Random: Timeout with MCU 'mcu'

General Discussion
1

Basic Information:

Printer Model: Ender3 V3 SE
MCU / Printerboard: stock STM32F103
Host / SBC Raspberry 3B+
Klippy log klippy.zip (727.7 KB)
DMESG dmesg.txt (67.1 KB)

random: Timeout with MCU ‘mcu’

I have flashed my Ender3 V3 SE and run Klipper since 3 weeks.
Unfortunately I get random: Timeout with MCU ‘mcu’ sometimes after a couple of minutes sometimes after 24hours. Mostley in the midle of printes but it also happend in standby one time.

I tried the last weeks a lot.
Different power supplys for the Raspberry
Different USB cables
isolate the 5v and ground Pin from USB cable
different micro SD card
other system (Mainsail OS)
flash the firmawre multiple times. Also with a prebuild

The only thing what had a effect was to reduce the baud rate to 115200 instead of 250000 in the firmware.
but also there I had after 3 days a MCU timeout.

In DMESG I found everytime the error:
ch341-uart ttyUSB0: usb_serial_generic_read_bulk_callback - urb stopped: -32

dmesg
dmesg735×638 110 KB

Maybe some of you have a solution for my issue.

Thanks

2

Please find logs from today below.

DMESG log

[ 1884.027186] mmc1: Controller never released inhibit bit(s).
[ 1884.027338] brcmfmac: brcmf_sdio_read_control: read 2048 control bytes failed : -5
[ 1884.027364] brcmfmac: brcmf_sdio_rxfail: abort command, terminate frame, send NAK
[ 8643.983957] ch341-uart ttyUSB0: usb_serial_generic_read_bulk_callback - urb s topped: -32
[15534.420863] ch341-uart ttyUSB0: usb_serial_generic_read_bulk_callback - urb s topped: -32
[87869.071197] systemd[22090]: memfd_create() called without MFD_EXEC or MFD_NOE XEC_SEAL set
Klipper@Klipper:~ $

