Octopus PRO + U2C communication problem

General Discussion
1

Basic Information:

Printer Model: Voron 2.4
MCU / Printerboard: Octopus Pro
klippy (3).log (133.1 KB)

Describe your issue:

Hello! I have setup of Octopus Pro + BTT U2C + Fly SHT36. Some time ago i configured Octopus Pro + U2C + EBB SB2209 and it works. But now i can`t reproduce it. BTT U2C and SHT36 are configured now and i flashed klipper to SHT36 with CanBoot. But octopus doesn’t want to work after i change freq setting of my can0 (with EBB SB2209 i configured 1_000_000 freq on can0 but SHT36 is prepared for 500_000 freq, so i changed can0 settings).

Communication schema like this:

image
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So i can`t call to mind what i did in my last setup that Octopus Pro work with U2C. Can someone share klipper firmware settings for communication over BTT U2C? Or CanBoot bootloader makeconfig with klipper firmware settings?

2

If I recall correctly you have to flash the EBB with the right CAN frequency being set in the firmware config before compiling it.
Not just set it in the printer config.

3

Thank you for answer! I don’t have any problem with EBB now (becouse EBB was fired up =( ). Now i have a poblem with Octopus Pro ↔ U2C. Generally i can;t prepare right firmware for MB.

Should i set for communication by U2C?

1
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And should i set up 120Ohm jumper on U2C for USB?

4

Look here:

There are guides for the several revisions of the Octopus boards and a way to get rid of the U2C as well.

Though I’m currently tinkering on an Octopus Pro V1.1 it does not use CAN.
CAN is used on my SKR2…

1 Like
5

Wrong settings for the Octopus Pro connected to a U2C, Klipper Bridge is for when you don’t want to use a U2C or CAN hat.

Should be Communication interface (CAN bus (on PA11/PA12))

See this pdf for the termination requirements with a U2C. Dropbox - U2C Connections and terminations.pdf - Simplify your life

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6

Thank you so much. This is wonderfull doc