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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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2
libraries/LiquidCrystal/LiquidCrystal.cpp
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@ -258,7 +258,7 @@ inline void LiquidCrystal::command(uint8_t value) {
send(value, LOW);
}
inline ssize_t LiquidCrystal::write(uint8_t value) {
inline size_t LiquidCrystal::write(uint8_t value) {
send(value, HIGH);
return 1; // assume sucess
}

2
libraries/LiquidCrystal/LiquidCrystal.h
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@ -79,7 +79,7 @@ public:
void createChar(uint8_t, uint8_t[]);
void setCursor(uint8_t, uint8_t);
virtual ssize_t write(uint8_t);
virtual size_t write(uint8_t);
void command(uint8_t);
private:
void send(uint8_t, uint8_t);