GPIO gives Multiple Interrupt events for single interrupt generation
Re: GPIO gives Multiple Interrupt events for single interrupt generation
You could do a quick check directly in the ISR if the last event has been too recent, and ignore the new interrrupt in this case.
Re: GPIO gives Multiple Interrupt events for single interrupt generation
Yes. But that is work around solution that I have already thought to do it as I have did it into other controller as well before.Hans Dorn wrote:You could do a quick check directly in the ISR if the last event has been too recent, and ignore the new interrrupt in this case.
But, I just want to find out why it is happening and what is exact root cause for that?
Regards,
Ritesh Prajapati
Ritesh Prajapati
Re: GPIO gives Multiple Interrupt events for single interrupt generation
Hi,
I am seeing a similar behavior. I use an opto interrupter that has a nice positive pulse output signal when the light beam is interrupted by a pin sticking to a rotating wheel. I have checked the signal with my scope and the pulse has a clean 10 uSec rising edge, no bounce effect or anything like that. Still I see so now and then double interrupts being fired. So far I have not been able to work out the reason for this behavior. To get rid of the double interrupts, I start a software timer to black put any interrupts arriving in the 40 msec after the pulse has been started, unfortunately this does not help as a 'ghost' interrupts arrive with a random delay, sometimes up to 200msec later.
Anyone any ideas?
Regards,
Ad
I am seeing a similar behavior. I use an opto interrupter that has a nice positive pulse output signal when the light beam is interrupted by a pin sticking to a rotating wheel. I have checked the signal with my scope and the pulse has a clean 10 uSec rising edge, no bounce effect or anything like that. Still I see so now and then double interrupts being fired. So far I have not been able to work out the reason for this behavior. To get rid of the double interrupts, I start a software timer to black put any interrupts arriving in the 40 msec after the pulse has been started, unfortunately this does not help as a 'ghost' interrupts arrive with a random delay, sometimes up to 200msec later.
Anyone any ideas?
Regards,
Ad
Re: GPIO gives Multiple Interrupt events for single interrupt generation
Hi,at-ams wrote:Hi,
I am seeing a similar behavior. I use an opto interrupter that has a nice positive pulse output signal when the light beam is interrupted by a pin sticking to a rotating wheel. I have checked the signal with my scope and the pulse has a clean 10 uSec rising edge, no bounce effect or anything like that. Still I see so now and then double interrupts being fired. So far I have not been able to work out the reason for this behavior. To get rid of the double interrupts, I start a software timer to black put any interrupts arriving in the 40 msec after the pulse has been started, unfortunately this does not help as a 'ghost' interrupts arrive with a random delay, sometimes up to 200msec later.
Anyone any ideas?
Regards,
Ad
Right Now, Temperature Solution for that is to check interrupt status with its value in interrupt ISR call so that you will get only onetime interrupt 90% based on Positive or Negative Edge Trigger Interrupt.
Let me know if need any help in code point of view
Regards,
Ritesh Prajapati
Ritesh Prajapati
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Re: GPIO gives Multiple Interrupt events for single interrupt generation
Same problem here. I feed GPIO0 with a Squarewave signal from RTC DS3231, generating iinterrupt on falling edge. Has hardware pullup 10k to VDD. I see 2-3 interrupts on each falling edge. Checked signal with oscillopscope, it is 100% clean, but has 50 microseconds slope, maybe this is too slow?
Re: GPIO gives Multiple Interrupt events for single interrupt generation
Would you please check with logic as discussed into thread?cyberman54 wrote: ↑Sat Mar 23, 2019 12:30 pmSame problem here. I feed GPIO0 with a Squarewave signal from RTC DS3231, generating iinterrupt on falling edge. Has hardware pullup 10k to VDD. I see 2-3 interrupts on each falling edge. Checked signal with oscillopscope, it is 100% clean, but has 50 microseconds slope, maybe this is too slow?
Regards,
Ritesh Prajapati
Ritesh Prajapati
-
- Posts: 27
- Joined: Sun Jan 14, 2018 7:47 pm
Re: GPIO gives Multiple Interrupt events for single interrupt generation
We can close this. I checked with digital oscilloscope and found a 100nf capacitor on the GPIO is too much. I removed the capacitor and the problem was solved.
Re: GPIO gives Multiple Interrupt events for single interrupt generation
Great.cyberman54 wrote: ↑Sun Apr 14, 2019 1:56 pmWe can close this. I checked with digital oscilloscope and found a 100nf capacitor on the GPIO is too much. I removed the capacitor and the problem was solved.
Thanks for update.
Regards,
Ritesh Prajapati
Ritesh Prajapati
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