diff options
Diffstat (limited to 'cores/arduino')
| -rw-r--r-- | cores/arduino/CDC.cpp | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/cores/arduino/CDC.cpp b/cores/arduino/CDC.cpp index 1275304..c1e646d 100644 --- a/cores/arduino/CDC.cpp +++ b/cores/arduino/CDC.cpp @@ -213,10 +213,19 @@ size_t Serial_::write(uint8_t c) return 0; } +// 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 +// setup() before printing to ensure that an application on the host is +// actually ready to receive and display the data. +// We add a short delay before returning to fix a bug observed by Federico +// where the port is configured (lineState != 0) but not quite opened. Serial_::operator bool() { - if (_usbLineInfo.lineState > 0) - return true; - return false; + bool result = false; + if (_usbLineInfo.lineState > 0) + result = true; + delay(10); + return result; } Serial_ Serial; |