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Code Issues Releases Activity

bugfix - Serial.write() would try to send even if no CDC connection was open.

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This commit is contained in:
Zach Eveland 2011-08-24 21:04:30 -04:00
parent ff5fe87864
commit eebe997dce
1 changed files with 11 additions and 1 deletions
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12
hardware/arduino/cores/arduino/CDC.cpp
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@ -155,7 +155,17 @@ void Serial_::flush(void)
void Serial_::write(uint8_t c) void Serial_::write(uint8_t c)
{ {
USB_Send(CDC_TX,&c,1); /* 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
is opened and clear lineState when the port is closed.
bytes sent before the user opens the connection or after
the connection is closed are lost - just like with a UART. */
// TODO - ZE - check behavior on different OSes and test what happens if an
// 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);
} }
Serial_ Serial; Serial_ Serial;