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  • atrex77
  • atrex77's Avatar
26 Mar 2025 13:10 - 26 Mar 2025 13:11

Developing a Raspberry Pi Pico-based I/O Board for LinuxCNC

Category: General LinuxCNC Questions

Update: I'm making progress toward my goal. Here's a new screenshot of the burst transfer rate. I've moved away from Arduino IDE and switched to using the Pico-SDK and VS Code for coding. Added serial terminal to the code to set the IP address later without coding, the Pico now uses DMA and Burst SPI data transfer instead of byte-by-byte transfer. I don’t think I can push the transfer rate any further. Unfortunately, neither the PCB nor the components have arrived yet, so I can’t proceed with the I/O. In the meantime, I’ve started experimenting with the step generator.
 
  • Z3rni3
  • Z3rni3
26 Mar 2025 12:54
Installing Mesact was created by Z3rni3

Installing Mesact

Category: General LinuxCNC Questions

Hey.
I've been trying to get a 7i95T to work but cant seem to get a working config.
After reading on the forums, that the Mesact helps out a lot i wanted to give it a try but it seems, that i'm doing something wrong installing it.
I'm guessing that i am missing the public key

This is the error it gives me:
cnc@raspberrypi:~$ sudo apt update Hit:1 http://deb.debian.org/debian bookworm InRelease Hit:2 http://deb.debian.org/debian bookworm-updates InRelease Hit:3 http://download.opensuse.org/repositories/science:/EtherLab/Debian_12 ./ InRelease Hit:4 http://deb.debian.org/debian bookworm-proposed-updates InRelease Hit:5 http://deb.debian.org/debian-security bookworm-security InRelease Hit:6 http://deb.debian.org/debian bookworm-backports InRelease Hit:7 https://packages.microsoft.com/repos/vscode stable InRelease Hit:8 https://www.linuxcnc.org bookworm InRelease Get:9 https://gnipsel.com/mesact/apt-repo stable InRelease [2,608 B] Err:9 https://gnipsel.com/mesact/apt-repo stable InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6F8DFB65A82CD322 Reading package lists... Done W: GPG error: https://gnipsel.com/mesact/apt-repo stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6F8DFB65A82CD322 E: The repository 'https://gnipsel.com/mesact/apt-repo stable InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
Thank you for your help.
  • faeluke
  • faeluke's Avatar
25 Mar 2025 19:09
Replied by faeluke on topic Raspberry Pi 4 and bad latency.. SOLUTIONS?

Raspberry Pi 4 and bad latency.. SOLUTIONS?

Category: Installing LinuxCNC

Well, that was easy! Thank you sirl
I think I'll make some chips!
  • tommylight
  • tommylight's Avatar
25 Mar 2025 17:42
Replied by tommylight on topic Raspberry Pi 4 and bad latency.. SOLUTIONS?

Raspberry Pi 4 and bad latency.. SOLUTIONS?

Category: Installing LinuxCNC

Set the servo period in the ini file to 2000000 (2 million) and set the P value for each joint/axis to 500.
  • faeluke
  • faeluke's Avatar
25 Mar 2025 17:39
Replied by faeluke on topic Raspberry Pi 4 and bad latency.. SOLUTIONS?

Raspberry Pi 4 and bad latency.. SOLUTIONS?

Category: Installing LinuxCNC

So... 

What if LinuxCNC complains while starting...?

When running the latency test Tommy suggested, I saw a similar graph.

I migrated my working configuration to the PI4.. Then, I was visited by the dreaded latency complaint. 

Everything appears to work. I am running a Mesa ethernet card. What are the steps to debug and rectify the situation on a PI? 

Frank.hal attached. Do you need to see any more files?


 
  • Z3rni3
  • Z3rni3
25 Mar 2025 10:35
Problem with Limit switches was created by Z3rni3

Problem with Limit switches

Category: General LinuxCNC Questions

Hey,
i'm running LinuxCNC 2.9.4 on a Raspberry Pi 5 in combination with a Mesa Card 7i96S.

I seem to be doing something wrong with my limit switches.
When i manually trigger one Switch all LED's to the coresponding pins to the 4 Limit switches on the board turn on.
They are wired to the board as seen in the picture following
X = 0 / Y1 = 1 / Y2 = 2 / Z = 3
The VCC and Ground are wired in parallel to the 5V and Ground the Mesa card is connected to.

Any help would be appreciated. 
  • looping
  • looping
24 Mar 2025 08:11
Replied by looping on topic Trying out LinuxCNC on Raspberry PI5

Trying out LinuxCNC on Raspberry PI5

Category: General LinuxCNC Questions

@rodw excellent ! I couldn't spot any differences from x64 build
  • elovalvo
  • elovalvo
24 Mar 2025 06:21
Replied by elovalvo on topic Trying out LinuxCNC on Raspberry PI5

Trying out LinuxCNC on Raspberry PI5

Category: General LinuxCNC Questions

What's the easiest interface board for a new user to use
Parport bob is easy to use.
There are guides to set it up.

www.instructables.com/LinuxCNC-on-Raspbe...Pi-With-GPIO-Control
  • rodw
  • rodw's Avatar
24 Mar 2025 03:31
Replied by rodw on topic Trying out LinuxCNC on Raspberry PI5

Trying out LinuxCNC on Raspberry PI5

Category: General LinuxCNC Questions

Is it possible to use the Master version on a Pi5 ?

It isn't supported out of the box but you could build it from source. I made a video

 
  • hitchhiker
  • hitchhiker
23 Mar 2025 21:58
Replied by hitchhiker on topic Raspberry Pi 4 and bad latency.. SOLUTIONS?

Raspberry Pi 4 and bad latency.. SOLUTIONS?

Category: Installing LinuxCNC

ok and the stripes on the sides are indicator for bad latency and the middle doesnt interrest?!
  • tommylight
  • tommylight's Avatar
23 Mar 2025 21:37
Replied by tommylight on topic Raspberry Pi 4 and bad latency.. SOLUTIONS?

Raspberry Pi 4 and bad latency.. SOLUTIONS?

Category: Installing LinuxCNC

When not using --show , the stripes on both sides of the graph will show that there are latency excursions beyond the visible area, meaning the latency is so big it can not be shown on the graph.
Using --show will add two more fields where the number of excursions is shown.
In short:
-stripes on both sides = bad latency that can not be shown in the graph
-no stripes = latency is only as shown in the graph.
  • hitchhiker
  • hitchhiker
23 Mar 2025 21:24
Replied by hitchhiker on topic Raspberry Pi 4 and bad latency.. SOLUTIONS?

Raspberry Pi 4 and bad latency.. SOLUTIONS?

Category: Installing LinuxCNC

aaaah ok... i dont undeestand because i see in the middle the big Mountain.. but left and right only 2 small stripes...

i trust what you say but dont understand in all.
  • looping
  • looping
23 Mar 2025 15:23
Replied by looping on topic Trying out LinuxCNC on Raspberry PI5

Trying out LinuxCNC on Raspberry PI5

Category: General LinuxCNC Questions

Is it possible to use the Master version on a Pi5 ?
  • unknown
  • unknown
23 Mar 2025 15:04
Replied by unknown on topic Raspberry Pi 5 CNC configuration software

Raspberry Pi 5 CNC configuration software

Category: Show Your Stuff

Ok I see it's a windows EXE, correct ?

What Mesa boards does it cover ?
What issue were you having with the supplied tools with Linuxcnc ?
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