Choosing priorities for real applications in FreeRTOS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the highest priority for a critical task.

FreeRTOS

xTaskCreate(taskFunction, "Task1", 1000, NULL, [1], NULL);

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AconfigMAX_PRIORITIES - 1

B0

C1

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 as the highest priority, which is actually the lowest.

Using a priority higher than configMAX_PRIORITIES - 1, which is invalid.

The highest priority in FreeRTOS is configMAX_PRIORITIES - 1 because priorities start at 0.

2fill in blank

medium

Complete the code to create a low priority background task.

FreeRTOS

xTaskCreate(backgroundTask, "BGTask", 500, NULL, [1], NULL);

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A1

B0

CconfigMAX_PRIORITIES

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning a high priority to background tasks, which can block important tasks.

Using a priority value outside the allowed range.

Priority 0 is the lowest priority in FreeRTOS, suitable for background tasks.

3fill in blank

hard

Fix the error in setting task priority to avoid invalid priority assignment.

FreeRTOS

xTaskCreate(myTask, "MyTask", 256, NULL, [1], NULL);

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AconfigMAX_PRIORITIES

B-1

CconfigMAX_PRIORITIES - 1

D100

Attempts:

3 left

💡 Hint

Common Mistakes

Using configMAX_PRIORITIES as a priority, which is out of range.

Using negative priority values.

Task priority must be less than configMAX_PRIORITIES. Using configMAX_PRIORITIES - 1 is valid.

4fill in blank

hard

Fill both blanks to create a medium priority task that runs periodically.

FreeRTOS

xTaskCreate([1], "PeriodicTask", 512, NULL, [2], NULL);

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AperiodicTaskFunction

BconfigMAX_PRIORITIES - 1

C5

DidleTaskFunction

Attempts:

3 left

💡 Hint

Common Mistakes

Using the idle task function for a periodic task.

Assigning the highest priority to a periodic task unnecessarily.

The task function is periodicTaskFunction and priority 5 is a medium priority.

5fill in blank

hard

Fill all three blanks to create a task with a custom stack size, priority, and name.

FreeRTOS

xTaskCreate([1], [2], [3], NULL, 3, NULL);

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AcustomTaskFunction

B"CustomTask"

C1024

D"DefaultTask"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number instead of a string for the task name.

Mixing up the order of arguments.

The task uses customTaskFunction, named "CustomTask", with a stack size of 1024.