some refactoring,

minor code changes
added a small class for SNESController reading

io/GPIO.h

@@ -177,10 +177,28 @@
 		}
 
 	};
+
+#elif TEENSY
+
+	struct MyGPIO {
+		
+	public:
+	
+		static void setOutput(uint8_t pin)	{pinMode(pin, OUTPUT);}
+		
+		static void setInput(uint8_t pin)	{pinMode(pin, INPUT);}
+		
+		static void clear(uint8_t pin)		{digitalWriteFast(pin, 0);}
+		
+		static void set(uint8_t pin)		{digitalWriteFast(pin, 1);}
+		
+		static uint8_t get(uint8_t pin)		{return digitalReadFast(pin);}
+		
+	};
 	
 #else
 
-	#error "unsupported platform";
+	#error "GPIO: unsupported platform";
 
 #endif