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I would say in general it is not hard to setup, you need to know how. wink
I got it finally working very well with very low latency on my RPI 5

short description:
- take Raspberry OS 64bit Lite
- install Xfce4
- build the RT kernel the usual way
- install it
- install linuxcnc
It takes some time on the RPI.

As I am writing this in Firefox on this machine, latency-histogram (was started befor starting Firefox!) is running and 17 glxgears.
To be honest, so far I am very happy with.

 

Attached please also find a somewhat "script" to build from scratch.

thanks a lot! can that image used on an raspi 5?

Ex corporate pc is cheaper, more powerful, easier to setup than either the 4 or 5.

I'm trying out a new touchscreen with LinuxCNC 2.91 on RaspberryPi today. 

The Touch Screen is recognized in Settings | Mouse and Touchpad; two instances of wch.cn TouchScreen, however touching the screen has no effect either on the desktop or from within Axis.

Do I need to enable a driver, or do something special to get this to work?
The keyboard, mouse etc are also recognized and they both seem to work just fine.
 

Was looking for info about raspberry, do you suggest to make a new buil on pi 4 because it's more stable? Or it's worth go with the 5?

Thank you cakeslob for the response,

I was checking in Linuxcnc system, and the observation was there is no /dev/i2c-1 even if i create it couldn't be read and shows "no such devices or address".

Is it possible to get it ?

What are all the process ?

What am i doing wrong ?

royka wrote:

With 6.12 the kernel needs a small patch to be recognized as realtime for linuxcnc and needs a specific config otherwise it gives an error during compiling:
forum.linuxcnc.org/38-general-linuxcnc-q...6-12?start=10#315437

And see the next post for the necessary config.

LinuxCNC needs X to start, you can try something like:
raspberrypi.stackexchange.com/questions/...hout-showing-desktop
 
 

I've done based on what you said about installing X, and desktop got enabled using start X and linuxcnc showed up. hwoever its latency was really bad, something like 500 us. which it was probably because of not being real-time (without adding the rt patch that you mentioned)

After this, I used that patch that you said and I copied it to /patch/kernel/archive/rockchip64-6.12. However during this build I compiled it with XFCE Desktop. Now after compilation again it doesnt boot at all!!!
I'm trying to find out why it doesnt boot.
Or I can compile it without desktop (minimal) and install X to find out if the latency gets better or not.

Another thing that I did was, I added patch for 6.6.63 rt46 to my 6.6 kernel. but during the compilation I get some errors however it compiles without rt patch

With 6.12 the kernel needs a small patch to be recognized as realtime for linuxcnc and needs a specific config otherwise it gives an error during compiling:
forum.linuxcnc.org/38-general-linuxcnc-q...6-12?start=10#315437

And see the next post for the necessary config.

LinuxCNC needs X to start, you can try something like:
raspberrypi.stackexchange.com/questions/...hout-showing-desktop

Start with the official raspberry pi image, disable wayland, install the real time kernel and then the linuxcnc packages.

In a terminal, what does
xrandr
Return for available resolutions?

Hi everyone!

i'm quite new to linuxcnc and have some basic knowledge about linux, i don't want to compile a kernel and that stuff, installing specific packages are nit a problem...

at the moment i'm using a raspi 5 image from linuxcnc download page.
I have some resolution problems with my 7" touchpad, it loads the one and only available resolution 1920x...
i would like to have another resolution, my problem is that the "normal" things for raspi do not worl with debian image.

2 Questions:
- how do i do that with the linuxcnc debian image ?
- should i switch to the image provided here with raspios ?

i'm using the raspi together witth mesa ethernet card

thanks a lot

Lars

royka wrote:

Alright, I assumed you would have one since you have an rpi image builder. But likely it uses a prebuild from Debian that seems to be patched already.

Yes, I built the Pi images for Linuxcnc you find on the downloads page. I shared my repo for the builder on this thread earlier. Bear in mind the pi5 was released just after we released Linuxcnc 2.91 and at the time pi5 support was patchy in the upstream builder. I've since updated the builder and it has been tested on the Pi5 and the shortcomings are reported to be gone.

We actually build the kernel .deb from the official Raspberry pi kernel repo and wrap Debian around it and build a compressed image. The 6.12  kernel should be supported by the builder. You should give it a go. As its cross compiled, building the kernel will be quicker than  it can ever be on a Pi and the kernel as well as an optional img (which we compress) is built.

probably possible, here are a few rpi/ i2c driver samples i have saved 

github.com/bosston88/LinuxCNCRPi/blob/ma...hive/i2c%20example.c
github.com/bosston88/LinuxCNCRPi/blob/master/mcp3421.c
github.com/bosston88/LinuxCNCRPi/blob/master/si7021.c
github.com/thgerner/hal_mcp23017

royka wrote:

@rodw Can you confirm that it's the same with the Raspberry or is that kernel source already patched?
 

Sorry, I have no Idea. I don't have a Pi5.
Did you find the code Linuxcnc uses for this check in Git?
 

Can you please try this later version of the linuxcnc image
drive.google.com/file/d/16xQfd_zXuXXKXqO...IY0/view?usp=sharing
I believe the screen issues are solved because the underlying Pi code had some fixes