From 7addae9c244c82c0dfb15d72acab7f30be8936a8 Mon Sep 17 00:00:00 2001
From: Frank <91616163+softhack007@users.noreply.github.com>
Date: Mon, 10 Nov 2025 16:52:24 +0100
Subject: [PATCH] restore missing build flag for esp32

this flag got lost between 0.15 and 0.16.

Even when NO classic esp32 has USB-CDC., it seems that omitting the flag can cause strange behavior in the arduino-esp32 framework.
---
 platformio.ini | 1 +
 1 file changed, 1 insertion(+)

diff --git a/platformio.ini b/platformio.ini
index c51a38be..45c62843 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -294,6 +294,7 @@ build_flags = -g
   -Wshadow=compatible-local ;; emit warning in case a local variable "shadows" another local one
   -DARDUINO_ARCH_ESP32 -DESP32
   ${esp32_all_variants.build_flags}
+  -DARDUINO_USB_CDC_ON_BOOT=0 ;; this flag is mandatory for "classic ESP32" when building with arduino-esp32 >=2.0.3
   -D WLED_ENABLE_DMX_INPUT
 lib_deps =
   ${esp32_all_variants.lib_deps}