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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 39582bc7a9
commit 856e5dcfa4
2 changed files with 2 additions and 2 deletions
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2
LiquidCrystal.cpp
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@@ -258,7 +258,7 @@ inline void LiquidCrystal::command(uint8_t value) {
send(value, LOW); send(value, LOW);
} }
inline ssize_t LiquidCrystal::write(uint8_t value) { inline size_t LiquidCrystal::write(uint8_t value) {
send(value, HIGH); send(value, HIGH);
return 1; // assume sucess return 1; // assume sucess
} }

2
LiquidCrystal.h
View File

@@ -79,7 +79,7 @@ public:
void createChar(uint8_t, uint8_t[]); void createChar(uint8_t, uint8_t[]);
void setCursor(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); void command(uint8_t);
private: private:
void send(uint8_t, uint8_t); void send(uint8_t, uint8_t);