Real-time vs general-purpose OS in FreeRTOS - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

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

FreeRTOS

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

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AvTaskFunction

BvTaskStartScheduler

CvTaskDelete

DvTaskDelay

Attempts:

3 left

💡 Hint

Common Mistakes

Using scheduler start function instead of task function.

Using delay or delete functions as task function.

The function passed to xTaskCreate must be the task function, here named vTaskFunction.

2fill in blank

medium

Complete the code to start the FreeRTOS scheduler.

FreeRTOS

int main(void) {
    // Setup code
    [1]();
    for(;;); // Loop forever
}

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AvTaskStartScheduler

BxTaskCreate

CvTaskDelay

DvTaskDelete

Attempts:

3 left

💡 Hint

Common Mistakes

Calling task creation instead of starting scheduler.

Using delay or delete functions here.

The scheduler is started by calling vTaskStartScheduler().

3fill in blank

hard

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

FreeRTOS

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

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AvTaskDelay(1000 / portTICK_PERIOD_MS)

BvTaskDelay(1000)

CvTaskDelay(pdMS_TO_TICKS(1000))

DvTaskDelay(1000 * portTICK_PERIOD_MS)

Attempts:

3 left

💡 Hint

Common Mistakes

Passing milliseconds directly without conversion.

Multiplying or dividing by portTICK_PERIOD_MS incorrectly.

FreeRTOS delays use ticks, so pdMS_TO_TICKS(1000) converts 1000 milliseconds to ticks correctly.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps task names to their priorities for tasks with priority greater than 1.

FreeRTOS

task_priorities = {task.name: task[1] for task in tasks if task.priority [2] 1}

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A.priority

B>

C<

D.name

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operator.

Accessing wrong attribute for priority.

Access the task priority with .priority and filter tasks with priority greater than 1 using >.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase task names to their stack sizes for tasks with stack size greater than 512.

FreeRTOS

task_info = { [1]: [2] for task in tasks if task.stack_size [3] 512}

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Atask.name.upper()

Btask.stack_size

C>

Dtask.priority

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong attribute for stack size.

Using wrong comparison operator.

Use task.name.upper() for uppercase names, task.stack_size for stack size, and filter with > 512.