Doc updates

module_usb_audio/clocking/clocking.h

@@ -0,0 +1,27 @@
+
+#ifndef _CLOCKING_H_
+#define _CLOCKING_H_
+
+/* Functions that handle master clock generation.  These need modifying for an existing design */
+
+/* Any initialisation required for master clock generation - run once at start up */
+void ClockingInit(chanend ?c);
+
+/* Configuration for a specific master clock frequency - run every sample frequency change */
+void ClockingConfig(unsigned mClkFreq, chanend ?c);
+
+
+/** Clock generation and digital audio I/O handling.
+ *
+ *  \param c_spdif_rx channel connected to S/PDIF receive thread
+ *  \param c_adat_rx channel connect to ADAT receive thread
+ *  \param p port to output clock signal to drive external frequency synthesizer
+ *  \param c_audio channel connected to the audio() thread
+ *  \param c_clk_ctl channel connected to Endpoint0() for configuration of the 
+ *                   clock
+ *  \param c_clk_int channel connected to the decouple() thread for clock
+                     interrupts
+ */
+void clockGen (streaming chanend c_spdif_rx, chanend c_adat_rx, out port p, chanend c_audio, chanend c_clk_ctl, chanend c_clk_int);
+#endif
+