QUERY · ISSUE

ESP32-C6, ESP32-S3, etc.: MICROPY_HW_ENABLE_UART_REPL should be disabled for boards that have both direct USB and UART connectors

openby bikeNomadopened 2025-07-13updated 2025-08-10

enhancementport-esp32

Description

On many ESP32 boards, there are two USB connectors: one connected directly to the MCU and the other connected via a USB/UART bridge chip.

The default ESP32 build for these boards puts the REPL on both ports, making it impossible to use the USB/UART connector as an independent UART for other purposes.

See discussion at #17633 .

Code Size

No response

Implementation

I hope the MicroPython maintainers or community will implement this feature

Code of Conduct

Yes, I agree

CANDIDATE · ISSUE

ESP32-C3 CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=y disables repl on USB

closedby bdambrosioopened 2022-05-06updated 2022-05-06

On my ESP32-C3 boards (AI-Thinker, Espressif esp32-c3 devkit, and Espressif esp32-c3-wroom), I could only get repl on the uart RX/TX pins using the default GENERIC_C3_USB board defs.

I had to change to
CONFIG_ESP_CONSOLE_UART_DEFAULT=y
CONFIG_ESP_CONSOLE_USB_CDC=y
CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=

and now I get repl on the USB.
Shouldn't this be the default, or am I missing something?

Assessment

Q Qwen · high

Both issues concern ESP32 USB/UART REPL configuration, but they address different problems. Issue #17672 requests a feature to disable UART REPL on boards with dual USB connectors (direct MCU USB + UART bridge) so the UART bridge can be used independently. Issue #8640 reports a bug where USB REPL doesn't work on ESP32-C3 boards due to incorrect default CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG settings. While both involve ESP32 USB/UART console configuration, they have different root causes and solutions: #17672 is about board-specific configuration logic, while #8640 is about fixing default SDK configuration for USB CDC support.

Suggested action

Keep both issues open as they address different problems. #17672 is a feature request for configurable UART REPL disabling, while #8640 is a bug report about USB REPL not working on specific ESP32-C3 boards.