Basic Information:
Printer Model: DIY CoreXY
MCU / Printerboard: BTT SKR 2 STM32F429
Host / SBC Raspberry Pi 4B
klippy.log
Fill out above information and in all cases attach your klippy.log file (use zip to compress it, if too big). Pasting your printer.cfg is not needed
Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there
Describe your issue:
Printer shutting down while powering up with “MCU ‘mcu’ shutdown: Timer too close” after klipper version upgrade. I upgraded the MCU in case it needed it with the same result.
Here is the first shutdown in the klipper log:
MCU ‘mcu’ shutdown: Timer too close
clocksync state: mcu_freq=168000000 last_clock=4341994199 clock_est=(392.413 4126977631 167999601.334) min_half_rtt=0.000067 min_rtt_time=392.555 time_avg=392.413(0.073) clock_avg=4126977631.748(12237923.345) pred_variance=20117551016.708
Dumping serial stats: bytes_write=3997 bytes_read=7080 bytes_retransmit=9 bytes_invalid=0 send_seq=287 receive_seq=286 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0
Dumping send queue 100 messages
klippy (8).zip (44.7 KB)
How to I downgrade klipper ? I upgraded with the Mainsail upgrade manager.
Solved by installing KIAUH and downgrading klipper