[Solved] You need to configure configMAX_SYSCALL_INTERRUPT_PRIORITY for a Cortex-M7 with 5 priority bits, ensuring interrupts with priority 10 and below can call FreeRTOS... What is the correct definition? | FreeRTOS

FreeRTOS - Interrupt Management

You need to configure configMAX_SYSCALL_INTERRUPT_PRIORITY for a Cortex-M7 with 5 priority bits, ensuring interrupts with priority 10 and below can call FreeRTOS API safely. What is the correct definition?

A#define configMAX_SYSCALL_INTERRUPT_PRIORITY (5 << (8 - 5))

B#define configMAX_SYSCALL_INTERRUPT_PRIORITY (10 >> (8 - 5))

C#define configMAX_SYSCALL_INTERRUPT_PRIORITY 10

D#define configMAX_SYSCALL_INTERRUPT_PRIORITY (10 << (8 - 5))

Step-by-Step Solution

Solution:

Step 1: Understand priority bits and shifting
Cortex-M7 uses 5 priority bits; priority values must be shifted left by (8 - 5) = 3 bits.
Step 2: Apply shift to priority 10
Shift 10 left by 3 bits: 10 << 3 = 80 decimal (0x50 hex).
Final Answer:
#define configMAX_SYSCALL_INTERRUPT_PRIORITY (10 << (8 - 5)) -> Option D
Quick Check:
Shift priority by (8 - bits) to get correct value [OK]

Quick Trick: Shift priority left by (8 - priority bits) for correct config [OK]

Common Mistakes:

Using right shift instead of left
Not shifting priority value
Using wrong priority number

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What is the correct definition?

Step 1: Understand priority bits and shifting

Step 2: Apply shift to priority 10

Final Answer:

Quick Check:

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