Why RTOS over bare-metal in FreeRTOS - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a FreeRTOS task that prints "Hello".

FreeRTOS

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

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

AvTaskStartScheduler

BvTaskDelay

CvTaskPrintHello

DvTaskDelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using scheduler start function instead of task function

Using delay or delete functions incorrectly

The function vTaskPrintHello is the task function that prints "Hello". It is passed to xTaskCreate to create the task.

2fill in blank

medium

Complete the code to start the FreeRTOS scheduler.

FreeRTOS

int main() {
    // Setup code
    [1]();
    while(1) {}
}

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AvTaskSuspend

BvTaskDelete

CvTaskDelay

DvTaskStartScheduler

Attempts:

3 left

💡 Hint

Common Mistakes

Calling delay or delete functions instead of starting scheduler

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

3fill in blank

hard

Fix the error in the task function to yield control to other tasks.

FreeRTOS

void vTaskFunction(void *pvParameters) {
    while(1) {
        // Do work
        [1](1);
    }
}

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

AvTaskSuspend

BvTaskDelay

CvTaskStartScheduler

DvTaskDelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using delete or suspend which stops the task

Starting scheduler inside task

Using vTaskDelay(1) inside the loop allows the task to yield and lets other tasks run.

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.upper()

B>

C<

D.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operator

Not changing case of task names

The task names are converted to uppercase with .upper(), and only tasks with priority greater than 2 are included.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase task names to their priorities if priority is less than 5.

FreeRTOS

filtered_tasks = [1]: [2] for task, [3] in tasks.items() if priority < 5}}

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

Atask.upper()

Bpriority

Dtask

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names

Not converting task names to uppercase

The dictionary maps uppercase task names (task.upper()) to their priorities, filtering tasks with priority less than 5.