Pi can't find Ender 3 with Klipper firmware

[Zoker]

Basic Information:

Printer Model: Ender 3
MCU / Printerboard: SKR Mini V2
klippy.log (12.5 KB)

Describe your issue:

Today I tried to switch from Marlin with Octoprint to Klipper with Fluidd.
My setup is a Ender 3 with a BTT SKR Mini V2 board and a BTT TFT35 E3 V3.0 display.

First I flashed the latest RaspberryOS Lite Bullseye to a Raspberry 3 B+. I then installed KIAUH with the installer script. Afterward I installed klipper, moonraker and fluidd. According to KIAUH these are the installed versions:

| Klipper & API:         |---------------|--------------|
|  1) [Klipper]          | v0.12.0-102   | v0.12.0-102  |
|  2) [Moonraker]        | v0.8.0-310    | v0.8.0-310   |
|                        |               |              |
| Klipper Webinterface:  |---------------|--------------|
|  3) [Mainsail]         |               | v2.9.1       |
|  4) [Fluidd]           | v1.27.1       | v1.27.1      |

After that I entered the klipper subfolder and run make menuconfig.
According to the instruction in the config folder of the Klipper repo, I set the parameters there like this:

I then used the make command to create a firmware. I then downloaded the firmware via SCP from the Pi and renamed it to firmware.bin. I then put the file on a SD card and the card into the printer. Started the printer up, the printer can now no longer connect to the display. I also checked the SD card afterwards and there was a FIRMWARE.cur file with the correct file size and timestamp.

I then plugged the printer into the Pi and rebooted both.

The issue now is, that the Pi does not seem to recognize the printer. I tried switching the cable and even switched the Pi for another one.
But every time I run ls /dev/serial/by-id I get this error:

ls: cannot access '/dev/serial/by-id': No such file or directory

I also tried to run sudo dmesg after plugin it in, but no new event was displayed there.

I then found this thread:

Debian 11 (Bullseye) udev bug - No board or serial found

Background In recent updates, Debian Bullseye (Debian 11) introduced a bug in udev that causes the command ls /dev/serial/by-id/* to fail, because the bug prevents the creation of this device path. As of writing this, the bug remains unfixed in the regular Debian repositories, but it is already fixed in optional Debian repositories. How to Diagnose To check if the OS is affected by the bug, run: sudo apt -y update && sudo apt -y upgrade apt-cache policy udev If the command’s output display…

But the version that was installed was deb11u4 instead of deb11u2. I run the solution anyway and now have 252.5-2~bpo11+1 installed. But still the same issue.

I’m now out of ideas what I can try. I already tried to flash the firmware again but nothing changed. Can somebody maybe give me some hints, what I can try next? Thanks!

[clutch_mccargo]

Have a look at line 251 in your klippy.log

[mcu]
serial = /dev/serial/by-id/<your-mcu-id>

That will never work – the mcu serial port has to be set to a real device.

So if ls /dev/serial/by-id doesn’t show anything, is there any device listed under /dev/serial? Or is there a serial device in your /dev directory?

Try this: Unplug the printer USB and run this in bash on the Pi:

sudo dmesg -w

Plug in the USB and see if any messages show up. If you don’t see anything, you might have a bad cable, bad controller board or something else.

But you should see some useful information about the device, which must go into your printer.cfg [mcu] section

Edit: FYI, I just went through the same conversion recently on 2 Ender 3 Pros… Marlin → Klipper. The serial connection also gave me the most problems