ESP32 C3 UART USB problem

[stefan.erni]

Hi to All

I have the ESP32 C3
I can compile and download to target and it's running
(no press of reset and boot)
I use the GPIO18 and GPIO19 like the schema for UART/USB
But as soon as I switch on the Uart in FC10 and flash I can not connect anymore the ESP to the computer,
there is no com port anymore also not in the terminalprogram.
For the next flash I need to press reset and boot first

https://docs.espressif.com/projects/esp ... ction.html

SNAG-0017.PNG (352.94 KiB) Viewed 89 times

2025-07-09_10-44-55.PNG (89.89 KiB) Viewed 89 times

2025-07-08_16-09-56.PNG (200.53 KiB) Viewed 89 times

[BenR]

Hello,

It looks like on that device there may not be a UART to USB bridge IC and so they expect you to use the USB peripheral as the comms. We don't currently support the USB on the ESP32 devices but I could add it to the list to investigate if that would help.

[stefan.erni]

Hi Ben

UART to USB bridge IC are often relatively large so that they are missing in the very small board.
Yes, that would be very good if it follows in a few weeks.
I am always ready to test it.
I think we will also look at the App Developper to have an easy to use and very fast USB connection for the ESP32 (without UART to USB bridge).

[BenR]

Hi Stefan,

I've made a good start with this now and aim to finish it off next week in between doing other things.

Atm it's looking very good and easy to implement and will become part of the standard USB Serial component.