Fixed gpio pin implementation and SPI chip select

include/sta/devices/arduino/gpio_pin.hpp

@@ -16,6 +16,16 @@
 
 namespace sta
 {
+	/**
+	 * @brief Describes the pin mode of the GPIO pin.
+	 * 
+	 */
+	enum class PinMode
+	{
+		GPIO_INPUT,
+		GPIO_OUTPUT
+	};
+
 	/**
 	 * @brief A wrapper class for Arduino GPIO pins.
 	 * 
@@ -24,10 +34,11 @@ namespace sta
     class ArduinoGpioPin : public GpioPin
 	{
 	public:
-		/**
-		 * @param pin   Pin index
+		/** 
+		 * @param pin Pin index
+		 * @param pinMode The pin mode
 		 */
-		ArduinoGpioPin(uint16_t pin);
+		ArduinoGpioPin(uint16_t pin, PinMode mode);
 
 		void setState(GpioPinState state) override;