LinuxCNC a week ago.

Here is my HAL related to Laser.
setp hm2_7i76e.0.pwmgen.00.output-type     1
setp hm2_7i76e.0.pwmgen.pwm_frequency     20000
setp hm2_7i76e.0.pwmgen.00.scale         100

net laser_pwm motion.analog-out-00 => hm2_7i76e.0.pwmgen.00.value # M67 E0 Q#
net laser_pwm_enable => hm2_7i76e.0.pwmgen.00.enable #M62
net laser_pwm_enable => hm2_7i76e.0.7i76.0.0.output-01 #air support solenoid

I tried adding something like this (to hijack the spindle-enable button) to enable the laser but I get an error on startup.
#net spindle-enable => hm2_7i76e.0.pwmgen.00.enable
./CNC_Laser.hal:54: Pin 'hm2_7i76e.0.pwmgen.00.enable' was already linked to signal 'laser_pwm_enable'

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10 May 2022 05:12 #242461 by rodw
I would use one of the Gmocappy macro buttons and issue the M67 gcode. Nice and easy!

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10 May 2022 07:01 #242465 by theslawek
Aha, great idea. Thanks for pointing that out. Not working though. None of my Gcode actually uses M62 to enable the PWM even though I thought it would be needed when I first did the research. I looked at HAL show while running the macro and laser_pwm_enable does toggle, but laser_pwm stays at 0. My air assist solenoid does trigger for the 5 second dwell period, but no laser.

Once we figure out the laser turning on part, I would like for the laser to stay on without needing the dwell period. Is that possible?

Entries in the INI
PARAMETER_FILE = linuxcnc.var

MACRO = laser_trace_on

I created laser_trace_on.ngc in the macros folder. (I know the path is right, because gmoccapy would complain about errors in the file before I fixed them.)
; Test file go to turn on laser for tracing

O<laser_trace_on> sub

M67 E0 Q1

G4 P5

O<laser_trace_on> endsub

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