added asynchronous buffering of received CDC characters

This fixes the issue Federico reported where bytes written by host but not read by sketch would cause serial connection to lock up.  Ring buffer implementation is based on HardwareSerial.cpp.

Adds public accept() method to CDC.

1 files changed, 3 insertions, 0 deletions

diff --git a/cores/arduino/USBAPI.h b/cores/arduino/USBAPI.h
index 26a2032..1772c3c 100644
--- a/cores/arduino/USBAPI.h
+++ b/cores/arduino/USBAPI.h
@@ -27,11 +27,14 @@ extern USB_ USB;
 
 class Serial_ : public Stream
 {
+private:
+	ring_buffer *_cdc_rx_buffer;
 public:
 	void begin(uint16_t baud_count);
 	void end(void);
 
 	virtual int available(void);
+	virtual void accept(void);
 	virtual int peek(void);
 	virtual int read(void);
 	virtual void flush(void);