Build flag -DARDUINO_USB_MODE=1 fails

PlatformIO IDE
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1

Building an Arduino project for a self-built ESP32 S2 board.
Project compiles just fine, but when adding the build flag
-DARDUINO_USB_MODE=1
it fails with the following error message

In file included from /Users/julian/.platformio/packages/framework-arduinoespressif32/cores/esp32/Arduino.h:197,
from src/main.cpp:1:
src/main.cpp: In function ‘void printMessage(int)’:
/Users/julian/.platformio/packages/framework-arduinoespressif32/cores/esp32/HardwareSerial.h:356:16: error: ‘HWCDCSerial’ was not declared in this scope
356 | #define Serial HWCDCSerial

and a bunch of repetitions of the same.

I’m a little out of my depth here. Without the flag the ESP won’t register as an USB device, so i have no serial connection when not in Boot mode.
Happy to hear any pointers.

2

Please show the complete content of your platformio.ini
Especially the board setting would be of interest.

3

turns out, setting the flag to 0 actually works. and i have absolutely no idea why, but thanks, i consider this solved :wink: