Add board type check

Will throw an error if unsupposed board is selected

Author: dmadison

src/XInput.cpp

@@ -25,6 +25,20 @@
  */
 
 #include "XInput.h"
+
+// Teensy 3.1-3.2:  __MK20DX256__
+// Teensy LC:       __MKL26Z64__
+// Teensy 3.5:      __MK64FX512__
+// Teensy 3.6:      __MK66FX1M0__
+
+#if defined(TEENSYDUINO) && \
+	(defined(__MK20DX256__) || defined(__MKL26Z64__) || \
+	 defined(__MK64FX512__) || defined(__MK66FX1M0__))
+
+#else
+#error "Not a supported board! Must use Teensy 3.1/3.2, LC, 3.5, or 3.6"
+#endif
+
 #include <limits>
 
 // --------------------------------------------------------