Embedded Systems Programming Quiz
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Questions and Answers

What is the range of the returned count when a counting semaphore is fully taken?

  • 1 to (uxMaxCount-1)
  • 1 to uxMaxCount
  • 0 to uxMaxCount (correct)
  • 0 to (uxMaxCount-1)

    • What is the purpose of the 'notification' mechanism in FreeRTOS?

  • Alternative to binary semaphores with lower memory usage (correct)
  • Alternative to binary semaphores with higher overhead
  • Provide a private value for each task
  • Allow multiple tasks to block on one notification

    • How does a counting semaphore signal availability?

  • Returned count of 0
  • Returned count less than 0
  • Returned count equal to uxMaxCount
  • Returned count greater than 0 (correct)

    • How does FreeRTOS handle context switch in ISR?

    <p>Context switch only when notification value changes</p> Signup and view all the answers

    What happens if xSemaphoreTake returns pdTRUE?

    <p>Semaphore is taken and needs to be released</p> Signup and view all the answers

    What does the private 32-bit 'notification value' do in FreeRTOS tasks?

    <p>Used for blocking and unblocking tasks</p> Signup and view all the answers

    What is the purpose of the function uxTaskPriorityGet in FreeRTOS?

    <p>Obtains the current priority of a task</p> Signup and view all the answers

    In FreeRTOS, what happens if NULL is passed as the parameter in vTaskPrioritySet?

    <p>Changes the priority of the calling task</p> Signup and view all the answers

    Which function in FreeRTOS is used to change the priority of a task?

    <p>vTaskPrioritySet</p> Signup and view all the answers

    What does xQueueCreate do in FreeRTOS?

    <p>Creates a queue for storing items in FIFO order</p> Signup and view all the answers

    When handling an ISR context switch in FreeRTOS, what is the significance of Critical Sections?

    <p>Guarantees thread safety</p> Signup and view all the answers

    What is the consequence of passing an invalid handle to vTaskPrioritySet in FreeRTOS?

    <p>Results in undefined behavior</p> Signup and view all the answers

    In FreeRTOS, what is a weakness related to an undefined pointer value while setting a task's priority?

    <p>No simple test to avoid this issue</p> Signup and view all the answers

    Which function in FreeRTOS changes the priority of a task to a specified value?

    <p>'vTaskPrioritySet'</p> Signup and view all the answers

    'vTaskPrioritySet' should not be called with NULL as its first parameter unless:

    <p>'uxNewPriority' is set to current priority</p> Signup and view all the answers

    'uxTaskPriorityGet' returns undefined for any argument except when:

    <p>'pxTask' is NULL</p> Signup and view all the answers

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