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- meister
- meister
16 Apr 2025 09:10
Replied by meister on topic Custom interface board questions
Custom interface board questions
Category: General LinuxCNC Questions
why something new again ?
there are now enough projects, why not bundle the work?
- encoder scaling: where is it applied with a Mesa board? In the FPGA (did not find anything in the VHDL) or the hostmot2 driver or in LinuxCNC main software?
RIO calculate the offset and scaling inside the hal_component
- motor acceleration and max speed: the same question
and this inside LinuxCNC and the PID controller
there are now enough projects, why not bundle the work?
- encoder scaling: where is it applied with a Mesa board? In the FPGA (did not find anything in the VHDL) or the hostmot2 driver or in LinuxCNC main software?
RIO calculate the offset and scaling inside the hal_component
- motor acceleration and max speed: the same question
and this inside LinuxCNC and the PID controller
- tommylight
16 Apr 2025 09:10
Replied by tommylight on topic LinuxCNC S-Curve Accelerations
LinuxCNC S-Curve Accelerations
Category: General LinuxCNC Questions
- tommylight
16 Apr 2025 09:02
Replied by tommylight on topic Custom interface board questions
Custom interface board questions
Category: General LinuxCNC Questions
In LinuxCNC, in the ini file.Now to my questions:
- encoder scaling: where is it applied with a Mesa board? In the FPGA (did not find anything in the VHDL) or the hostmot2 driver or in LinuxCNC main software?
- motor acceleration and max speed: the same question
- Grotius
16 Apr 2025 08:02
Replied by Grotius on topic LinuxCNC S-Curve Accelerations
LinuxCNC S-Curve Accelerations
Category: General LinuxCNC Questions
Hi,
Before starting to change kernels etc. I thought maybe first do the latency-histogram test.
I did this on 2 different pc's.
From what i read here : max us > 100 = is bad.
Is this value both the same for base- & servo-thread?
Or maybe i am reading the histogram not correct.
Before starting to change kernels etc. I thought maybe first do the latency-histogram test.
I did this on 2 different pc's.
From what i read here : max us > 100 = is bad.
Is this value both the same for base- & servo-thread?
Or maybe i am reading the histogram not correct.
- ajar171
- ajar171
16 Apr 2025 07:55 - 16 Apr 2025 08:41
Custom interface board questions was created by ajar171
Custom interface board questions
Category: General LinuxCNC Questions
Hi everyone!
Long time lurker here
Being fed up with the random avaiability of Mesa hardware in the EU, I decided to start designing an open source interface board. The schematics and PCB designs are almost finished, the firmware works so far, that I have communication between a development board and LinuxCNC and can control digital and analog inputs and outputs, read encoder inputs, etc.. So far so good...
Now to my questions:
- encoder scaling: where is it applied with a Mesa board? In the FPGA (did not find anything in the VHDL) or the hostmot2 driver or in LinuxCNC main software?
- motor acceleration and max speed: the same question
Thanks in advance!
Long time lurker here
Being fed up with the random avaiability of Mesa hardware in the EU, I decided to start designing an open source interface board. The schematics and PCB designs are almost finished, the firmware works so far, that I have communication between a development board and LinuxCNC and can control digital and analog inputs and outputs, read encoder inputs, etc.. So far so good...
Now to my questions:
- encoder scaling: where is it applied with a Mesa board? In the FPGA (did not find anything in the VHDL) or the hostmot2 driver or in LinuxCNC main software?
- motor acceleration and max speed: the same question
Thanks in advance!
- Aciera
16 Apr 2025 06:16 - 16 Apr 2025 06:30
Replied by Aciera on topic Remap M6 in python
Remap M6 in python
Category: General LinuxCNC Questions
- unknown
- unknown
16 Apr 2025 05:54
- Aciera
16 Apr 2025 05:36 - 16 Apr 2025 06:49
Replied by Aciera on topic Remap M6 in python
Remap M6 in python
Category: General LinuxCNC Questions
Python remaps are tricky to get right. I'm no expert but I have done a lot of trial and error during my work on Tilted Work Plane codes which uses a fairly complex python remap (although no M64, M65 usage).
github.com/LinuxCNC/linuxcnc/blob/master...ting/python/remap.py
On this background I would like to point out a few general things:
You might want to put something like this at the beginning of your remap so it does not execute on load:
Also note this restriction for the 'yield' feature:
linuxcnc.org/docs/html/remap/remap.html
which means that code like this is not allowed:
instead you could use:
Premature execution of the python remap by the read ahead may also be a problem. While 'yield INTERP_EXECUTE_FINISH' at the beginning would prevent that it would also bar the use of 'self.execute()' after it (as pointed out above). My usual workaround is to call the python remap through an ngc wrapper like this:
github.com/LinuxCNC/linuxcnc/blob/master...ting/python/remap.py
On this background I would like to point out a few general things:
You might want to put something like this at the beginning of your remap so it does not execute on load:
if self.task == 0: # ignore the preview interpreter
yield INTERP_EXECUTE_FINISH
return INTERP_OKAlso note this restriction for the 'yield' feature:
linuxcnc.org/docs/html/remap/remap.html
which means that code like this is not allowed:
if router_down:
print("Raising Router (P14)")
self.execute("M64 P14")
yield INTERP_EXECUTE_FINISH
time.sleep(2)
self.execute("M65 P14")
yield INTERP_EXECUTE_FINISHinstead you could use:
if router_down:
print("Raising Router (P14)")
self.execute("M64 P14")
self.execute("G04 P2")
self.execute("M65 P14")Premature execution of the python remap by the read ahead may also be a problem. While 'yield INTERP_EXECUTE_FINISH' at the beginning would prevent that it would also bar the use of 'self.execute()' after it (as pointed out above). My usual workaround is to call the python remap through an ngc wrapper like this:
o<m6wrapper>sub
M66 L0 E0 ;force sync, stop read ahead
(call your python remap here)
M66 L0 E0
o<m6wrapper>endsub
m2
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