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[avr] Made SPI.usingInterrupt() synchronized (Andrew Kroll)

This commit is contained in:
Cristian Maglie 2014-11-18 20:02:27 +01:00
parent b0eac9bd05
commit 4db19b12c0
1 changed files with 7 additions and 9 deletions
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16
libraries/SPI/SPI.cpp
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@ -111,11 +111,9 @@ void SPIClass::end() {
void SPIClass::usingInterrupt(uint8_t interruptNumber)
{
uint8_t mask;
if (interruptMode > 1) return;
noInterrupts();
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;
@ -143,12 +141,12 @@ void SPIClass::usingInterrupt(uint8_t interruptNumber)
#endif
default:
interruptMode = 2;
interrupts();
return;
break;
}
interruptMode = 1;
interruptMask |= mask;
interrupts();
if (!interruptMode)
interruptMode = 1;
SREG = sreg;
}
void SPIClass::notUsingInterrupt(uint8_t interruptNumber)