Interrupt priority register addressing

[RMyer.1]

Hi All,

I think understand the concept of this, what I am not 100% sure about is how each NVIC_IPRx entry relates to an actual interrupt.

Is it directly referenced to the 'Priority' number in the Interrupt Vector Table ?

So for example just looking at the device I am using, the 'TIM3 Global Interrupt' is priority 36.

If I wanted to change that specific Interrupt in the Interrupt priority register does it work like this?

NVIC Base address = 0xE000E100

NVIC_IPRx Address offset: 0x400 + 0x04

So therefore the Priority entries start at 0xE000E504

0xE000E504 = Priority entry 0 - MemManage

0xE000E505 = Priority entry 1 - BusFault

0xE000E506 = Priority entry 2 - UsageFault

0xE000E507 = Priority entry 3 - SVCall

0xE000E508 = Priority entry 4 - Not Used

0xE000E509 = Priority entry 5 - PendSV

...

...

0xE000E527 = Priority entry 35 - TIM2 Global Interrupt

0xE000E528 = Priority entry 36 - TIM3 Global Interrupt

..

..

0xE000E55C = Priority entry 88 - FPU (final definition in this device)

Is that how it works?

Thanks.

[TDK]

Always include your chip number in your post.

NVIC_SetPriority should be used to change priorities, but yes in general. Details about NVIC can be found in ARM documentation.