Fix for USB virtual serial port in sketches of CurieI2S library

Since Arduino/Genuino 101 uses USB native port, wait for the Serial port
to open before executing the next lines of code to not lose serial data
already sent to the Serial monitor

Signed-off-by: Biagio Montaruli <biagio.hkr@gmail.com>

Author: biagiom

libraries/CurieI2S/examples/I2SDMA_RXCallBack/I2SDMA_RXCallBack.ino

@@ -37,8 +37,8 @@ uint32_t loop_count = 0; // record the higher 16 bits of received data
 uint32_t shift_count = 0; // the position of first non-zero
 void setup() 
 {
-  Serial.begin(115200);
-  while(!Serial);
+  Serial.begin(115200); // initialize Serial communication
+  while(!Serial) ;      // wait for serial port to connect.
   Serial.println("CurieI2SDMA Rx Callback");
 
   CurieI2SDMA.iniRX();
@@ -119,4 +119,4 @@ void loop()
   License along with this library; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-
   1301 USA
-*/
+*/

libraries/CurieI2S/examples/I2SDMA_TXCallBack/I2SDMA_TXCallBack.ino

@@ -15,8 +15,8 @@ uint32_t dataBuff[BUFF_SIZE];
 uint32_t loop_count = 0;
 void setup() 
 {
-  Serial.begin(115200);
-  while(!Serial);
+  Serial.begin(115200); // initialize Serial communication
+  while(!Serial) ;      // wait for serial port to connect.
   Serial.println("CurieI2SDMA Tx Callback");
 
   CurieI2SDMA.iniTX();

libraries/CurieI2S/examples/I2S_RxCallback/I2S_RxCallback.ino

@@ -23,8 +23,8 @@ volatile int count = 0;
 void setup() 
 {
   // put your setup code here, to run once:
-  Serial.begin(115200);
-  while(!Serial);
+  Serial.begin(115200); // initialize Serial communication
+  while(!Serial) ;      // wait for serial port to connect.
   Serial.println("CurieI2S Rx Callback Example");
   CurieI2S.begin(I2S_44K, I2S_32bit);
   CurieI2S.setI2SMode(PHILIPS_MODE);

libraries/CurieI2S/examples/I2S_TxCallback/I2S_TxCallback.ino

@@ -6,8 +6,8 @@
 
 void setup() 
 {
-  Serial.begin(115200);
-  while(!Serial);
+  Serial.begin(115200); // initialize Serial communication
+  while(!Serial) ;      // wait for serial port to connect.
   Serial.println("CurieI2S Tx Callback");
   CurieI2S.begin(I2S_44K, I2S_32bit);
   CurieI2S.setI2SMode(PHILIPS_MODE);