FreeRTOS architecture overview - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a FreeRTOS task.

FreeRTOS

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

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

AvTaskFunction

BvTaskDelay

CvTaskStartScheduler

DvTaskDelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using scheduler or delay functions instead of the task function.

Passing NULL instead of a function name.

The function vTaskFunction is the task function passed to xTaskCreate to define the task's behavior.

2fill in blank

medium

Complete the code to start the FreeRTOS scheduler.

FreeRTOS

int main(void) {
    // Setup code
    [1]();
    for(;;); // Should never reach here
}

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

AvTaskDelay

BvTaskDelete

CxTaskCreate

DvTaskStartScheduler

Attempts:

3 left

💡 Hint

Common Mistakes

Calling task creation functions instead of starting the scheduler.

Using delay functions to start the scheduler.

vTaskStartScheduler() starts the FreeRTOS scheduler which begins running tasks.

3fill in blank

hard

Fix the error in the task delay call to correctly delay for 1000 milliseconds.

FreeRTOS

void vTaskFunction(void *pvParameters) {
    for(;;) {
        [1](1000 / portTICK_PERIOD_MS);
    }
}

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

AvTaskDelay(1000)

BvTaskDelayMs

CvTaskDelay

Ddelay

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-FreeRTOS delay functions.

Passing the delay time inside the function call in the blank.

vTaskDelay() delays a task for a number of tick periods. The argument is in ticks, so 1000 milliseconds must be converted to ticks using 1000 / portTICK_PERIOD_MS.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps task names to their priorities if priority is greater than 2.

FreeRTOS

task_priorities = {task[1]: priority for task, priority in tasks.items() if priority [2] 2}

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A.name

B<=

C>

D.id

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect property names like .id instead of .name.

Using wrong comparison operators like <= instead of >.

Access the task's name with .name and filter priorities greater than 2 with >.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase task names to their priorities if priority is greater than 0.

FreeRTOS

task_map = [1]: [2] for task, priority in tasks.items() if priority [3] 0}}

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

Atask.upper()

Bpriority

C>

Dtask.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase instead of uppercase for task names.

Using wrong comparison operators like < instead of >.

Use task.upper() for uppercase keys, priority as values, and filter with > 0.