ESP32C3 UART Have no Output

Dr. 水文学家
Posts: 8
Joined: Sun Feb 27, 2022 2:14 pm

ESP32C3 UART Have no Output

Postby Dr. 水文学家 » Wed Sep 21, 2022 4:38 am

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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Schematic_Esp32-C3-Nano_ 超迷你开发板_2022-09-21.pdf
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Dr. 水文学家
Posts: 8
Joined: Sun Feb 27, 2022 2:14 pm

Re: ESP32C3 UART Have no Output

Postby Dr. 水文学家 » Wed Sep 21, 2022 4:40 am

Also, The auto download didn't work properly.[
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ESP_LJH
Posts: 387
Joined: Tue May 18, 2021 9:21 am

Re: ESP32C3 UART Have no Output

Postby ESP_LJH » Wed Sep 21, 2022 9:13 am

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
Posts: 8
Joined: Sun Feb 27, 2022 2:14 pm

Re: ESP32C3 UART Have no Output

Postby Dr. 水文学家 » Wed Sep 21, 2022 2:25 pm

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

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