Seeed Studio / USBDevice

usb device library

Fork of USBDevice by mbed official

Diff: USBSerial/USBSerial.cpp

Revision:
6:d0945750af57
Parent:
1:80ab0d068708
--- a/USBSerial/USBSerial.cpp	Sun Oct 14 15:08:52 2012 +0000
+++ b/USBSerial/USBSerial.cpp	Thu Dec 20 17:05:37 2012 +0000
@@ -20,6 +20,8 @@
 #include "USBSerial.h"
 
 int USBSerial::_putc(int c) {
+    if (!terminal_connected)
+        return 0;
     send((uint8_t *)&c, 1);
     return 1;
 }