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Moving write errors out of return value into separate API methods.

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write(), print(), println() now return size_t (and don't use negative values to signal errors).
Print adds writeError() for checking for write errors, clearWriteError() to reset the flag to false, and a protected setWriteError() for signalling errors.

http://code.google.com/p/arduino/issues/detail?id=598
This commit is contained in:
David A. Mellis
2011-08-26 16:08:14 -04:00
parent 929597375b
commit b73cf39d94
23 changed files with 184 additions and 173 deletions
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8
libraries/SoftwareSerial/SoftwareSerial.cpp
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@ -440,10 +440,12 @@ int SoftwareSerial::available()
return (_receive_buffer_tail + _SS_MAX_RX_BUFF - _receive_buffer_head) % _SS_MAX_RX_BUFF;
}
ssize_t SoftwareSerial::write(uint8_t b)
size_t SoftwareSerial::write(uint8_t b)
{
if (_tx_delay == 0)
return -1;
if (_tx_delay == 0) {
setWriteError();
return 0;
}
uint8_t oldSREG = SREG;
cli(); // turn off interrupts for a clean txmit