Modified GpioPin to offer PinState reading

include/sta/gpio_pin.hpp

@@ -37,6 +37,13 @@ namespace sta
          * @param state     Output state
          */
         virtual void setState(GpioPinState state) = 0;
+
+        /**
+         * @brief Get pin input state.
+         *
+         * @param state     Input state
+         */
+        virtual GpioPinState getState() = 0;
     };
 
 

include/sta/raspi/gpio_pin.hpp

@@ -31,6 +31,8 @@ namespace sta
 
         void setState(GpioPinState state) override;
 
+        GpioPinState getState() override;
+
         static RaspiGpioPin * DUMMY_GPIO;
         
     private: