attempt to reduce space usage

- remove unecessary code
- ifdef "extra" code
- pass data through globals instead of functions accessing static data
- functions non-reentrant, locate tmps in xdata

src/key.h

@@ -7,10 +7,20 @@
 #ifndef SRC_KEY_H_
 #define SRC_KEY_H_
 
+//#define DEBUG_KEYS
+
 void KeyInit(void);
 void KeyScan(void);
-const uint8_t* DebugGetKeys(void);
 const uint32_t GetNewKeys(void);
 
+#ifdef DEBUG_KEYS
+const uint8_t* DebugGetKeys(void);
+#endif
+
+//definition included for determining if multiple keys are pressed
+//prefer using GetNewKeys();
+#define TOTAL_ROWS 5
+extern uint8_t Keys[TOTAL_ROWS]; //only bottom nibbles get set
+
 
 #endif /* SRC_KEY_H_ */