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Code Issues Releases Activity

[avr] Added SPI.notUsingInterrupt() (Andrew Kroll)

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This commit is contained in:
Cristian Maglie 2014-10-21 13:12:25 +02:00
parent 8344812ce8
commit d9537cb7da
2 changed files with 52 additions and 0 deletions
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42
hardware/arduino/avr/libraries/SPI/SPI.cpp
View File

@ -151,3 +151,45 @@ void SPIClass::usingInterrupt(uint8_t interruptNumber)
interrupts();
}
void SPIClass::notUsingInterrupt(uint8_t interruptNumber)
{
// Once in mode 2 we can't go back to 0 without a proper reference count
if (interruptMode == 2)
return;
uint8_t mask = 0;
uint8_t sreg = SREG;
noInterrupts(); // Protect from a scheduler and prevent transactionBegin
switch (interruptNumber) {
#ifdef SPI_INT0_MASK
case 0: mask = SPI_INT0_MASK; break;
#endif
#ifdef SPI_INT1_MASK
case 1: mask = SPI_INT1_MASK; break;
#endif
#ifdef SPI_INT2_MASK
case 2: mask = SPI_INT2_MASK; break;
#endif
#ifdef SPI_INT3_MASK
case 3: mask = SPI_INT3_MASK; break;
#endif
#ifdef SPI_INT4_MASK
case 4: mask = SPI_INT4_MASK; break;
#endif
#ifdef SPI_INT5_MASK
case 5: mask = SPI_INT5_MASK; break;
#endif
#ifdef SPI_INT6_MASK
case 6: mask = SPI_INT6_MASK; break;
#endif
#ifdef SPI_INT7_MASK
case 7: mask = SPI_INT7_MASK; break;
#endif
default:
break;
// this case can't be reached
}
interruptMask &= ~mask;
if (!interruptMask)
interruptMode = 0;
SREG = sreg;
}

10
hardware/arduino/avr/libraries/SPI/SPI.h
View File

@ -20,6 +20,9 @@
// usingInterrupt(), and SPISetting(clock, bitOrder, dataMode)
#define SPI_HAS_TRANSACTION 1
// SPI_HAS_NOTUSINGINTERRUPT means that SPI has notUsingInterrupt() method
#define SPI_HAS_NOTUSINGINTERRUPT 1
// 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 an LED to this pin. The LED will turn
@ -154,6 +157,13 @@ public:
// with attachInterrupt. If SPI is used from a different interrupt
// (eg, a timer), interruptNumber should be 255.
static void usingInterrupt(uint8_t interruptNumber);
// And this does the opposite.
static void notUsingInterrupt(uint8_t interruptNumber);
// Note: the usingInterrupt and notUsingInterrupt functions should
// not to be called from ISR context or inside a transaction.
// For details see:
// https://github.com/arduino/Arduino/pull/2381
// https://github.com/arduino/Arduino/pull/2449
// Before using SPI.transfer() or asserting chip select pins,
// this function is used to gain exclusive access to the SPI bus