Is it possible to interrupt another interrupt?

Thanks for your reply.

I believe my system should be configured correctly then, I just wasn't sure if I had things set up correctly.

Basically, to explain my system, I have an EXTI interrupt that I have set the priority to 5 and my ethernet interrupt priority to 6 (lower than the EXTI interrupt). The EXTI interrupt is connected to an external IC that handles communication over another bus to keep it simple. But what I am seeing is when I have constant ethernet activity the EXTI bus misses the odd packet. But with the ethernet activity stopped, then the EXTI bus does not miss any packets. I feel like this shouldn't be the case since the EXTI interrupt is a higher priority so it should take precedence over the ethernet interrupt. Do you have any suggestions for how I have my system configured so that the EXTI interrupt will always override the ethernet interrupt, and so that even if the ethernet interrupt is already in progress the EXTI will take precedence?

Thanks,

Doug Burrell

Yes, it says that only the group priority determines the preemption of interrupt exceptions. So I have EXTI interrupt preempt priority set to 5, subpriority to 0, and for Ethernet I have preempt priority set to 6 and subpriority to 0. I've also got the grouping set to 4 bits for pre-emption priority. Does this all sound correct so that EXTI interrupts can preempt the Ethernet interrupts?

Thanks, I think things are working correctly but I'm just not sure how when I get a lot of ethernet activity, my EXTI interrupt source starts to lose packets. I have to take a really close look at these register contents. Thanks!