Enabled the onboard ceramic antenna by default when creating a new project with XIAO_ESP32C6 (#10066)

* Create variant.cpp

* Update variant.cpp

* Update variant.cpp

* Update pins_arduino.h

* Update variant.cpp

* Update variant.cpp

* Update variant.cpp

* Update variants/XIAO_ESP32C6/variant.cpp

Co-authored-by: Jan Procházka <[email protected]>

* ci(pre-commit): Apply automatic fixes

---------

Co-authored-by: Jan Procházka <[email protected]>
Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>

Author: 3 people

variants/XIAO_ESP32C6/pins_arduino.h

@@ -41,4 +41,7 @@ static const uint8_t D8 = 19;
 static const uint8_t D9 = 20;
 static const uint8_t D10 = 18;
 
+static const uint8_t WIFI_ENABLE = 3;
+static const uint8_t WIFI_ANT_CONFIG = 14;
+
 #endif /* Pins_Arduino_h */

variants/XIAO_ESP32C6/variant.cpp

@@ -0,0 +1,21 @@
+/*
+*By setting the WIFI_ENABLE and WIFI_ANT_CONFIG pins,
+*
+*the XIAO_ESP32C6 will turn on the on-board antenna by default after power-on
+*
+*https://wiki.seeedstudio.com/xiao_esp32c6_getting_started/
+*/
+
+#include "esp32-hal-gpio.h"
+#include "pins_arduino.h"
+
+extern "C" {
+
+void initVariant(void) {
+  pinMode(WIFI_ENABLE, OUTPUT);
+  digitalWrite(WIFI_ENABLE, LOW);  //turn on this function
+
+  pinMode(WIFI_ANT_CONFIG, OUTPUT);
+  digitalWrite(WIFI_ANT_CONFIG, LOW);  //use built-in antenna, set HIGH to use external antenna
+}
+}