Refactoring menu code to be non-blocking

Added macros for GPIO read/write

source/menu.h

@@ -60,20 +60,28 @@
 
 #define MENU_SEL_RECT_RADIUS		5
 
-typedef struct {
-	bool exitToMainScreen;
-}MENU_t;
+typedef enum
+{
+	MENU_ID_NONE = 0,
+	MENU_ID_AUTOSHUTDOWN,
+	MENU_ID_FREQUENCIES,
+	MENU_ID_SYSINFO,
+	MENU_ID_LANGUAGE,
 
+} MenuItemId_t;
 
-//Menu Item Struct
-//contains pointers to both mono and color bitmaps. mono bitmap requires a color.
-//each item may have a mono bitmap, a color bitmap, or no bitmap.
-typedef struct {
-
-	uint16_t * pMonoIcon;				// bitmap
+typedef struct MENU_ITEM_s
+{
+	uint32_t * pMonoIcon;				// bitmap
 	char text[MENU_MAX_STRING_LENGTH];
-}MENU_ITEM_t;
+	MenuItemId_t id;
 
+} MENU_ITEM_t;
+
+
+void Menu_init(void);
+void Menu_mainMenu(void);
+void Menu_service(void);
 
 void MENU_Init(void);
 void MENU_Main(void);