Add LED_BUILTIN* definitions and initialization for LEDs to stop them floating. (#7636)

Co-authored-by: Rodrigo Garcia <rodrigo.garcia@espressif.com>

variants/AirM2M_CORE_ESP32C3/pins_arduino.h

@@ -11,6 +11,10 @@
 #define digitalPinToInterrupt(p)    (((p)<NUM_DIGITAL_PINS)?(p):-1)
 #define digitalPinHasPWM(p)         (p < EXTERNAL_NUM_INTERRUPTS)
 
+static const uint8_t LED_BUILTIN     = 12;
+#define BUILTIN_LED  LED_BUILTIN
+static const uint8_t LED_BUILTIN_AUX = 13;
+
 static const uint8_t TX = 21;
 static const uint8_t RX = 20;
 

variants/AirM2M_CORE_ESP32C3/variant.cpp

+#include "Arduino.h"
+
+extern "C" void initVariant(void){
+	// Stop LEDs floating
+	pinMode(LED_BUILTIN, OUTPUT); digitalWrite(LED_BUILTIN, LOW);
+	pinMode(LED_BUILTIN_AUX, OUTPUT); digitalWrite(LED_BUILTIN_AUX, LOW);
+}
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