FPGA (field programmable gate array) programmed for linuxcnc motion

andypugh
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17 Jul 2018 12:33 #114372 by andypugh

Replied by andypugh on topic FPGA (field programmable gate array) programmed for linuxcnc motion

The probing in preview problem can be bypassed with a bit of G-code logic.
(Possibly in the preprocessor).

The issue is what value the preview reads as the probe position. You can trap this in the G-code and subsitute a value:
linuxcnc.org/docs/2.7/html/gcode/overvie...ml#_named_parameters
Look at the #<_task> named parameter.
Wapping the probe move in a O100 IF [#<_task> EQ 1] / O100 ENDIF block will skip the probe during preview.

The following user(s) said Thank You: rodw

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rodw
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17 Jul 2018 13:00 #114377 by rodw

Replied by rodw on topic FPGA (field programmable gate array) programmed for linuxcnc motion

Andy, thanks so much for our input. I'll try this the first chance I get.

The docs you linked to state:

#<_task> - 1.0 if the executing interpreter instance is part of milltask, 0.0 otherwise. Sometimes it is 
necessary to treat this case specially to retain proper preview, for instance when testing the success of a 
probe (G38.x) by inspecting #5070, which will always fail in the preview interpreter (e.g. Axis).

so it makes sense to me.

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