'mcu': Unable to connect

General Discussion
21

Well, it should work. It is an uncommon setup and getting UART to work on RPis can be tricky but overall doable.

This is likely to make your life more miserable.

  • The UART connection you compiled into the firmware and flashed to the board must match your physical connection
  • The UART you configured on the RPi must match above and must match the serial setting in printer.cfg

If any of them diverge, you will not get any connection.

22

What about this from Klipper on the BIQU BX V3 Ā· GitHub?

Serial (on UART4 PA0/PA1)` <ā€” For v3 board/screen you need to use this

You never instantiated that according to your klippy.log!

Identical to

It is not compatible! UART and CAN interfaces are both serial connections but not compatible.
Donā€™t give up and spend money for new HW before you tried!

Iā€™m sure itā€™s doable.

23

My thoughts too after I look at any BTT board or their derivatives.
Oddly seems they get about 90% of the way to a pretty solid design and then veer off into left field with some extremely questionable design choice.

1 Like
24

Indeed, once they launch a product they stop keeping up with updates.
Thatsā€™s one reason why I was switching from Marlin to Klipper.
And their support is about 0, but I like the BIQU-BX printer even though I am going to build a Voron 2.4,

25

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