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Which of the following best describes configMAX_SYSCALL_INTERRUPT_PRIORITY in FreeRTOS?

easy📝 Conceptual Q2 of 15
FreeRTOS - Interrupt Management

Which of the following best describes configMAX_SYSCALL_INTERRUPT_PRIORITY in FreeRTOS?

AThe highest interrupt priority from which FreeRTOS API functions can be called
BThe lowest interrupt priority allowed in the system
CThe priority level that disables all interrupts
DThe priority used for the idle task
Step-by-Step Solution
Solution:

  1. Step 1: Define configMAX_SYSCALL_INTERRUPT_PRIORITY

    This value sets the highest interrupt priority that can safely call FreeRTOS API functions.

  2. Step 2: Differentiate from other priorities

    It is not the lowest priority or related to disabling interrupts or idle task priority.

  3. Final Answer:

    The highest interrupt priority from which FreeRTOS API functions can be called -> Option A

  4. Quick Check:

    configMAX_SYSCALL_INTERRUPT_PRIORITY = Max API call interrupt priority [OK]
Quick Trick: It limits API calls to interrupts at or below this priority [OK]
Common Mistakes:
  • Confusing it with lowest priority or idle task priority
  • Thinking it disables interrupts
  • Assuming it applies to all interrupts

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