CCS/EK-TM4C129EXL: Minimal time between Interrupts, interrupt service routines

Hello Arne,

It sounds like this would be with just one, or a handful of GPIO, is that correct?

If so, if the speed of the encoder is too fast for the interrupt to finish processing for a given GPIO, then you wouldn't be able to stack interrupts because the interrupt would still be being serviced.

What kind of processing to do you need to do? Do you need to count the number of edges? How fast are they coming in? Do you need to also understand the timing between edges?

Dear Ralph,

Already thanks for replying.

Some explanation:
I'm reading out 2 encoders, so I read out atleast 2 GPIO's, but i'd rather read out 4 (2phases per encoder so I can check the direction).
My test setup at max speed is sending pulses every 50microseconds (for 1phase), if I read out 2phases (which are 90degrees apart) I will have a pulse every 25µs.

So every 50µs interrupt A will trigger, but 25µs after interrupt A is triggered, interrupt B will trigger. (A and B are on different pins)

If I place another encoder and read out 2 more phases, in the best case I can manage to get the interrupt exactly to trigger between A and B.
So 2 encoders 2phases per encoder the minimal time between different interrupts is at best 12.5µs.

But I really like to know what the minimal time is for the same interrupt to be detectable.

Questions:
So if I understand interrupts that are on different GPIO's will have no influence on one another, it just gets stacked?
If interrupt A isn't cleared, it won't detect another interrupt of A and so doesn't stack?
So only Interrupts on different GPIO stack?
What's the minimal time an interrupt takes to do if I literally only do "pulses1+=1;"?

Can an interrupt length be measured as this or will it take longer or shorter since "TimerValueget" will also take some time?

void Trigger1(void){
Timervalue1=TimerValueGet(TIMER0_BASE,TIMER_A);
GPIOIntClear(GPIO_PORTE_BASE, GPIO_INT_PIN_2);
pulses1+=1;
Timervalue2=TimerValueGet(TIMER0_BASE,TIMER_A);
}

int main(void)
{
//triggercode
while(1){
  ElapsedTime=Timervalue2-Timervalue1;
  }
}

Arne