i_audMan now nullable

lib_xua/api/xua_audiohub.h

@@ -24,19 +24,19 @@ typedef interface audManage_if
  *  This function drives I2S ports and handles samples to/from other digital
  *  I/O threads.
  *
- *  \param c_in Audio sample channel connected to the mixer() thread or the
+ *  \param c_aud Audio sample channel connected to the mixer() thread or the
  *              decouple() thread
  *  \param c_dig channel connected to the clockGen() thread for
  *               receiving/transmitting samples
  *  \param c_config An optional channel that will be passed on to the
  *                  CODEC configuration functions.
  */
-void XUA_AudioHub(chanend ?c_in
+void XUA_AudioHub(chanend ?c_aud
 #if defined(SPDIF_TX) && (SPDIF_TX_TILE != AUDIO_IO_TILE)
-    chanend c_spdif_tx,
+    , chanend c_spdif_tx
 #endif
 #if(defined(SPDIF_RX) || defined(ADAT_RX))
-    chanend c_dig,
+    , chanend c_dig
 #endif
 #if (XUD_TILE != 0) && (AUDIO_IO_TILE == 0) && (XUA_DFU_EN == 1)
    , server interface i_dfu ?dfuInterface
@@ -44,7 +44,7 @@ void XUA_AudioHub(chanend ?c_in
 #if (NUM_PDM_MICS > 0)
     , chanend c_pdm_in
 #endif
-    , client audManage_if i_audMan
+    , client audManage_if ?i_audMan
 );
 
 void SpdifTxWrapper(chanend c_spdif_tx);
@@ -52,9 +52,11 @@ void SpdifTxWrapper(chanend c_spdif_tx);
 /* These functions must be implemented for the CODEC/ADC/DAC arrangement of a specific design */
 
 /* Any required clocking and CODEC initialisation - run once at start up */
+/* TODO Provide default implementation of this */
 void AudioHwInit();
 
 /* Configure audio hardware (clocking, CODECs etc) for a specific mClk/Sample frquency - run on every sample frequency change */
+/* TODO Provide default implementation of this */
 void AudioHwConfig(unsigned samFreq, unsigned mClk, unsigned dsdMode,
         unsigned sampRes_DAC, unsigned sampRes_ADC);