bigtreetech / u2c

Pinout

u2c's Issues

U2C v2.1 was found a lots of error issue

hi there
i was flashed can-fd firmware from U2C_V2_STM32G0B1.bin.
but it's found bytes_retransmit=20 and bytes_invalid=10~90 on klippy.log a lots of lines over 1,000 lines.
also that value was affected same even small or bigger(10 to 5,000) txquelen value(as i think shouldn't happen will be better to use.

at this moment i couldn't fixed up and rebuild or modifying by myself without candleLight source for U2C_V2_STM32G0B1.
how'd you think about to share that self build sources of candleLight_fw for STM32G0B1 on github?

this issue gotta Stop and Shutdown MCU or EBB36 if found that bytes_retransmit and bytes_invaild values.

• Octopus 446 (set by can pd0/pd1 via canboot bootloader)
• Ebb36 (set by can pb8/pb9 via canboot bootloader)

! when using U2C v2.1(STM32G0B1) - a lots of timeout error when g28 and stuck & must be reboot at 2~3 layers when printing

! when using U2C v1.1(STM32F072) - nothing on problem

Issue: lacking silkscreen labels for 2 over 2 connectors for tool head boards

No labels for power, CAN-L & CAN-H
This could end up causing damage during improper hookups.

Since it is too late for boards already in the hands of users, please provide a pinout with labels overlaid on the rear photo of the PCB.

No DFU Mode

Hey there,
the blue LED from the U2C V2.1 is always on, but the board is never in DFU mode. Tested with RPI and Windwos with "STM Cube Programmer".
Any ideas?

U2C blow up USB ports Raspberry pi.

After connecting 24V DC PSU to the U2C V2.1 in combination with an EBB36 my usb ports of me Raspberry pi no longer work.
This already happened with and BTT PI4B+CB1 and my Raspberry pi 4 B 4GB.

The 4 canbus wires are connected to the screw terminals along with the PSU wires.
I connected the following to the screw terminals.
24V DC PSU -> U2C VIN -> EBB36 VIN
0V DC PSU -> U2C GND -> EBB36 GND
U2C Can-H -> EBB36 Can-H
U2C Can-L -> EBB36 Can-L

Am I doing something wrong?
Yes! I checked the connections because it is known that the U2C and EBB36 connections are not 1 to 1 the same.

In the meantime, I have already ordered a new U2C.

Missing 3D model

The EBB36/42 CAN have step files available for designing but for this U2C boards it is not offered.
Can you please provide step files here as well?

It makes it much easier to properly design everything in Fusion360 before building it up in real life.

Thank you very much!

Smaller U2C module

Hello,
Do you have firmware / manual / schematic available for the smaller U2C module?

Klipper USB to CAN not working with v2.1

I waste 4 days to get 'not' running your usb-2-can adapter. CanBoot is not working (working with version 1.1 fine).
CanBoot is also not working. Please provide working settings or CanBoot and Klipper.

Restart U2C when klipper restart

I have a trouble, when my print end it powering off the main board(mks robin nano) and the sb2209 by canbus .. ao the raspberry stay on.. then i powering on the printer i only can connect again at the sb2209 if i plugin off the u2c usb cable e pluggin again …

my question is: ther some way to restart usb by klipper because is so hard every time i acess the back the printer to unplug/plug the usb cable from the u2c….

i can run a script on the raspberry host to restart the usb port, but i cant run the scrip when klipper is powering on…