What is clear pending interrupt4/5/2023 ![]() ![]() To cause an immediate call to the ISR upon reattachment. The interrupt was not attached, so the user does not expect intervening triggers of the interrupt Once: The first time the interrupt button was pressed. This is wrong, it should be 1 as the ISR should only have been called The ISR is reattached.ĮIFR & 1 will be 0: The flag has been cleared. Now press your attachInterrupt button to cause the interrupt to be reattached.ĮIMSK & 1 will be 1. The count will still be 1, as the ISR was not called due to the interrupt not being attached. Trigger the interrupt signal button again.ĮIMSK & 1 will not change: The interrupt was already not attached.ĮIFR & 1 will now be 1, because the interrupt flag signals regardless of whether an interrupt is attached. (EIFR & 1) will be 0, as the trigger flag is not seen at this point in the code: The interrupt triggers and the flag is cleared. You will see that the interrupt is detached by (EIMSK & 0x1) being 0. Trigger your interrupt signaling button once. The third number shows a count of the calls to isrSignal, within which it is incremented by 1. Hello all, I tried searching for a bit but couldn't find anything pertaining to my question.I'm trying to set up an external interrupt but I don't understand why exactly we clear the pending bit in EXTI->PR and not in the NVICICPRx (interrupt clear pending registers). Note that in normal operation, this interrupt ready flag is unset immediately upon call of the ISR. STM32f4 Discovery EXTI Clear pending bit. The second number shows if the interrupt is in a signaled state, i.e. ![]() The first number shows if the interrupt is currently attached. Attach your interrupt signaling button to DPIN2Īttach you attachInterrupt button to DPIN13 ![]()
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