Added optimized write(buffer,size) method in CDC class

Author: cmaglie

hardware/arduino/sam/cores/arduino/USB/CDC.cpp

@@ -211,7 +211,7 @@ void Serial_::flush(void)
 	USBD_Flush(CDC_TX);
 }
 
-size_t Serial_::write(uint8_t c)
+size_t Serial_::write(const uint8_t *buffer, size_t size)
 {
 	/* only try to send bytes if the high-level CDC connection itself
 	 is open (not just the pipe) - the OS should set lineState when the port
@@ -224,7 +224,7 @@ size_t Serial_::write(uint8_t c)
 	// or locks up, or host virtual serial port hangs)
 	if (_usbLineInfo.lineState > 0)
 	{
-		int r = USBD_Send(CDC_TX,&c,1);
+		int r = USBD_Send(CDC_TX, buffer, size);
 
 		if (r > 0)
 		{
@@ -239,6 +239,10 @@ size_t Serial_::write(uint8_t c)
 	return 0;
 }
 
+size_t Serial_::write(uint8_t c) {
+	return write(&c, 1);
+}
+
 // This operator is a convenient way for a sketch to check whether the
 // port has actually been configured and opened by the host (as opposed
 // to just being connected to the host).  It can be used, for example, in

hardware/arduino/sam/cores/arduino/USB/USBAPI.h

@@ -57,7 +57,8 @@ class Serial_ : public Stream
 	virtual int read(void);
 	virtual void flush(void);
 	virtual size_t write(uint8_t);
-	using Print::write; // pull in write(str) and write(buf, size) from Print
+	virtual size_t write(const uint8_t *buffer, size_t size);
+	using Print::write; // pull in write(str) from Print
 	operator bool();
 };
 extern Serial_ Serial;