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4 changes: 2 additions & 2 deletions cores/arduino/WInterrupts.c
Original file line number Diff line number Diff line change
Expand Up @@ -68,7 +68,7 @@ static volatile voidFuncPtr intFunc[EXTERNAL_NUM_INTERRUPTS] = {
// volatile static voidFuncPtr twiIntFunc;

void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode) {
if(interruptNum < EXTERNAL_NUM_INTERRUPTS) {
if((interruptNum < EXTERNAL_NUM_INTERRUPTS) && (interruptNum != NOT_AN_INTERRUPT)) {
intFunc[interruptNum] = userFunc;

// Configure the interrupt mode (trigger on low input, any change, rising
Expand Down Expand Up @@ -185,7 +185,7 @@ void attachInterrupt(uint8_t interruptNum, void (*userFunc)(void), int mode) {
}

void detachInterrupt(uint8_t interruptNum) {
if(interruptNum < EXTERNAL_NUM_INTERRUPTS) {
if((interruptNum < EXTERNAL_NUM_INTERRUPTS) && (interruptNum != NOT_AN_INTERRUPT)) {
// Disable the interrupt. (We can't assume that interruptNum is equal
// to the number of the EIMSK bit to clear, as this isn't true on the
// ATmega8. There, INT0 is 6 and INT1 is 7.)
Expand Down