Handling multiple interrupts on single EXTI line

manoj23 · ‎2013-01-16

Posted on January 17, 2013 at 05:20

Hi all,

I want to use a multiple interrupts on the single EXTI line. In my case I want to handle interrupts of PF8 and PG8 pins on EXTI_Line8 so how can i do that? Do you have any sample code for that? When I initially define EXTI_Line8 for both pins PF8 and PG8 then my device get stuck in EXTI_GetITStatus function, I think controller is unable to identify EXTI_Line8 for both pins. So how can I handle that?

Thanks & Regards

Jonam

Tesla DeLorean · ‎2013-01-16

Posted on January 17, 2013 at 05:53

You'll need to gate it externally, or use a priority decoder. Or use different pins.

Someone asked a similar question the other week.

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manoj23 · ‎2013-01-16

Posted on January 17, 2013 at 06:20

Hi clive1,

Thanks for your reply. How can i get it externally? I cant use different pin.

manoj23 · ‎2013-01-16

Posted on January 17, 2013 at 06:33

Cant we handle it from software side?

Tesla DeLorean · ‎2013-01-17

Posted on January 17, 2013 at 13:52

Cant we handle it from software side?

You could poll them in a SysTick interrupt.

In hardware you could OR high going signals externally into a single pin, a then have the other pin look at one of the sources.

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manoj23 · ‎2013-01-19

Posted on January 19, 2013 at 12:54

Hi clive1,

Thanks buddy. I have done the same polling method and it works, not properly but yes it is working. Not properly means you know task which i can perform properly using EXTI line can not be perform properly by polling method, but still it is working so no problem.

Thanks & Regards

JoNaM