diff options
Diffstat (limited to 'cores/arduino/CDC.cpp')
| -rw-r--r-- | cores/arduino/CDC.cpp | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/cores/arduino/CDC.cpp b/cores/arduino/CDC.cpp index b229cb5..0d04b9c 100644 --- a/cores/arduino/CDC.cpp +++ b/cores/arduino/CDC.cpp @@ -166,9 +166,15 @@ size_t Serial_::write(uint8_t c) // open connection isn't broken cleanly (cable is yanked out, host dies // or locks up, or host virtual serial port hangs) if (_usbLineInfo.lineState > 0) { - USB_Send(CDC_TX,&c,1); - return 1; + int r = USB_Send(CDC_TX,&c,1); + if (r > 0) { + return r; + } else { + setWriteError(); + return 0; + } } + setWriteError(); return 0; } |