Mcu unable to connect to klipper

General Discussion
1

Basic Information:

Printer Model: ender 3 v2
MCU / Printerboard: 4.2.2
pi zero 2 w

klippy.log (148.6 KB)

printer.cfg (6.0 KB)

I am unable to connect to my mcu I have flashed my board several times but whenever I run: ls /dev/serial/by-id/*
the output is /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0 and does not associate with klipper whatsoever. I dont know whats wrong any help would be very appreciated.

2

See Issues flashing the printer board

3

I followed everything and it still wont connect

4

There is not much more guidance we can offer.
This is a well known board that works with thousands of Klipper installations and your symptoms are also well known. With a probability of 99.873% the reason is within the listed items.

5

A new update after removing BRltty I am now getting the error:Internal error during connect: read failed: device reports readiness to read but returned no data

6

Please always provide a fresh klippy.log so that we can see what is going on.

7

klippy (4).log (52.8 KB)

8

According to the log there are still connection problems between the RPi and the printer-board.
Unfortunately and due to the nature of this problem, the log can only contain the fact that ii is there but not WHY it is there.

Some additional clues might offer the dmesg command that you will also find in the already posted link.
If you need support reading its output, then follow the procedure and attach the resulting dmesg.txt

11

I have resoled that issue but am now getting’’ mcu ‘mcu’: Unable to connect
Once the underlying issue is corrected, use the
“FIRMWARE_RESTART” command to reset the firmware, reload the
config, and restart the host software.
Error configuring printer’’ error

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1 Like
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klippy.log (39.9 KB)

14

The symptoms and the error types are still the same according to the log and the solution most likely to be found among the points in the initial link.

I propose working through them from top to bottom, starting with being absolutely sure on the type of MCU on your board and the respective settings it requires.

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