Raspberry Pi 4 Tutorial - fatal error

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03 Sep 2019 20:54 #144089 by Hakan
Replied by Hakan on topic Raspberry Pi 4 Tutorial
Find older packages and use them. There are no older packages for RPi 4, but the packages for RPI 3 work. Get those for raspbian 9 and it should all work again.

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04 Sep 2019 05:30 #144124 by Hakan
Replied by Hakan on topic Raspberry Pi 4 Tutorial
I'm back on a decent computer and could look for it. Here is how I solved the python-rsvg missing package
forum.linuxcnc.org/18-computer/36879-ras...pi-4?start=50#140800

I assume that other old packages can be found at the same place.

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05 Sep 2019 01:29 #144168 by JohnnyCNC
Replied by JohnnyCNC on topic Raspberry Pi 4 Tutorial
I gave it a whirl and one thing that got me a little off-track was that I had gotten used to cutting and pasting the commands and it was late evening and when I got to this one "sudo apt install openbox, lxterminal and lightdm" it failed because I should have entered:

sudo apt install openbox
sudo apt install lxterminal
sudo apt install lightdm

I also lost my network connection (my fault) while debuild -uc -us was running and had to start it again.

Now, how do I start Linuxcnc from the command line? It is not on the Caja menus and I tried "linuxcnc" and I get "command not found". At this point I was just going to check latency as I don't have 7i76E yet.

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05 Sep 2019 11:44 #144232 by andypugh
Replied by andypugh on topic Raspberry Pi 4 Tutorial

I should have entered:

sudo apt install openbox
sudo apt install lxterminal
sudo apt install lightdm


This works too:
sudo apt install openbox lxterminal lightdm

Now, how do I start Linuxcnc from the command line? It is not on the Caja menus and I tried "linuxcnc" and I get "command not found". At this point I was just going to check latency as I don't have 7i76E yet.


If it is a built-from-source run-in-place version then before you can enter any linuxcnc commands you need
. ./linuxcnc-dev/scripts/rip-environment
And that really is dot space dot slash.

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05 Sep 2019 13:10 - 05 Sep 2019 13:13 #144237 by BigJohnT
Replied by BigJohnT on topic Raspberry Pi 4 Tutorial
If you followed the tutorial past the point of installing LinuxCNC you just open a terminal and type
linuxcnc

I add them to the right click menu by opening a terminal and running the menu config tool
obmenu

I'll work on the tutorial some more when I return from vacation.

Thanks for the feedback.

JT
Last edit: 05 Sep 2019 13:13 by BigJohnT.

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05 Sep 2019 16:21 #144246 by JohnnyCNC
Replied by JohnnyCNC on topic Raspberry Pi 4 Tutorial
I tried linuxcnc at the command line but got "command not found".

I'm going to try what Andy said and see what happens. I'm going to get a couple more SD cards so I can run through it again without wiping out this one.

Thanks

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05 Sep 2019 20:46 #144272 by BigJohnT
Replied by BigJohnT on topic Raspberry Pi 4 Tutorial
Did you install LinuxCNC?
gnipsel.com/linuxcnc/uspace/rpi4-emc.html

The next step after installing OpenBox is to install LinuxCNC...

JT

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05 Sep 2019 22:06 #144283 by JohnnyCNC
Replied by JohnnyCNC on topic Raspberry Pi 4 Tutorial
Yes, I did. But I just did everything on the Install LinuxCNC
page again and it is now working. I must admit that every time I read about someone wanting to use a RPi my thoughts when to "Do you want to build a CNC machine or play with a Pi?" I must say that so far I am impressed with how snappy LinuxCNC feels and how bright the display looks. I have a Pi 4 with 4mb. Now to run the latency test and see how that goes.

Thanks
John

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06 Sep 2019 02:50 #144308 by JohnnyCNC
Replied by JohnnyCNC on topic Raspberry Pi 4 Tutorial
I ran the latency test with 6 glxgears running but no other abuse.
Servo thread (1ms): 73079
Base thread (25us): 93953

If I run just the servo thread the number goes up over 100,000.

Anything I should try to lower the latency on the Pi4?

I may get a 7i76E and give this a try. Right now I'm using a 6i25+7i76+7i83

John

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06 Sep 2019 03:10 #144309 by PCW
Replied by PCW on topic Raspberry Pi 4 Tutorial
You could also use your 7I76 and 7I83 with a 7I92H or 7I92M replacing the 6I25

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