Upload Error

[n7qnm]

Using PIOARDUINO and VSCODE - build went fine
Devices says:
COM3

Hardware ID: USB VID:PID=1A86:7523 SER= LOCATION=1-2
Description: USB-SERIAL CH340 (COM3)

Upload says
Traceback (most recent call last):
File "C:\Users\clayj.platformio\packages\tool-esptoolpy\esptool.py", line 3969, in
_main()
~~~~~^^
File "C:\Users\clayj.platformio\packages\tool-esptoolpy\esptool.py", line 3962, in _main
main()
~~~~^^
File "C:\Users\clayj.platformio\packages\tool-esptoolpy\esptool.py", line 3551, in main
esp = chip_class(each_port, initial_baud, args.trace)
File "C:\Users\clayj.platformio\packages\tool-esptoolpy\esptool.py", line 283, in init
self._port.write_timeout = DEFAULT_SERIAL_WRITE_TIMEOUT
^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\clayj.platformio\penv\Lib\site-packages\serial\serialutil.py", line 392, in write_timeout
self._reconfigure_port()
~~~~~~~~~~~~~~~~~~~~~~^^
File "C:\Users\clayj.platformio\penv\Lib\site-packages\serial\serialwin32.py", line 222, in _reconfigure_port
raise SerialException(
'Cannot configure port, something went wrong. '
'Original message: {!r}'.format(ctypes.WinError()))
serial.serialutil.SerialException: Cannot configure port, something went wrong. Original message: PermissionError(13, 'A device attached to the system is not functioning.', None, 31)
*** [upload] Error 1

[rob040]

I don't know, but my guess is that you have not installed a correct CH340 driver or the COM3 port is in use by another process.
Check your PC; 'A device attached to the system is not functioning.'

[n7qnm]

Tried everything I knew or could find on the web to fix – nothing worked! I “solved” the immediate problem by switching to OTA updates. Any further suggestions welcome. Thanks! From: rob040 ***@***.***> Sent: Friday, September 26, 2025 1:19 PM To: rob040/LEDmatrixClock ***@***.***> Cc: n7qnm ***@***.***>; Author ***@***.***> Subject: Re: [rob040/LEDmatrixClock] Upload Error (Discussion #26) I don't know, but my guess is that you have not installed a correct CH340 driver or the COM3 port is in use by another process. Check your PC; 'A device attached to the system is not functioning.' — Reply to this email directly, view it on GitHub <#26 (comment)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/AGDARKPGJN6BGGNNS7CNSFT3UWNUVAVCNFSM6AAAAACGPXLF7KVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTINJSGU4TCOI> . You are receiving this because you authored the thread. <https://github.com/notifications/beacon/AGDARKIIF7POBUKPATFGX7L3UWNUVA5CNFSM6AAAAACGPXLF7KWGG33NNVSW45C7OR4XAZNRIRUXGY3VONZWS33OINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQA3WS56.gif> Message ID: ***@***.*** ***@***.***> >

[rob040]

Are you able to use the Com port for serial communication?
Are you able to read the serial output in VScode serial monitor ?
What does the Windows device manager say?

There are Wemos D1 clone boards with faulty voltage regulators. Those can't supply the peak current the ESP8266 needs.
The same goes for the serial chips. When buying in China, sometimes you get burned.

If you can, try another Wemos D1 board.