Doc updates

module_usb_audio/usb_buffer/decouple.h

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+#ifndef __decouple_h__
+#define __decouple_h__
+
+
+/** Manage the data transfer between the USB audio buffer and the 
+ *  Audio I/O driver.
+ *  
+ * \param c_audio_out Channel connected to the audio() or mixer() threads
+ * \param c_led Optional chanend connected to an led driver thread for
+ *              debugging purposes
+ * \param c_midi Optional chanend connect to usb_midi() thread if present
+ * \param c_clk_int Optional chanend connected to the clockGen() thread if present
+ */
+void decouple(chanend c_audio_out,
+             // chanend ?c_midi, 
+              chanend ?c_clk_int
+#ifdef IAP
+, chanend ?c_iap
+#endif
+);
+
+#endif // __decouple_h__