R52 , priority level = 31 : what is the expected behavior?

Good morning,

I found strange behavior when I set an IRQ priority to 31. The interrupt seems to not preempt anything, as if it were masked. Is it normal? The IRQ with priority levels < 31 behaves as expected.

Can someone explain what is it happening in this case? What is the priority level of SWI trigged with an SVC for example?

Thanks by advance,


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