Delete Adafruit's DCD, add stubs for missing DCD functions, use ESP32 core DCD

extra_script.py

@@ -1,3 +1,25 @@
 Import("env")
+import os
 
+# Keep allow-multiple-definition for core TinyUSB symbol overlaps
 env.Append(LINKFLAGS=["-Wl,--allow-multiple-definition"])
+
+# Delete the Adafruit library's generic DCD so the ESP32 core's
+# patched version from libarduino_tinyusb.a is used instead.
+# We provide stubs (src/dcd_stubs.c) for the few ISO/SOF functions
+# the ESP32 core's older DCD doesn't implement.
+lib_path = os.path.join(
+    env.subst("$PROJECT_DIR"),
+    ".pio", "libdeps", env.subst("$PIOENV"),
+    "Adafruit TinyUSB Library", "src"
+)
+
+dcd_path = os.path.join(lib_path, "portable", "synopsys", "dwc2", "dcd_dwc2.c")
+backup = dcd_path + ".bak"
+
+if os.path.exists(dcd_path):
+    # Rename .c -> .bak so the build system doesn't compile it
+    os.rename(dcd_path, backup)
+    print("[extra_script] Renamed dcd_dwc2.c -> dcd_dwc2.c.bak (using ESP32 core DCD + project stubs)")
+else:
+    print("[extra_script] dcd_dwc2.c not found at:", dcd_path)