Copter: minor user hooks cleanup

Only define and call functions if the appropriate #define in
APM_Config.h has been added

ArduCopter/APM_Config.h

@@ -24,11 +24,11 @@
 
 // User Hooks : For User Developed code that you wish to run
 // Put your variable definitions into the UserVariables.h file (or another file name and then change the #define below).
-#define USERHOOK_VARIABLES "UserVariables.h"
+//#define USERHOOK_VARIABLES "UserVariables.h"
 // Put your custom code into the UserCode.pde with function names matching those listed below and ensure the appropriate #define below is uncommented below
-#define USERHOOK_INIT userhook_init();                      // for code to be run once at startup
+//#define USERHOOK_INIT userhook_init();                      // for code to be run once at startup
 //#define USERHOOK_FASTLOOP userhook_FastLoop();            // for code to be run at 100hz
-#define USERHOOK_50HZLOOP userhook_50Hz();                  // for code to be run at 50hz
+//#define USERHOOK_50HZLOOP userhook_50Hz();                  // for code to be run at 50hz
 //#define USERHOOK_MEDIUMLOOP userhook_MediumLoop();        // for code to be run at 10hz
 //#define USERHOOK_SLOWLOOP userhook_SlowLoop();            // for code to be run at 3.3hz
 //#define USERHOOK_SUPERSLOWLOOP userhook_SuperSlowLoop();  // for code to be run at 1hz

ArduCopter/UserCode.pde

@@ -1,13 +1,44 @@
+/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
+
+#ifdef USERHOOK_INIT
 void userhook_init()
 {
     // put your initialisation code here
+    // this will be called once at start-up
+}
+#endif
 
-
+#ifdef USERHOOK_FASTLOOP
+void userhook_FastLoop()
+{
+    // put your 100Hz code here
 }
+#endif
 
+#ifdef USERHOOK_50HZLOOP
 void userhook_50Hz()
 {
     // put your 50Hz code here
+}
+#endif
 
+#ifdef USERHOOK_MEDIUMLOOP
+void userhook_MediumLoop()
+{
+    // put your 10Hz code here
+}
+#endif
 
+#ifdef USERHOOK_SLOWLOOP
+void userhook_SlowLoop()
+{
+    // put your 3.3Hz code here
+}
+#endif
+
+#ifdef USERHOOK_SUPERSLOWLOOP
+void userhook_SuperSlowLoop()
+{
+    // put your 1Hz code here
 }
+#endif

ArduCopter/UserVariables.h

@@ -1,13 +1,19 @@
+/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
+
 // user defined variables
 
 // example variables used in Wii camera testing - replace with your own
 // variables
+#ifdef USERHOOK_VARIABLES
+
 #if WII_CAMERA == 1
 WiiCamera           ircam;
 int                 WiiRange=0;
 int                 WiiRotation=0;
 int                 WiiDisplacementX=0;
 int                 WiiDisplacementY=0;
-#endif
+#endif  // WII_CAMERA
+
+#endif  // USERHOOK_VARIABLES