ESP32C3 UART Have no Output

[Dr. 水文学家]

I designed two functions of type-c, When I switch to USB-CDC it can download normally, But When I switch to UART, it outputs nothing. what's wrong with my design?

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[Dr. 水文学家]

Also, The auto download didn't work properly.[

QQ截图20220921124019.jpg (20.96 KiB) Viewed 2072 times

[ESP_LJH]

From your schematic, you have switched UART0 two times.
Please be noted GPIO8 should be high, GPIO9 should be low, then UART download could work.
Please add 24 nH inductor at XTAL_P line.
It is suggested to read ESP32-C3 hardware design guideline to find a standard schematic of C3.

[Dr. 水文学家]

Thanks a lot! I found the Uart0 has been switched by mistake ! Also thanks for pointing the lack of inductance