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Handling multiple interrupts (noisy line)

Question asked by Mark Senko on Feb 23, 2018
Latest reply on Feb 23, 2018 by waclawek.jan

I'm new to programming with ST Micro, so I hope this is a simple question.

Here is the generic pattern (correct me if I'm wrong)  in an IRQ handler:


void EXTI4_IRQHandler(void)
    if(EXTI_GetITStatus(EXTI_Line4) != RESET)

         /* Execute your code here */

        /* Clear the EXTI line 4 pending bit */


What happens if my external line interrupts at a high rate, maybe it's noisy?

Do I have to worry that I may enter this handler with another interrupt before I've finished servicing the first one? I'd probably need to use a mutex or equivalent if I don't want to service two interrupts at once.

OR.... am I guaranteed not to get another interrupt until after I clear the pending bit?