ESP32 S2 Mini - How to use USB as Serial (CDC?)?

[euphi]

The ESP32 S2 Mini Boards seem to not support the Serial device by USB. When I compile with latest released framework (3.20017.0 / older versions not tried) the device does not show up as USB device at all (there is also no "unknown" USB device) (It only switches to USB mode if resetted to "Boot" mode)

How can I use the CDC mode in a way that is available as Serial? Manually creating a CDCSerial object in main.cpp does not help, because some libraries directly access Serial for debug (e.g. ESP Async WebServer).

If I enable the build flag -DARDUINO_USB_CDC_ON_BOOT=1, I get compiler errors that Serial is not defined at all?

I somehow assume that the ESP-IDF underlying the Arduino framework is not configured to support CDC by default? Is there a way to change it?

platformio.ini

[platformio]
default_envs = esp32s2

[common]
build_flags =
        -DASYNCWEBSERVER_REGEX
        -DDEBUG_APP
        -DCORE_DEBUG_LEVEL=4
        -DHOMIE_CONFIG=0

[env]
framework = arduino
board_build.filesystem = littlefs
lib_deps = symlink://../homie-esp8266
upload_speed = 460800

[env:esp32s2]
platform = espressif32
board = nodemcu-32s2
build_flags=
        ${common.build_flags}
        -DARDUINO_USB_MODE=1
        ;-DARDUINO_USB_CDC_ON_BOOT=1

Installed versions:

Platform espressif32 @ 6.8.1 (required: espressif32)
├── framework-arduinoespressif32 @ 3.20017.241212+sha.dcc1105b (required: platformio/framework-arduinoespressif32 @ ~3.20017.0)
├── tool-esptoolpy @ 1.40501.0 (required: platformio/tool-esptoolpy @ ~1.40501.0)
├── tool-mkfatfs @ 2.0.1 (required: platformio/tool-mkfatfs @ ~2.0.0)
├── tool-mklittlefs @ 1.203.210628 (required: platformio/tool-mklittlefs @ ~1.203.0)
├── tool-mkspiffs @ 2.230.0 (required: platformio/tool-mkspiffs @ ~2.230.0)
├── toolchain-riscv32-esp @ 8.4.0+2021r2-patch5 (required: espressif/toolchain-riscv32-esp @ 8.4.0+2021r2-patch5)
└── toolchain-xtensa-esp32s2 @ 8.4.0+2021r2-patch5 (required: espressif/toolchain-xtensa-esp32s2 @ 8.4.0+2021r2-patch5)

Libraries
└── Homie @ 3.0.1 (required: symlink://../homie-esp8266)
│   ├── ArduinoJson @ 6.11.5 (required: ArduinoJson @ ~6.11.4)
│   ├── AsyncMqttClient @ 0.8.2 (required: AsyncMqttClient @ ^0.8.0)
│   │   └── AsyncTCP @ 1.1.1 (required: AsyncTCP @ ^1.0.0)
│   ├── Bounce2 @ 2.72.0 (required: Bounce2 @ ^2.1.0)
│   └── ESP Async WebServer @ 1.2.4 (required: ESP Async WebServer)

[me-no-dev]

try:

-DARDUINO_USB_MODE=0
-DARDUINO_USB_CDC_ON_BOOT=1

[euphi]

TBH, I thought I also tried this. However, it seems i did not - because your solution works fine. Many thanks.