I2S character driver now supports configurable timeouts

drivers/audio/Kconfig

@@ -15,6 +15,26 @@ config AUDIO_I2SCHAR
 		not suitable for use in any real driver application in its current
 		form.
 
+if AUDIO_I2SCHAR
+
+config AUDIO_I2SCHAR_RXTIMEOUT
+	int "RX timeout"
+	default 0
+	---help---
+		This is a fixed timeout value that will be used for all receiver
+		transfers.  This is in units of system clock ticks (configurable).
+		The special value of zero disables RX timeouts.  Default: 0
+
+config AUDIO_I2SCHAR_TXTIMEOUT
+	int "TX timeout"
+	default 0
+	---help---
+		This is a fixed timeout value that will be used for all transmitter
+		transfers.  This is in units of system clock ticks (configurable).
+		The special value of zero disables RX timeouts.  Default: 0
+
+endif #AUDIO_I2SCHAR
+
 config VS1053
 	bool "VS1053 codec chip"
 	default n

drivers/audio/i2schar.c

@@ -61,7 +61,17 @@
 /****************************************************************************
  * Private Definitions
  ****************************************************************************/
+/* Configuration ************************************************************/
 
+#ifndef CONFIG_AUDIO_I2SCHAR_RXTIMEOUT
+#  define CONFIG_AUDIO_I2SCHAR_RXTIMEOUT 0
+#endif
+
+#ifndef CONFIG_AUDIO_I2SCHAR_TXTIMEOUT
+#  define CONFIG_AUDIO_I2SCHAR_TXTIMEOUT 0
+#endif
+
+/* Device naming ************************************************************/
 #define DEVNAME_FMT    "/dev/i2schar%d"
 #define DEVNAME_FMTLEN (12 + 3 + 1)
 
@@ -268,7 +278,8 @@ static ssize_t i2schar_read(FAR struct file *filep, FAR char *buffer,
 
   /* Give the buffer to the I2S driver */
 
-  ret = I2S_RECEIVE(priv->i2s, apb, i2schar_rxcallback, priv, 0);
+  ret = I2S_RECEIVE(priv->i2s, apb, i2schar_rxcallback, priv,
+                    CONFIG_AUDIO_I2SCHAR_RXTIMEOUT);
   if (ret < 0)
     {
       i2sdbg("ERROR: I2S_RECEIVE returned: %d\n", ret);
@@ -342,7 +353,8 @@ static ssize_t i2schar_write(FAR struct file *filep, FAR const char *buffer,
 
   /* Give the audio buffer to the I2S driver */
 
-  ret = I2S_SEND(priv->i2s, apb, i2schar_txcallback, priv, 0);
+  ret = I2S_SEND(priv->i2s, apb, i2schar_txcallback, priv,
+                 CONFIG_AUDIO_I2SCHAR_TXTIMEOUT);
   if (ret < 0)
     {
       i2sdbg("ERROR: I2S_SEND returned: %d\n", ret);