Klipper can no longer connect to MCU

[Jonathjon]

Basic Information:

Printer Model: V1 MP3DP V5
MCU / Printerboard: Manta M8P V2 / CB1 / EBB36
klippy (10).log (150.0 KB)

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Describe your issue:

I set this Manta M8P, CB1 and EBB36 up about 2 weeks ago with the help of JamesH on the discord. Everything was connecting as it should. I set it aside and went about the printer build. This evening I got it all ready to fire up for the first time and now klipper cannot connect to ‘mcu’. The only thing in the printer.cfg file is the uuid for the M8P and the EBB36. Those were correct and working the last time the board was powered up. Now only the EBB36 will connect. Any help for what I need to do from here would be greatly appreciated!

[mykepredko]

What was the process you used to set up Klipper?

I’ve never seen a klippy.log like this one:

1. First off, your printer.cfg looks like it only consists of:

[mcu]
canbus_uuid = b983bbdcfe30

[mcu EBBcan]
canbus_uuid = d8d5848615b3

[printer]
kinematics = none
max_velocity = 1000
max_accel = 1000

2. Initially, you’re unable able to connect “EBBcan” - NOT ‘mcu’. Although ‘mcu’ comes up later.
3. After every connection attempt, you’re doing a rebuild of Klipper and it looks like its for the EBB36.

My recommendation is to start again and follow instructions like:

CANBUS Bridge Mode Configuration

Basic Information: MCU / Printerboard: CAN enabled stm32, same5x, and rp2040 chips Over on the BTT Manta-M8P repo, people have been having a lot of issues getting the MCU into CANBUS bridge mode, so I wrote up the procedure for them to follow. I thought I’d reproduce it here for anyone else struggling to get CAN bridge mode up and running. This example is specific to the BigTreeTech Manta M8P v1.1, but generalizes to other boards with a CAN-enabled MCU and CAN transceiver built in. In the …

[Jonathjon]

Good morning. My original setup was from this guide basically. Although it was from the author on the Klipper Discord server and he sent me the link afterwards. It all worked great.

I was digging around looking for answers last night and came across this thread that is basically my issue, but the fix isn’t working for me.

I did originally use katapult to set up the canboot on both the ebb36 and the M8p. But the uuid and everything is gone from the m8p.

@mykepredko

First off, your printer.cfg looks like it only consists of:

Yes, as I was just trying to get the board all flashed and ready, Then once I had it on the printer I was going to set up my printer.cfg file. Only to find out that it wasn’t working when I turned it it all on lol.

@mykepredko

you’re doing a rebuild of Klipper and it looks like its for the EBB36.

After so many times of trying I was going to go back and re-flash the board, but I cant get a serial ID or a uuid to be able to flash it.

Hopefully these answers don’t make things more confusing. Thanks for the help!

[Jonathjon]

@mykepredko

My recommendation is to start again and follow instructions like:

ok I followed these instructions and the board flashed and gave a uuid, the same one it had before. I did a firmware restart on mainsail and the EBB wouldn’t connect, then firmware restart again and now the mcu wont connect. Went back to putty and ran the can0 query and get nothing. Its like the board isn’t saving the flash.

[Jonathjon]

I have tried to connect the board to STM32 but I don’t get a port when I connect USB to my computer. I can see the board in DFU mode over SSH but my computer doesn’t see the board over USB. I know the cable is good have used it many times

I’m at a loss here of what to do.

[mykepredko]

@Jonathjon

@mykepredko

My recommendation is to start again and follow instructions like:

ok I followed these instructions and the board flashed and gave a uuid, the same one it had before.

Which instructions are you talking about?

Could you explicitly list what you are doing along with the responses from the system?

Again, I recommend that you start with a newly imaged SD Card for your CB1 and list the steps that you are going through.

Sorry, but the link you gave is only for setting up the Manta M8P and not complete for the system. I have no idea if you’ve set up your can0 file and what speeds your setting the different devices with.

Please go through the process again and document each step and response.

[Jonathjon]

Thank you for your help. I believe I have it running now. The canbus wire to the EBB was just barely connected on one of the wires and I believe that was throwing errors and bringing down the network. It is all up and running smoothly now!