Doc updates

module_usb_audio/usb_buffer/usb_buffer.h

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+#ifndef __usb_buffer_h__
+#define __usb_buffer_h__
+/** USB Audio Buffering Thread.
+ *
+ *  This function buffers USB audio data between the XUD layer and the decouple
+ *  thread. Most of the chanend parameters to the function should be connected to
+ *  XUD_Manager()
+ *
+ *  \param c_aud_out Audio OUT endpoint channel connected to the XUD
+ *  \param c_aud_in  Audio IN endpoint channel connected to the XUD
+ *  \param c_aud_fb  Audio feedback endpoint channel connected to the XUD
+ *  \param c_midi_from_host  MIDI OUT endpoint channel connected to the XUD
+ *  \param c_midi_to_host  MIDI IN endpoint channel connected to the XUD
+ *  \param c_int  Audio clocking interrupt endpoint channel connected to the XUD
+ *  \param c_sof  Start of frame channel connected to the XUD
+ *  \param c_aud_ctl Audio control channel connected to  Endpoint0()
+ *  \param p_off_mclk A port that is clocked of the MCLK input (not the MCLK input itself)
+ */
+void buffer(chanend c_aud_out, 
+            chanend c_aud_in, 
+            chanend c_aud_fb,
+#ifdef MIDI 
+            chanend c_midi_from_host, 
+            chanend c_midi_to_host,
+			chanend c_midi,
+#endif
+#ifdef IAP
+#error IAP
+            chanend c_iap_from_host, 
+            chanend c_iap_to_host,
+            chanend c_iap_to_host_int,
+#endif
+            chanend? c_int, 
+            chanend c_sof, 
+            chanend c_aud_ctl,
+            in port p_off_mclk
+#ifdef HID_CONTROLS
+            ,chanend c_hid
+#endif
+        );
+#endif