work on Qt GUI, still not working properly

src/key.h

@@ -7,6 +7,11 @@
 #ifndef SRC_KEY_H_
 #define SRC_KEY_H_
 
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 //#define DEBUG_KEYS
 
 void KeyInit(void);
@@ -24,4 +29,8 @@ extern uint8_t Keys[TOTAL_ROWS]; //only bottom nibbles get set
 extern int8_t NewKeyPressed;
 
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* SRC_KEY_H_ */