QUERY · ISSUE

ESP32-S2 2nd usb-serial port

openby emardopened 2021-11-26updated 2021-11-29

port-esp32

At micropython for ESP32-S2, I'd like to have
secondary USB-serial port (like /dev/ttyACM1 on linux)
which directly maps to board's hardware serial port
RX/TX pins and if possible, few RS232 signaling lines.

Can this (easily) be done?

CANDIDATE · ISSUE

esp32s3 USB JTAG Serial interface should be enabled to access the mpy terminal

closedby wuyuanyi135opened 2022-05-20updated 2025-02-04

bugport-esp32needs-info

Problem Description

I want to use the built-in USB serial functionality comes with the ESP32-S3 SoC in addition to the UART interface (not simultaneously). However, I found that the firmwares (both v1.18 (2022-01-17) .bin and v1.18-473-g7883ae413 (2022-05-19) .bin do not support the serial over USB JTAG Serial interface. The sympton was that the device got reset as soon as I opened the USB serial port.

I compile my own firmware using the master branch
(7883ae413ddfa6181d784533b236658658383d0c) with

make -C mpy-cross 
make  -C ports/esp32 SER_C_MODULES=../../../examples/usercmodule/micropython.cmake  FROZEN_MANIFEST=$(pwd)/ports/esp32/boards/manifest_test.py BOARD=GENERIC_S3_SPIRAM
make -C ports/esp32 submodules BOARD=GENERIC_S3_SPIRAM
make -C ports/esp32  BOARD=GENERIC_S3_SPIRAM

and flashed the firmware with

python -m esptool --chip esp32s3 -b 460800 --before default_reset --after no_reset --chip esp32s3  write_flash  0x0 bui
ld-GENERIC_S3_SPIRAM/bootloader/bootloader.bin 0x8000 build-GENERIC_S3_SPIRAM/partition_table/partition-table.bin 0x10000 build-GENERIC_S3_SPIRAM/micropython.bin

The USB serial no longer reset the board. However, the USB Serial terminal has no feedback: I can see from the UART terminal that the input was accepted (e.g., more >>> after hit the enter key) but nothing showed up in the USB Terminal.

Solution

I have added one line to micropython/ports/esp32/boards/GENERIC_S3_SPIRAM/sdkconfig.board file:

CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=y

And the USB terminal works just fine. It is shared by the UART one but both side will see the same feedback consistently.

In addition, I have tried to comment out the line inmicropython/ports/esp32/boards/GENERIC_S3_SPIRAM/mpconfigboard.cmake:

set(IDF_TARGET esp32s3)

set(SDKCONFIG_DEFAULTS
    boards/sdkconfig.base
#    boards/sdkconfig.usb
    boards/sdkconfig.spiram_sx
    boards/GENERIC_S3_SPIRAM/sdkconfig.board
)

And the USB terminal still works.

Below is the screen record of how two terminals are working simultaneously. The left panel (COM4) is CH340 USB Serial bridge and the right one (COM5) uses the internal USB JTAG Serial.

Animation

Recommendations

Add CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=y to the esp32s3 boards so that the USB serial will be enabled.

Possible related issues

#8524