Diy stm32f103cbt6 (apm32 ) klipper can not connect

I made a 3D print motherboard for the APM32CBT6 (compatible with the firmware of STM32) and an APM32 development board.

Now the develop board can be recognized normally when flashed into the Klipper firmware.

But the 3D printe motherboard flashed into the same Klipper firmware can not be recognized,

The 3D printed motherboard can use the timer, external 8M crystal oscillator, and serial port ,adc, normally using my separately compiled firmware .

But the fluiid web page doesn’t recognize the 3D printed motherboard.

PLS HELP

Can identify the serial port of apm32 3d printing motherboard

This is the log record file that I tried to connect after deleting the previous logs and connecting to the apm32 3d printing motherboard
klippy (15).log (26.9 KB)

mcu ‘mcu’: Starting serial connect
webhooks client 281473724133856: New connection
webhooks client 281473724133856: Client info {‘program’: ‘Moonraker’, ‘version’: ‘v0.7.1-56-g2447cca’}
mcu ‘mcu’: Timeout on connect
mcu ‘mcu’: Wait for identify_response
Traceback (most recent call last):
File “/home/my/klipper/klippy/serialhdl.py”, line 69, in _get_identify_data
params = self.send_with_response(msg, ‘identify_response’)
File “/home/my/klipper/klippy/serialhdl.py”, line 258, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File “/home/my/klipper/klippy/serialhdl.py”, line 316, in get_response
cmd_queue)
File “/home/my/klipper/klippy/serialhdl.py”, line 250, in raw_send_wait_ack
self._error(“Serial connection closed”)
File “/home/my/klipper/klippy/serialhdl.py”, line 62, in _error
raise error(self.warn_prefix + (msg % params))
error: mcu ‘mcu’: Serial connection closed
mcu ‘mcu’: Timeout on connect
mcu ‘mcu’: Wait for identify_response
Traceback (most recent call last):
File “/home/my/klipper/klippy/serialhdl.py”, line 69, in _get_identify_data
params = self.send_with_response(msg, ‘identify_response’)
File “/home/my/klipper/klippy/serialhdl.py”, line 258, in send_with_response
return src.get_response([cmd], self.default_cmd_queue)
File “/home/my/klipper/klippy/serialhdl.py”, line 316, in get_response
cmd_queue)
File “/home/my/klipper/klippy/serialhdl.py”, line 250, in raw_send_wait_ack
self._error(“Serial connection closed”)
File “/home/my/klipper/klippy/serialhdl.py”, line 62, in _error
raise error(self.warn_prefix + (msg % params))
error: mcu ‘mcu’: Serial connection closed
Attempting MCU ‘mcu’ reset
webhooks client 281473724133856: Disconnected
Restarting printer