From bbd38c439e54ea8295bc87d8c34eb5947d7dfffc Mon Sep 17 00:00:00 2001
From: ladyada <limor@ladyada.net>
Date: Sun, 1 Jun 2025 15:21:50 -0400
Subject: [PATCH] fix functionality for RP2x hosts

---
 .../SerialESPPassthrough.ino                     | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Adafruit_ESP32_Arduino_Demos/SerialESPPassthrough/SerialESPPassthrough.ino b/Adafruit_ESP32_Arduino_Demos/SerialESPPassthrough/SerialESPPassthrough.ino
index a8e9d91bb..f6fd2a323 100644
--- a/Adafruit_ESP32_Arduino_Demos/SerialESPPassthrough/SerialESPPassthrough.ino
+++ b/Adafruit_ESP32_Arduino_Demos/SerialESPPassthrough/SerialESPPassthrough.ino
@@ -109,16 +109,32 @@ void setup() {
   digitalWrite(ESP32_RESETN, HIGH);
   pixel.setPixelColor(0, 20, 20, 0); pixel.show();
   delay(100);
+
+#if defined(LED_BUILTIN)
+  pinMode(LED_BUILTIN, OUTPUT);
+#endif
 }
 
 void loop() {
   while (Serial.available()) {
+#if defined(ARDUINO_ARCH_RP2040) // Neopixel is blocking and this annoys esptool
+  #if defined(LED_BUILTIN)
+  digitalWrite(LED_BUILTIN, HIGH);
+  #endif
+#else
     pixel.setPixelColor(0, 10, 0, 0); pixel.show();
+#endif
     SerialESP32.write(Serial.read());
   }
 
   while (SerialESP32.available()) {
+#if defined(ARDUINO_ARCH_RP2040) // Neopixel is blocking and this annoys esptool
+  #if defined(LED_BUILTIN)
+  digitalWrite(LED_BUILTIN, LOW);
+  #endif
+#else
     pixel.setPixelColor(0, 0, 0, 10); pixel.show();
+#endif    
     Serial.write(SerialESP32.read());
   }
 }