what nvic_priority should i set?

Question

hi,all! 
 i am confused about whicn priority should i set for my interrupt. 
 For deteils, I need a gpioe interrupt for my button, and this button is used to POWER OFF my device(using system_of_mode_enter();), so which priority should i choose? 
 By the way, why i would get this confusion is because i read the character "Exception (interrupt) management with a SoftDevicenrf" in the "51_reference_manual" page 170. According to what it said, the priority 0 is prepared for the LowerStack so i not sure if my priority also set to 0 will cause some problem or not. 
 Looking forward for your reply, thank you very much!

Håkon Alseth · Accepted Answer

Hi, 
 The softdevice uses interrupt priority level 0 and 2.
Levels 1 and 3 are then available for your application. 
 If you try to set your interrupt priority to the same as the softdevice, you will get an assert. 
 Best regards
Håkon

what nvic_priority should i set?

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