[Solved] Consider the following code snippet for ARM Cortex-M NVIC: NVIC_SetPriority(TIM2_IRQn, 2); NVIC_EnableIRQ(TIM2_IRQn); NVIC_SetPriority(USART1_IRQn, 1);... Which interrupt has higher priority? | ARM Architecture

ARM Architecture - Exception and Interrupt Model

Consider the following code snippet for ARM Cortex-M NVIC:

NVIC_SetPriority(TIM2_IRQn, 2);
NVIC_EnableIRQ(TIM2_IRQn);
NVIC_SetPriority(USART1_IRQn, 1);
NVIC_EnableIRQ(USART1_IRQn);

Which interrupt has higher priority?

AUSART1_IRQn has higher priority

BTIM2_IRQn has higher priority

CBoth have equal priority

DPriority cannot be determined

Step-by-Step Solution

Solution:

Step 1: Understand priority values
Lower numeric priority value means higher priority in NVIC.
Step 2: Compare priorities set
TIM2_IRQn is set to 2, USART1_IRQn is set to 1, so USART1_IRQn has higher priority.
Final Answer:
USART1_IRQn has higher priority -> Option A
Quick Check:
Lower number = higher priority = USART1_IRQn [OK]

Quick Trick: Lower priority number means higher priority [OK]

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