What is an RTOS in FreeRTOS - Interactive Quiz & Practice

Practice - 5 Tasks

1fill in blank

easy

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

FreeRTOS

void vTaskCode( void * pvParameters ) {
    for( ;; ) {
        printf([1]);
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
}

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

AHello_Rtos

BHello RTOS

C'Hello RTOS'

D"Hello RTOS"

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes instead of double quotes for strings.

Not using quotes at all, which causes a syntax error.

The printf function requires a string literal in double quotes to print text.

2fill in blank

medium

Complete the code to start the FreeRTOS scheduler.

FreeRTOS

int main(void) {
    // Create tasks here
    [1]();
    for( ;; );
}

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

AvTaskStartScheduler

BvStartScheduler

CstartScheduler

DvSchedulerStart

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect function names that do not exist in FreeRTOS.

Forgetting to call the scheduler function.

The FreeRTOS function to start the scheduler is vTaskStartScheduler().

3fill in blank

hard

Fix the error in the task creation code by filling the missing parameter.

FreeRTOS

xTaskCreate(
    vTaskCode,       // Task function
    "Task1",        // Name
    1000,            // Stack size
    NULL,            // Parameters
    1,               // Priority
    [1]      // Task handle
);

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

A0

BNULL

C1

DvTaskHandle

Attempts:

3 left

💡 Hint

Common Mistakes

Passing an integer instead of a pointer.

Passing an uninitialized variable.

The last parameter is a pointer to a task handle. Passing NULL means we don't need to store the handle.

4fill in blank

hard

Fill both blanks to create a dictionary of task names and their priorities.

FreeRTOS

const char* tasks[] = {"TaskA", "TaskB", "TaskC"};
int priorities[] = {1, 2, 3};

for(int i = 0; i < 3; i++) {
    printf("%s priority: %d\n", [1], [2]);
}

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

Atasks[i]

Bpriorities[i]

Ctasks

Dpriorities

Attempts:

3 left

💡 Hint

Common Mistakes

Using array names without index, which prints the pointer address.

Mixing up tasks and priorities arrays.

To print each task name and its priority, use the indexed arrays with tasks[i] and priorities[i].

5fill in blank

hard

Fill all three blanks to create a task that toggles an LED every 500ms.

FreeRTOS

void [1]( void * pvParameters ) {
    for( ;; ) {
        [2]();
        vTaskDelay([3] / portTICK_PERIOD_MS);
    }
}

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

AvToggleLED

BvTaskToggleLED

C500

D1000

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong function names.

Using 1000 instead of 500 for delay.

The task function is named vTaskToggleLED, calls vToggleLED() to toggle the LED, and delays 500 milliseconds.