[solved]HAL pins acting differently in subroutine of Gcode script

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12 Mar 2021 13:22 - 12 Mar 2021 15:02 #201959 by Stormholt
Hello

I am currently trying to create a .ngc macro that can probe a corner of a vice, and i wanted to add some error checking specifically making sure the probe does not hit anything on its way to each of the 3 G38.2 start points.

My idea for this was a do-while loop that would would check an incrementing value and move 1 mm closer each iteration as long as the probe wasn't triggered. Such a subroutine generally looks like this:
G30.1
#1=1
o100 do
    o101 if[ #<_hal[motion.probe-input]> EQ 0 ]
        F#<_ini[PROBE]MEASURE_RETRACT_VELOCITY>
        G53 G1 Z[#5183 + #1]
    o101 else
        (print, probe triggered during jog)
        #1 = [#1 +21]
    o101 endif
    #1  = [#1 + 1]
o100 while [#1 LT 21]

The hal pin motion.probe-input change appropriately using the hal meter and the simulate_probe tool.
however in the script the pin is always 1.
The pin is configured the following way in my hal file
loadrt  or2     names=probing.controllers
addf    probing.controllers         servo-thread
net     probing.probe               =>  probing.controllers.in0
net     probing.toolsetter          =>  probing.controllers.in1
net     probing.probe-toolsetter    <=  probing.controllers.out

net     probing.probe-toolsetter    =>  motion.probe-input

Why is the pin behaving differently in my .ngc script?

I am running linuxcnc 2.8.1
Thank you in advance !
Last edit: 12 Mar 2021 15:02 by Stormholt. Reason: solved

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12 Mar 2021 15:04 #201977 by Stormholt
Every time i give up and succumb and begin to asking on the forum i find the answers shortly after.

This is what i ended up during after find this thread: forum.linuxcnc.org/20-g-code/27055-machi...m-g-code-hal-support
o<probe_corner_vice> sub

G91
#<start_x> = 213
#<start_y> = 150
#<start_z> = -104
G28.1 

(Go to probe start off point)
F[#<_ini[PROBE]MEASURE_RETRACT_VELOCITY>*2]
G38.3 X[-1*[#5161 - #<start_x> ]]
G38.3 Y[-1*[#5162 - #<start_y> ]]
G38.3 Z[-1*[#5163 - #<start_z> ]]

(print, Probing +X direction )
o<xplus> call

(print, set zero also with vice fixed block offset)
G10 L20 P0 X[0 + 49.599 + #<_ini[PROBE]MEASURE_RETRACT_DISTANCE>]
G91

G38.3 Z20
G38.3 X10

o<zminus> call
G91
G38.3 Y20
G38.3 Z-7

o<yminus> call

(set zero also with vice fixed block offset)
G10 L20 P0 Y[0 - 33.597 + #<_ini[PROBE]MEASURE_RETRACT_DISTANCE>]

o<probe_corner_vice> endsub
M2
The following user(s) said Thank You: tommylight

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13 Mar 2021 01:01 #202044 by andypugh

Why is the pin behaving differently in my .ngc script?


The #<hal_.....> parameters return the value of the HAL pin at the time that G-code execution started. (and occasionally update during execution, but not in a dependable way)

If you want a live state, use G38 to get the probe positions, and M65 (and friends) to read values from HAL.
The following user(s) said Thank You: Stormholt

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