vTaskPrioritySet() dynamic priority in FreeRTOS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the priority of a FreeRTOS task.

FreeRTOS

vTaskPrioritySet([1], 3);

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

Apriority

BTaskHandle_t

CxTaskHandle

DtaskHandle

Attempts:

3 left

💡 Hint

Common Mistakes

Using the priority value as the first argument.

Using the type name instead of a variable.

Using an undefined variable.

The function vTaskPrioritySet() requires the task handle as the first argument. Here, taskHandle is the correct variable representing the task.

2fill in blank

medium

Complete the code to increase the priority of a task by 1.

FreeRTOS

vTaskPrioritySet(taskHandle, [1] + 1);

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

AuxTaskPriorityGet(taskHandle)

BtaskPriority

CpriorityLevel

DgetPriority()

Attempts:

3 left

💡 Hint

Common Mistakes

Using an undefined variable for priority.

Trying to call a method that does not exist.

Passing the priority value directly without getting current priority.

The function uxTaskPriorityGet() returns the current priority of the task. Adding 1 increases the priority by one level.

3fill in blank

hard

Fix the error in setting the task priority dynamically.

FreeRTOS

int newPriority = [1];
vTaskPrioritySet(taskHandle, newPriority);

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

ApriorityLevel + 1

BuxTaskPriorityGet(taskHandle) + 1

CgetPriority() + 1

DtaskPriority + 1

Attempts:

3 left

💡 Hint

Common Mistakes

Using variables that are not declared or initialized.

Using functions that do not exist in FreeRTOS.

Not adding 1 to the current priority.

To set a new priority, you must get the current priority using uxTaskPriorityGet() and then add 1. Other options use undefined variables or functions.

4fill in blank

hard

Fill both blanks to create a dictionary of task names and their priorities for tasks with priority greater than 2.

FreeRTOS

taskPriorities = { [1]: uxTaskPriorityGet([2]) for [1] in taskList if uxTaskPriorityGet([1]) > 2 }

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

Atask

BtaskHandle

Cpriority

DtaskName

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variables for key and value access.

Using undefined variables.

Confusing task names with task handles.

The variable task is used as the loop variable representing each task handle in taskList. We use it to get the priority and as the key in the dictionary.

5fill in blank

hard

Fill all three blanks to create a dictionary mapping task names to their priorities for tasks with priority above 1.

FreeRTOS

taskPriorityDict = { [1]: [2] for [3] in tasks if [2] > 1 }

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

Atask.name

Btask.priority

Ctask

DuxTaskPriorityGet(task)

Attempts:

3 left

💡 Hint

Common Mistakes

Using undefined variables for keys or values.

Not calling the function to get priority.

Using the wrong variable in the loop.

We loop over task in tasks. The key is task.name and the value is the priority obtained by uxTaskPriorityGet(task). The condition checks if priority is greater than 1.