Added new Pluggable USB structure

This commit was required to test an IDE bug

hardware/arduino/avr/cores/arduino/PluggableUSB.cpp

@@ -25,6 +25,16 @@
 
 #define MAX_MODULES	6
 
+#include "PluggableUSB.h"
+#include "USBDevice.h"
+
+PUSB_ PUSB;
+
+PUSB_::PUSB_(void)
+{
+
+}
+
 static u8 lastIf = CDC_ACM_INTERFACE + CDC_INTERFACE_COUNT;
 static u8 lastEp = CDC_FIRST_ENDPOINT + CDC_ENPOINT_COUNT;
 
@@ -97,4 +107,4 @@ int8_t PUSB_AddFunction(PUSBListNode *node, u8* interface)
 
 #endif
 
-#endif /* if defined(USBCON) */
+#endif /* if defined(USBCON) */

hardware/arduino/avr/cores/arduino/PluggableUSB.h

@@ -48,6 +48,21 @@ class PUSBListNode {
   PUSBListNode(PUSBCallbacks *ncb) {cb = ncb;}
 };
 
+class USBDevice;
+
+class PUSB_
+{
+public:
+  PUSB_(void);
+
+  // Only access this class via the USBDevice
+private:
+  friend USBDevice;
+  void AppendDescriptor(USBDevice* device);
+
+  // TODO add root device, search functions etc
+};
+
 int8_t PUSB_AddFunction(PUSBListNode *node, u8 *interface);
 
 int PUSB_GetInterface(u8* interfaceNum);

hardware/arduino/avr/cores/arduino/USBDevice.cpp

@@ -0,0 +1,16 @@
+
+#include "USBDevice.h"
+#include "PluggableUSB.h"
+
+#if defined(USBCON)	
+#ifdef PLUGGABLE_USB_ENABLED
+
+USBDevice::USBDevice(void)
+{
+    //PUSB.AppendDescriptor(this);
+}
+
+
+#endif
+
+#endif /* if defined(USBCON) */

hardware/arduino/avr/cores/arduino/USBDevice.h

@@ -0,0 +1,27 @@
+// Include guard
+#pragma once
+
+#define HID_h
+
+#include <stdint.h>
+#include <Arduino.h>
+
+//http://stackoverflow.com/questions/1837165/can-two-classes-see-each-other-using-c
+
+class PUSB_;
+extern PUSB_ PUSB;
+
+class USBDevice
+{
+public:
+  USBDevice(void);
+
+  // Needs to be public for static PUSB_ function access
+  // Inherit this device private and everything should be fine
+//private:
+  USBDevice* next = NULL;
+
+
+protected:
+
+};