Mcu not found while using kiauh on skr 1.4 turbo

General Discussion
1

Basic Information:

Printer Model: ender 3
MCU / Printerboard:skr 1.4 turbo

Describe your issue:im trying to ger klipper on my ender 3 with skr 1.4 turbo but when i use kiauh with putty and try to flash there are no mcu found with usb connecttion

…

2

Make sure that

  1. you have build and flashed according to klipper/config/generic-bigtreetech-skr-v1.4.cfg at master · Klipper3d/klipper · GitHub, i.e. LPC1769
  2. you are not affected by Debian Bullseye Bug causing Klipper to no longer find the printer board
  3. you are not affected by Other Single Board Computers (SBC) apart from Raspberry Pis → last point regarding ModemManager and BRLTTY
3
  1. i uplode that exact config.
    2.i dont think that the issue because i havent got to the point i got my board id from the mcu.
    3.i read thread and i use pi 4 so i dont think that issue with the bigtreetech board.
    if you have any other ideas i would love to hear because im new to this subject and really appreciate your help.
    thank you for the time and effort
4

This is exactly the nature of the bug

Disconnect the board, reconnect it and post or upload the output of sudo dmesg

5

dmesg_output
dmesg_output1903×11513 1.62 MB

6

Dude, posting that was cruel.

Please try again by cut and pasting the sudo dmesg output into the “Preformatted text” option (“</>” in the tabs at the top of the edit window).

3 Likes
7

Just my two cents…
Why bother with USB ?
Compile the firmware using Kiauh. Copy the binary to a µSD card. Reboot the SKR 1.4 T.
And directly wire the SKR to the Pi GPIO using 3 twisted wires : GND, Tx and Rx. Whatever is your problem, doing so you will remove two layers : Serial to USB on the Pi and USB to Serial on the SKR.

As simple as serial: /dev/ttyAMA0 ; it’s been here since Marlin + Octoprint, and it is 100% foolproof.

8

If you followed the procedure above, then your Linux system did not recognize any USB device connected to your host.

Worst case, a dead board otherwise potential reasons are:

  • Not correctly flashed (most likely)
  • USB port / cable issue
  • Destroyed bootloader

The dmesg output of a properly flashed SKR 1.4T looks like:

[1722604.587997] usb 1-1.1: USB disconnect, device number 29
[1722604.890258] usb 1-1.1: new full-speed USB device number 30 using xhci-hcd
[1722605.040761] usb 1-1.1: New USB device found, idVendor=1d50, idProduct=614e, bcdDevice= 1.00
[1722605.040783] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[1722605.040788] usb 1-1.1: Product: lpc1769
[1722605.040792] usb 1-1.1: Manufacturer: Klipper
[1722605.040796] usb 1-1.1: SerialNumber: 0C70001625813AAF86E06B5CC32000F5
[1722605.099940] cdc_acm 1-1.1:1.0: ttyACM0: USB ACM device