From ce4e559c01dbd20d492189d9d3e2ab7851334cb1 Mon Sep 17 00:00:00 2001
From: Alexander Begoon <alex@begoonlab.tech>
Date: Thu, 7 Aug 2025 22:30:33 +0200
Subject: [PATCH] Add support for Xiao ESP32C6 with external antenna
 configuration

---
 src/helpers/esp32/XiaoC6Board.h | 28 ++++++++++++++++++++++++++++
 variants/xiao_c6/platformio.ini |  1 +
 variants/xiao_c6/target.cpp     |  2 +-
 variants/xiao_c6/target.h       |  3 ++-
 4 files changed, 32 insertions(+), 2 deletions(-)
 create mode 100644 src/helpers/esp32/XiaoC6Board.h

diff --git a/src/helpers/esp32/XiaoC6Board.h b/src/helpers/esp32/XiaoC6Board.h
new file mode 100644
index 00000000..86c3475c
--- /dev/null
+++ b/src/helpers/esp32/XiaoC6Board.h
@@ -0,0 +1,28 @@
+#pragma once
+
+#include <Arduino.h>
+#include <helpers/ESP32Board.h>
+
+class XiaoC6Board : public ESP32Board {
+public:
+  void begin() {
+    ESP32Board::begin();
+
+#ifdef USE_XIAO_ESP32C6_EXTERNAL_ANTENNA
+// Connect an external antenna to your XIAO ESP32C6 otherwise, it may be damaged!
+    pinMode(3, OUTPUT);
+    digitalWrite(3, LOW); // Activate RF switch control
+
+    delay(100);
+
+    pinMode(14, OUTPUT);
+    digitalWrite(14, HIGH); // Use external antenna
+#endif
+  }
+
+  const char* getManufacturerName() const override {
+    return "Xiao C6";
+  }
+};
+
+
diff --git a/variants/xiao_c6/platformio.ini b/variants/xiao_c6/platformio.ini
index 9ad07aef..c27df55e 100644
--- a/variants/xiao_c6/platformio.ini
+++ b/variants/xiao_c6/platformio.ini
@@ -87,6 +87,7 @@ build_flags =
   -D SX126X_DIO3_TCXO_VOLTAGE=1.8
   -D SX126X_CURRENT_LIMIT=140
   -D SX126X_RX_BOOSTED_GAIN=1
+  -D USE_XIAO_ESP32C6_EXTERNAL_ANTENNA=1
 
 [env:Meshimi_Repeater]
 extends = Meshimi
diff --git a/variants/xiao_c6/target.cpp b/variants/xiao_c6/target.cpp
index caca57bc..ff77474a 100644
--- a/variants/xiao_c6/target.cpp
+++ b/variants/xiao_c6/target.cpp
@@ -1,7 +1,7 @@
 #include <Arduino.h>
 #include "target.h"
 
-ESP32Board board;
+XiaoC6Board board;
 
 #if defined(P_LORA_SCLK)
   static SPIClass spi(0);
diff --git a/variants/xiao_c6/target.h b/variants/xiao_c6/target.h
index c26d5958..e1469228 100644
--- a/variants/xiao_c6/target.h
+++ b/variants/xiao_c6/target.h
@@ -4,11 +4,12 @@
 #include <RadioLib.h>
 #include <helpers/radiolib/RadioLibWrappers.h>
 #include <helpers/ESP32Board.h>
+#include <helpers/esp32/XiaoC6Board.h>
 #include <helpers/radiolib/CustomSX1262Wrapper.h>
 #include <helpers/AutoDiscoverRTCClock.h>
 #include <helpers/SensorManager.h>
 
-extern ESP32Board board;
+extern XiaoC6Board board;
 extern WRAPPER_CLASS radio_driver;
 extern AutoDiscoverRTCClock rtc_clock;
 extern SensorManager sensors;