Why priority design matters in FreeRTOS - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the task priority correctly.

FreeRTOS

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

Drag options to blanks, or click blank then click option'

AconfigMAX_PRIORITIES + 1

B0

CtskIDLE_PRIORITY + 1

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Setting priority to 0 causes the task to have idle priority.

Using negative or out-of-range priorities causes errors.

The task priority must be set above the idle priority to ensure it runs.

2fill in blank

medium

Complete the code to create a high priority task.

FreeRTOS

xTaskCreate(TaskFunction, "HighPriorityTask", 1000, NULL, [1], NULL);

Drag options to blanks, or click blank then click option'

A1

BtskIDLE_PRIORITY

CconfigMAX_PRIORITIES + 1

DconfigMAX_PRIORITIES - 1

Attempts:

3 left

💡 Hint

Common Mistakes

Using configMAX_PRIORITIES causes invalid priority error.

Using idle priority for high priority tasks causes scheduling issues.

High priority tasks use the highest valid priority, which is configMAX_PRIORITIES - 1.

3fill in blank

hard

Fix the error in the priority assignment.

FreeRTOS

vTaskPrioritySet(TaskHandle, [1]);

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AtskIDLE_PRIORITY + 2

BconfigMAX_PRIORITIES

C-1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Setting priority to configMAX_PRIORITIES causes errors.

Negative priorities are invalid.

Priority must be within valid range: 0 to configMAX_PRIORITIES - 1.

4fill in blank

hard

Fill both blanks to create a medium priority task and set its priority.

FreeRTOS

xTaskCreate(TaskFunction, "MediumTask", 1000, NULL, [1], &TaskHandle);
vTaskPrioritySet(TaskHandle, [2]);

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AtskIDLE_PRIORITY + 2

BtskIDLE_PRIORITY + 1

DconfigMAX_PRIORITIES

Attempts:

3 left

💡 Hint

Common Mistakes

Using different priorities for creation and setting causes confusion.

Using invalid priority values causes runtime errors.

Both creation and priority set use the same valid medium priority.

5fill in blank

hard

Fill all three blanks to create a task, set its priority, and delete it properly.

FreeRTOS

xTaskCreate(TaskFunction, "TempTask", 1000, NULL, [1], &TaskHandle);
vTaskPrioritySet(TaskHandle, [2]);
vTaskDelete([3]);

Drag options to blanks, or click blank then click option'

AtskIDLE_PRIORITY + 1

CTaskHandle

DNULL

Attempts:

3 left

💡 Hint

Common Mistakes

Deleting task with NULL handle does nothing.

Using inconsistent priorities causes unexpected behavior.

Create and set priority with valid value, then delete the task using its handle.