How would you configure NVIC to prioritize an interrupt with pre-emption priority 2 and subpriority 1 using CMSIS functions?

hard📝 Application Q9 of 15

ARM Architecture - Exception and Interrupt Model

AUse NVIC_DisableIRQ before setting priority

BSet priority grouping, then call NVIC_SetPriority with combined priority value

CCall NVIC_EnableIRQ with pre-emption and subpriority as arguments

DSet priority only using NVIC_SetPriorityGrouping

Step-by-Step Solution

Solution:

Step 1: Set priority grouping
First, configure priority grouping to split bits between pre-emption and subpriority.
Step 2: Use NVIC_SetPriority with combined priority
Calculate combined priority value and set it using NVIC_SetPriority for the IRQ.
Final Answer:
Set priority grouping, then call NVIC_SetPriority with combined priority value -> Option B
Quick Check:
Priority grouping + NVIC_SetPriority = correct config [OK]

Quick Trick: Set grouping first, then set combined priority value [OK]

Common Mistakes:

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