Raspberry Pi 4 - USB not working under LinuxCNC

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21 Apr 2022 22:05 - 21 Apr 2022 22:09 #240822 by MTronics
I installed the "linux-image-4.19.71-rt24-v7l+" image on my "Raspberry Pi 4 Model B Rev 1.5", Wifi and SSH enabled. I used Raspberry Pi Imager to burn the image (obtained from here, LinuxCNC.org site) onto a 64GB SD Card and to install the image on the Raspberry Pi.

Everything gets installed, but the USB ports don't work. Thus, no mouse and keyboard function. I checked the installation by using a Bluetooth mouse and keyboard and was able to operate all programs, incl. LinuxCNC.

My mouse and keyboard hardware is working, tested on a Windows machine. And no, my idea ist not to run a CNC controller via USB. I only want to use USB to use a mouse and keyboard.

Am I the only one with this problem ?
Any ideas how to enable USB?

Any help is appreciated.

Thanks

Stefan
Last edit: 21 Apr 2022 22:09 by MTronics.

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21 Apr 2022 22:45 #240833 by andypugh
This was a problem a couple of years ago, but I thought it was fixed...

I don't think that you need the kernel separately, the image file should include a kernel.

One suggestion would be to use the 64-bit image posted on this forum, rather than the 32-bit one from LinuxCNC.
forum.linuxcnc.org/9-installing-linuxcnc...aspberry-pi-4#237299

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22 Apr 2022 22:06 #240926 by MTronics
Hello Andy,

thanks for your quick reply.

I was aware of the post/link that you provided. I was a bit concerned downloading from that link not knowing the source (security reasons). I also didn't install a kernel separately. I just used the image file from linuxCNC.org:
linuxcnc.org/docs/stable/html/getting-st...lling_on_raspbian_10

Do you have a recommendation how I can proceed?

Thanks

Stefan

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22 Apr 2022 22:43 #240932 by andypugh
I created the image on the LinuxCNC website. So if you download that you are trusting me, and if you download the other one you are trusting elovalvo. From where I am sat I see little to choose between us :-)

You do have the option of installing the preempt-rt kernel as a package direct from Debian, but would then need to compile LinuxCNC from source. This takes quite a long time but isn't particularly difficult.

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23 Apr 2022 01:23 #240953 by cakeslob
I dont think the issue went away, I think the 3gb ram thing and elovalvos 64bit image were mediating the issue. I would suggest trying the ram thing, but I cannot find the doc entry for it.

If you revert the image to the non preempt-rt kernel in the config, and install a different preempt-rt, would you still need to compile linuxcnc?

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23 Apr 2022 08:37 #240977 by andypugh

ert the image to the non preempt-rt kernel in the config, and install a different preempt-rt, would you still need to compile linuxcnc?

I am not sure. I think that you would with a 64-bit kernel as the LinuxCNC packages are 32-bit. 

_But_ there are Arm64 packages on Debian now...

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23 Apr 2022 12:23 #240985 by rodw

_But_ there are Arm64 packages on Debian now...


But only for a week or so. I have not had time to test this on my Pi 4b but I think you should grab the Debian Bookworm image from here
raspi.debian.net/daily-images/
And install with the normal Raspberry installer

This will just give you a command line interface so run
sudo tasksel to install a windowing system of your choice

Then just type
sudo apt install  linuxcnc-uspace linuxcnc-uspace-dev
to install linuxcnc.

Please let us know how it goes
Note you will end up with V2.9
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23 Apr 2022 22:54 #241036 by MTronics
Hello guys,
first, I am super impressed with your quick and direct support, esp. since I recognize your names from a lot of other posts. That is great and I want to say thank you!

In the next days I will give your suggestions a try i.e., 3GB limit, kernel swap, different image, maybe recompile LinuxCNC - probably in that order. I will keep you/this forum posted about my results and hopefully a working solution.

I am very interested in getting a RasPi solution running, in combination with my Mesa 7I92H cards. I want to use such a low cost solution, still at high performance due to closed loop servo drives, ridgid tapping etc., for small formfactor CNC mills/lathes. Further motivation - I want to replace my annyoing NCCad/kosy CNC controller (from MaxComputer), at use with a Wabeco CNC mill. In another forum one member said, that this SW/HW platform has more bugs than features. In short, it is quite painful to use and yes, the bug level is pretty high.

Greetings

Stefan
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24 Apr 2022 00:51 - 24 Apr 2022 00:51 #241043 by MTronics
Ok, I followed the "3GB limit" recommendation, as discussed here: forum.linuxcnc.org/9-installing-linuxcnc...i-4-8gb-2gb?start=20. It worked! In my case, the Chromium web browser still works - in the link above it was reported to fail.

Approach: I modified the /boot/config.txt. First, I opened the LXTerminal window and entered "sudo nano /boot/config.txt" to edit the file. Then I added "total_mem=3072" under the "[pi4]" section. Then I rebooted.

To do that you need to terminal into your RasPi from another computer, since USB mouse and keyboard don't work.

Stefan
Last edit: 24 Apr 2022 00:51 by MTronics.

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24 Apr 2022 08:12 #241053 by MTronics
Hello Andy,

despite the 3GB memory limit workaround, I am very interested in a "how to" compile LinuxCNC from source. You mentioned it isn't particularly difficult and I would like to dive into this topic with the target RasPi in mind. Therefore, any help or pointers into this subject are apreciated, like a simple (less workload for the authour/writer) step by step approach, incl. pointers to where I can find "THE" LinuxCNC source files (GitHub?) and maby how to createt the build with corresponding "make" settings. All with RasPi 4B in mind.

PS: I am into programming embedded systems (ATMEL chips), and Windows systems, using C/C++, thus my interest. Now, I would like to get my feet wet in the Linux/Unix world.

Thanks
Stefan

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