cardoc
21
If I’m not mistaken the error “Timeout on connect → Serial connection closed” really means Klipper is
- Open USB serial port
- Send the very first packet: identify
- Receive nothing
- Wait 1 second
- Retry
- Eventually give up and close the port
If I’m correct that means klipper firmware is not running on the MCU. The creality 4.2.2 board is notoriously dificult to flash.
Add to that the GD32F330 is not a “mainstream” MCU.