The computer does not recognize the CH340N download circuit. It will recognize it but there is an exclamation mark. However, I drew it according to the training camp case.
Unreasonable trace distribution and too many vias
It is planned to remove the serial port download circuit and use a downloader to download and debug, which is safe and convenient.
I didn't know how to use Linux at the time, but now I know how to do it. I go back to school to catch up!
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