2.6 Interrupt Functions

2.6.1 void interrupts();

• brief: re-enable interrupts after having been disabled by function noInterrupts().

• param: void

• return: void.

2.6.2 void noInterrupts();

• brief: disable interrupts.

• param: void

• return: void.

2.6.3 void attachInterrupt(digitalPinToInterrupt(pin), ISR, mode);

• brief: attach interrupt to some particular digital pin. Whenever there is an interrupt, function ISR will be called.

• param:

  • digitalPinToInterrupt(pin): an interrupt is normally triggered from a particular pin.

  • ISR: Interrupt Service Routine, a function has NO parameters and has NO return value.

  • mode: LOW, HIGH, CHANGE, RISING or FALLING.

    1. LOW： trigger the interrupt whenever the pin is at low-level.

    2. HIGH: trigger the interrupt whenever the pin is at high-level.

    3. CHANGE: trigger the interrupt whenever the pin changes from HIGH to LOW, or from LOW to HIGH.

    4. RISING: trigger the interrupt whenever the pin changes from LOW to HIGH.

    5. FALLING: trigger the interrupt whenever the pin changes from HIGH to LOW.

• return: void.

2.6.4 void detachInterrupt(digitalPinToInterrupt(pin));

• brief: detach interrupt from some particular digital pin.

• param:

  • digitalPinToInterrupt(pin): an interrupt is normally triggered from a particular pin.

• return: void.