Raspberry Pi 4 with Mesa 7c81

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15 Jan 2021 09:28 #195418 by andypugh
If you set up for 5i25 then you would need to swap "hm2_pci" for "hm2_rpspi" and "5i25" to "7c81"

The "loadrt hm2_pci...." line in the HAL will need to match the line you have already used, including the spi address. This might be explicitly in the HAL, but it is more likely that that it uses references to the INI (which much reduces the number of places that need to be edited)

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15 Jan 2021 15:58 #195448 by PCW
Replied by PCW on topic Raspberry Pi 4 with Mesa 7c81
When you run pncconf, you choose the machine name.
When you have finished creating a configuration, the hal/ini files
will be stored in your home directory/linuxcnc/configs/machine_name/.
The ini and main hal files will be named "machine_name.ini and
machine_name. hal.

For example, I just ran a pncconf session and created
a configuration for a machine called "bob-jones", here
are the files in the created directory:

peter@pcw-HP-EliteDesk-800-G1-USDT:~/linuxcnc/configs/bob-jones$ ls
backups custom_gvcp.hal postgui_call_list.hal
bob-jones.hal custom.hal shutdown.hal
bob-jones.ini custom_postgui.hal tool.tbl

The card name is in the bob-jones.ini file:

[HMOT]
CARD0=hm2_5i25.0

You would need to change this to

[HMOT]
CARD0=hm2_7c81.0

The driver is specified in the bob-jones.hal file:

loadrt hm2_pci config=" num_encoders=0 num_pwmgens=1 num_stepgens=5"

You would need to change this to

loadrt hm2_rpspi config=" num_encoders=0 num_pwmgens=1 num_stepgens=5"

BTW the main card setup I used was:

config (note that I have chosen 5 stepgens since 1 is used to drive the G540s charge-pump)



connector 3 (which would be P1 on a 7C81)

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15 Jan 2021 19:08 #195478 by JohnG
Replied by JohnG on topic Raspberry Pi 4 with Mesa 7c81
Thank you so much. I have made the changes. Last question... is it necessary to change all instances of 5l25 in these files to 7c81 or just the two instances that you mentioned?

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15 Jan 2021 19:28 #195480 by PCW
Replied by PCW on topic Raspberry Pi 4 with Mesa 7c81
There should only be one instance of "5i25" and it should be in the .ini file.

This is using the latest version of pncconf and there is a feature for having the
card name as a substitution (alias) from the .ini file:

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15 Jan 2021 19:34 #195481 by JohnG
Replied by JohnG on topic Raspberry Pi 4 with Mesa 7c81
Reading through the Hal file there were several instances. Ex:

setp hm2_5i25.0.Stephen.04.dirsetup

I did not check the use ini substitution box in pncconf. Should I go back through and do that?

Or alternatively make all the changes in the Hal and ini files?

Thank you. This has been such a process and learning experience. Can’t wait to finally turn on the machine!

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15 Jan 2021 19:36 #195483 by JohnG
Replied by JohnG on topic Raspberry Pi 4 with Mesa 7c81
*correction. Example should have read

setp hm2_5i25.0.stepgen.04.dirsetup

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15 Jan 2021 19:50 #195487 by PCW
Replied by PCW on topic Raspberry Pi 4 with Mesa 7c81
You can do it either way, I prefer the substitution way
rather than doing a global find/replace

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15 Jan 2021 22:04 #195490 by JohnG
Replied by JohnG on topic Raspberry Pi 4 with Mesa 7c81
Huge thank you to PCW and andypugh! I have a functional cnc router! So grateful for the knowledge, quick responses and this forum.

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05 Apr 2021 21:09 #204965 by JohnG
Replied by JohnG on topic Raspberry Pi 4 with Mesa 7c81
Back in this forum with an unusual issue that has me puzzled...

There is an issue with my router and circular cutting. When cutting arcs the machine is adding a small linear cut somewhere mid arc (see attached photos) In the photo marked A you can see that it was cutting a very nice arc then all of a sudden moves in a direction that is not part of the arc! I wrote very simple gcode program to test the arc in the part of the photo labeled A in an effort to eliminate the problem being a kCAD/CAM issue as this problem was originally discovered cutting an ellipse using CAD/CAM (label B in photo).

The axis are moving in the same direction throughout the arc which has eliminated backlash as the culprit.

Additionally I have been V carving with the machine and the results have been perfect (including curves of letters, picture shapes etc.)

This seems to be a problem with simple arcs

Totally stumped. Not sure if it’s settings or an issue with the 7c81. Any help would be greatly appreciated.

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05 Apr 2021 22:07 #204970 by PCW
Replied by PCW on topic Raspberry Pi 4 with Mesa 7c81
Is this repeatable?

Is position lost when this happens?

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