lost connection to mcu | Mainsail | Page 1

molten sinew Feb 14, 2024, 6:02 AM

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I keep getting "lost connection to mcu" errors, even though i never touched the cable connecting the pi to the motherboard. Are there any other things that can cause this error?

lapis zephyrBOT Feb 14, 2024, 6:07 AM

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Ahoi @molten sinew!
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molten sinew Feb 14, 2024, 6:09 AM

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my mcu temp is stable at 56C, if that matters

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i do not know of any log that would be relevant to my issue, do let me know if any might be required

modern vector Feb 14, 2024, 10:37 AM

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the klipper log file would be of help.
lost connection error often are caused from a bad or poor quality usb cable.

molten sinew Feb 14, 2024, 10:41 AM

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📎 klippy.log

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this is my log

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my cable is good but i know that the microusb port on my motherboard is loose. However it is left undisturbed and free of strain throughout the print, and I am able to reconnect to the mcu without needing to reseat the cable

modern vector Feb 14, 2024, 10:56 AM

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well thats most likly the cause then... your printer has moving parts and the vibration during the print can make the port loose contact for a short time. klipper sents a lot of traffic over the bus and has really small timing windows. just the slightest outage of the connection will cause it to stop.

molten sinew Feb 21, 2024, 2:10 PM

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modern vector well thats most likly the cause then... your printer has moving parts and the vi...

i have confirmed that it is not my cable nor port, by changing from my creality 4.2.2 to a new SKR PICO and connecting over the usb C port. This issue still occurs, I have tested it on both of the pi's USB 3.0 ports

molten sinew Feb 21, 2024, 2:26 PM

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this is my klippy log from today's disconnect error

📎 klippy.log

molten sinew Feb 22, 2024, 4:08 PM

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fresh install of mainsail, still got the same issue at around 1 hr into a print. any ideas @modern vector ?

📎 klippy.log 📎 syslog 📎 dmesg.txt

modern vector Feb 22, 2024, 4:09 PM

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sorry got not really time to look into it.

molten sinew Feb 22, 2024, 4:10 PM

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at this point we have ruled out:

loose usb port
bad usb cable
bad mcu
bad os configuration
usb current draw (i am blocking the usb 5v line)

modern vector Feb 22, 2024, 4:15 PM

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I try to look into it later. Iam quite busy right now.

molten sinew Feb 22, 2024, 4:41 PM

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alright, thanks

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i'll try running over uart tomorrow to see if i can single out usb driver/chip issues

modern vector Feb 22, 2024, 7:54 PM

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can't tell why the mcu disconnects. the syslog shows that the mcu disconnects and comes back 2 minutes later. did you do something during that time?

molten sinew Feb 22, 2024, 11:39 PM

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modern vector can't tell why the mcu disconnects. the syslog shows that the mcu disconnects an...

nope, i leave it printing and just let it do its thing

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i dont touch the printer, web interface or anything near it, but around the 1hr mark the mcu disconnects

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when i see that it has disconnected on the web interface, i press the "firmware restart" button and the mcu reconnects without any other intervention on my part

molten sinew Feb 24, 2024, 5:29 AM

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i've figured out the issue, my printer power supply was cutting power due to over temp shutdown

#lost connection to mcu