Klipper on Mellow SHT42 - problem with print

General Discussion
1

I’m having trouble getting the klipper to work on Mellow’s sht42 board.
At the end of printing, when executing the final gcode, the klipper goes into error MCU ‘sht42’ shutdown: Timer too close
The model is fully printed.
Hardware:
Orange Pi zero 2 1gb
main mcu SKR 1.3
Print head mcu Mellow SHT42 connected via CAN bus
USB-CAN MKS CANable
CAN settings:
auto can0
iface can0 can static
bitrate 500000
klippy.log (2.3 MB)

up ifconfig $IFACE txqueuelen 1024

2

loadgraph
loadgraph800×600 56.1 KB

Quote from the log:

Resetting prediction variance 328780.762: freq=47999591 diff=290202 stddev=2188.218

This log is a bit over my pay grade, so just spitballing:

  • The graph looks like having high memory usage with a big spike at the end and a sudden drop. Could be a swapping event, which might explain the error
  • The Resetting prediction variance is a significant error. Could be the host clock being off