'mcu': Unable to open serial port

General Discussion
1

Basic Information:

Printer Model: Sapphire Plus
MCU / Printerboard: Octopus Pro
klippy.log
klippy (5).log (468.3 KB)

Describe your issue:

…

cannot find MCU.
i try to follow a guide from Sineos here
ender-3-v2-linux-machine-no-mcu-found/4635/17 but i don’t get any info from this command:
sudo systemctl list-units | grep brltty
this is my sudo dmesg report
report sudo dmesg .txt (31.4 KB)

please help me

2 
[    7.526943] cdc_acm 1-1.1:1.0: ttyACM0: USB ACM device
[    7.559907] usbcore: registered new interface driver cdc_acm
[    7.559944] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters

Likely the modemanager is spoiling your fun. See Other Single Board Computers (SBC) apart from Raspberry Pis

3

sorry, i don’t understand. I have only a usb camera connected

4

connected to my raspberry pi4

5

Just follow this with modemmanger instead of brltty. It is a system service and has nothing to do with what you have connected.

6

i tried sudo systemctl list-units | grep modemmanger
but didn’t get any reply

7

Hmm, acc to your dmesg, it is active.
Try
dpkg -l | grep modem

8

got this:
pi@printer:~ $ dpkg -l | grep modem
ii libmm-glib0:arm64 1.14.12-0.2 arm64 D-Bus service for managing modems - shared libraries
ii modemmanager 1.14.12-0.2 arm64 D-Bus service for managing modems
pi@printer:~ $

9

run:
sudo apt remove modemmanager
then reboot

10

i did but still have the problem :frowning:

11

What is the output of
ls /dev/serial/by-id/*

Attach a new dmesg after replugging the board and a new klippy.log

12

pi@printer:~ $ ls /dev/serial/by-id/*

ls: cannot access ‘/dev/serial/by-id/*’: No such file or directory

13

Reflash your board, paying extra attention to the correct make menuconfig options. Also check Debian Bullseye Bug causing Klipper to no longer find the printer board - #5 by Sineos

14

so only the board not the raspberry?

15

Yes, only the board is needed

16

i’m also doing the steps in your linked guide

17

It’s working!!! you made my day man!
Many thanks!!

do you still think i ned to reflash the board?

18

Nope, if it is working, you are good to go. Have fun

19

Hi, I have another problem. It started yesterday little before the mcu problem.
From Octoeverywhere and telegram bot i can’t get webcame anymore. I get no signal, but from a pc connected to the same wifi, it works.
I am thinking something is not going well over all, what can it be?

also now octoeverywhere works very badly after i send a print and when the print starts, it cannot connect to it anymore

20

@Sineos, i’m lost and tryed a lot of things. I don’t know what i’m doing wrong… I shared my klippy.log file.

klippy (18).log (36.4 KB)