Klipper log

Stats 15531.2: gcodein=0 mcu: mcu_awake=0.020 mcu_task_avg=0.000029 mcu_task_stddev=0.000024 bytes_write=41517799 bytes_read=7238267 bytes_retransmit=9 bytes_invalid=0 send_seq=717521 receive_seq=717521 retransmit_seq=2 srtt=0.003 rttvar=0.000 rto=0.025 ready_bytes=41 upcoming_bytes=1919 freq=71998891 sd_pos=11154977 heater_bed: target=60 temp=60.0 pwm=0.293 mcu_temp: temp=35.8 Orange_Pi: temp=41.3 sysload=0.31 cputime=840.117 memavail=617616 print_time=15538.887 buffer_time=2.628 print_stall=0 extruder: target=215 temp=214.9 pwm=0.663
Stats 15532.2: gcodein=0 mcu: mcu_awake=0.022 mcu_task_avg=0.000035 mcu_task_stddev=0.000024 bytes_write=41521664 bytes_read=7238869 bytes_retransmit=9 bytes_invalid=0 send_seq=717585 receive_seq=717585 retransmit_seq=2 srtt=0.003 rttvar=0.000 rto=0.025 ready_bytes=50 upcoming_bytes=1592 freq=71998892 sd_pos=11155725 heater_bed: target=60 temp=60.0 pwm=0.219 mcu_temp: temp=35.8 Orange_Pi: temp=41.3 sysload=0.31 cputime=840.180 memavail=617156 print_time=15539.635 buffer_time=2.376 print_stall=0 extruder: target=215 temp=214.9 pwm=0.663
Stats 15533.2: gcodein=0 mcu: mcu_awake=0.022 mcu_task_avg=0.000035 mcu_task_stddev=0.000024 bytes_write=41526139 bytes_read=7239524 bytes_retransmit=9 bytes_invalid=0 send_seq=717660 receive_seq=717660 retransmit_seq=2 srtt=0.003 rttvar=0.001 rto=0.025 ready_bytes=33 upcoming_bytes=1680 freq=71998896 sd_pos=11158185 heater_bed: target=60 temp=60.0 pwm=0.236 mcu_temp: temp=35.9 Orange_Pi: temp=41.3 sysload=0.28 cputime=840.256 memavail=616916 print_time=15540.590 buffer_time=2.331 print_stall=0 extruder: target=215 temp=214.9 pwm=0.663
toolhead: max_velocity: 350.000000
max_accel: 2000.000000
minimum_cruise_ratio: 0.500000
square_corner_velocity: 5.000000
Stats 15534.2: gcodein=0 mcu: mcu_awake=0.022 mcu_task_avg=0.000035 mcu_task_stddev=0.000024 bytes_write=41530390 bytes_read=7240130 bytes_retransmit=9 bytes_invalid=0 send_seq=717731 receive_seq=717731 retransmit_seq=2 srtt=0.003 rttvar=0.000 rto=0.025 ready_bytes=44 upcoming_bytes=0 freq=71998894 sd_pos=11159069 heater_bed: target=60 temp=60.0 pwm=0.175 mcu_temp: temp=35.7 Orange_Pi: temp=40.8 sysload=0.28 cputime=840.318 memavail=616676 print_time=15541.287 buffer_time=2.026 print_stall=0 extruder: target=215 temp=214.8 pwm=0.663
toolhead: max_velocity: 350.000000
max_accel: 2500.000000
minimum_cruise_ratio: 0.500000
square_corner_velocity: 5.000000
toolhead: max_velocity: 350.000000
max_accel: 1000.000000
minimum_cruise_ratio: 0.500000
square_corner_velocity: 5.000000
Stats 15535.2: gcodein=0 mcu: mcu_awake=0.022 mcu_task_avg=0.000035 mcu_task_stddev=0.000024 bytes_write=41531705 bytes_read=7240398 bytes_retransmit=914 bytes_invalid=0 send_seq=717755 receive_seq=717752 retransmit_seq=717755 srtt=0.003 rttvar=0.001 rto=0.800 ready_bytes=7 upcoming_bytes=3346 freq=71998891 sd_pos=11161476 heater_bed: target=60 temp=60.0 pwm=0.232 mcu_temp: temp=35.8 Orange_Pi: temp=40.8 sysload=0.28 cputime=840.389 memavail=616676 print_time=15542.462 buffer_time=2.197 print_stall=0 extruder: target=215 temp=214.9 pwm=0.663
toolhead: max_velocity: 350.000000
max_accel: 2500.000000
minimum_cruise_ratio: 0.500000
square_corner_velocity: 5.000000
Stats 15536.2: gcodein=0 mcu: mcu_awake=0.022 mcu_task_avg=0.000035 mcu_task_stddev=0.000024 bytes_write=41531705 bytes_read=7240398 bytes_retransmit=1095 bytes_invalid=0 send_seq=717755 receive_seq=717752 retransmit_seq=717755 srtt=0.003 rttvar=0.001 rto=1.600 ready_bytes=7 upcoming_bytes=9471 freq=71998891 sd_pos=11162512 heater_bed: target=60 temp=60.0 pwm=0.232 mcu_temp: temp=35.8 Orange_Pi: temp=40.8 sysload=0.28 cputime=840.441 memavail=616676 print_time=15544.073 buffer_time=2.807 print_stall=0 extruder: target=215 temp=214.9 pwm=0.663
toolhead: max_velocity: 350.000000
max_accel: 2000.000000
minimum_cruise_ratio: 0.500000
square_corner_velocity: 5.000000
Stats 15537.2: gcodein=0 mcu: mcu_awake=0.022 mcu_task_avg=0.000035 mcu_task_stddev=0.000024 bytes_write=41531705 bytes_read=7240398 bytes_retransmit=1095 bytes_invalid=0 send_seq=717755 receive_seq=717752 retransmit_seq=717755 srtt=0.003 rttvar=0.001 rto=1.600 ready_bytes=7 upcoming_bytes=12422 freq=71998891 sd_pos=11163760 heater_bed: target=60 temp=60.0 pwm=0.232 mcu_temp: temp=35.8 Orange_Pi: temp=41.3 sysload=0.28 cputime=840.477 memavail=616680 print_time=15544.900 buffer_time=2.633 print_stall=0 extruder: target=215 temp=214.9 pwm=0.663
Stats 15538.2: gcodein=0 mcu: mcu_awake=0.022 mcu_task_avg=0.000035 mcu_task_stddev=0.000024 bytes_write=41531705 bytes_read=7240398 bytes_retransmit=1276 bytes_invalid=0 send_seq=717755 receive_seq=717752 retransmit_seq=717755 srtt=0.003 rttvar=0.001 rto=3.200 ready_bytes=7 upcoming_bytes=14610 freq=71998891 sd_pos=11165171 heater_bed: target=60 temp=60.0 pwm=0.232 mcu_temp: temp=35.8 Orange_Pi: temp=40.8 sysload=0.26 cputime=840.512 memavail=616680 print_time=15545.390 buffer_time=2.121 print_stall=0 extruder: target=215 temp=214.9 pwm=0.663
toolhead: max_velocity: 350.000000
max_accel: 2500.000000
minimum_cruise_ratio: 0.500000
square_corner_velocity: 5.000000
toolhead: max_velocity: 350.000000
max_accel: 1000.000000
minimum_cruise_ratio: 0.500000
square_corner_velocity: 5.000000
Stats 15539.2: gcodein=0 mcu: mcu_awake=0.022 mcu_task_avg=0.000035 mcu_task_stddev=0.000024 bytes_write=41531705 bytes_read=7240398 bytes_retransmit=1276 bytes_invalid=0 send_seq=717755 receive_seq=717752 retransmit_seq=717755 srtt=0.003 rttvar=0.001 rto=3.200 ready_bytes=7 upcoming_bytes=19587 freq=71998891 sd_pos=11167961 heater_bed: target=60 temp=60.0 pwm=0.232 mcu_temp: temp=35.8 Orange_Pi: temp=40.8 sysload=0.26 cputime=840.575 memavail=616680 print_time=15546.511 buffer_time=2.243 print_stall=0 extruder: target=215 temp=214.9 pwm=0.663
Timeout with MCU ‘mcu’ (eventtime=15540.238078)
Transition to shutdown state: Lost communication with MCU ‘mcu’
Dumping gcode input 0 blocks
Dumping 20 requests for client 548260735824
Received 15050.380931: b’{“id”: 547746745040, “method”: “objects/query”, “params”: {“objects”: {“print_stats”: null}}}’

3

Please always attach such information as a file.

Your dmesg output points to some hardware instabilities regarding the USB connection. Unfortunately, it is not clear what is causing it. Typical issues are listed here: Timeout with MCU / Lost communication with MCU

4

I solved the issue.
The Raspberry was a bit older and sems to be have a deffect.
Wit a thin client everything runs fine.

3 Likes
5

Which thin client did you use?

6

I use a Dell WYSE 5010.
My version have Wifi build in and I upgraded the RAM to 8gb and replace the SSD with a normal SATA 120gb SSD.

7

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