purple: add the remaining hw defines for purple hardware

ArduPlane/config.h

@@ -48,10 +48,18 @@
 
 #ifndef CONFIG_APM_HARDWARE
 # define CONFIG_APM_HARDWARE APM_HARDWARE_APM1
-#else
-# if CONFIG_APM_HARDWARE == APM_HARDWARE_PURPLE
-#  define CONFIG_IMU_TYPE CONFIG_IMU_MPU6000
-# endif
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+// PURPLE HARDWARE DEFAULTS
+//
+
+#if CONFIG_APM_HARDWARE == APM_HARDWARE_PURPLE
+# define CONFIG_IMU_TYPE   CONFIG_IMU_MPU6000
+# define CONFIG_PUSHBUTTON DISABLED
+# define CONFIG_RELAY      DISABLED
+# define MAG_ORIENTATION   ROTATION_NONE
+# define CONFIG_SONAR_SOURCE SONAR_SOURCE_ANALOG_PIN
 #endif
 
 //////////////////////////////////////////////////////////////////////////////

ArduPlane/system.pde

@@ -197,10 +197,15 @@ static void init_ardupilot()
 	pinMode(C_LED_PIN, OUTPUT);			// GPS status LED
 	pinMode(A_LED_PIN, OUTPUT);			// GPS status LED
 	pinMode(B_LED_PIN, OUTPUT);			// GPS status LED
+#if SLIDE_SWITCH_PIN > 0
 	pinMode(SLIDE_SWITCH_PIN, INPUT);	// To enter interactive mode
+#endif
+#if CONFIG_PUSHBUTTON == ENABLED
 	pinMode(PUSHBUTTON_PIN, INPUT);		// unused
+#endif
+#if CONFIG_RELAY == ENABLED
 	DDRL |= B00000100;					// Set Port L, pin 2 to output for the relay
-
+#endif
 	// If the switch is in 'menu' mode, run the main menu.
 	//
 	// Since we can't be sure that the setup or test mode won't leave