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Scoped SPI transactions #2

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bd99b01
Merge pull request #1 from PaulStoffregen/master
crteensy Oct 11, 2014
9d4ba48
Update SPI.h
crteensy Oct 11, 2014
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30 changes: 30 additions & 0 deletions SPI.h
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,36 @@
// usingInterrupt(), and SPISetting(clock, bitOrder, dataMode)
#define SPI_HAS_TRANSACTION 1

// automatically matches pairs of beginTransaction() and endTransaction()
// http://forum.pjrc.com/threads/26808-Scoped-SPI-transactions
#define SPI_TRANSACTION_BLOCK(settings) \
for( \
struct \
{ \
struct Helper \
{ \
Helper() : done_(false) \
{ \
SPI.beginTransaction(settings); \
} \
~Helper() \
{ \
SPI.endTransaction(); \
} \
bool done_; \
}; \
\
bool done() const \
{ \
return helper_.done_; \
} \
void exec() \
{ \
helper_.done_ = true; \
} \
Helper helper_; \
} scope; !scope.done() ; scope.exec())

// Uncomment this line to add detection of mismatched begin/end transactions.
// A mismatch occurs if other libraries fail to use SPI.endTransaction() for
// each SPI.beginTransaction(). Connect a LED to this pin. The LED will turn
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