Time-slicing for equal priority tasks in FreeRTOS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create two tasks with equal priority in FreeRTOS.

FreeRTOS

xTaskCreate(task1, "Task1", 1000, NULL, [1], NULL);

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A0

B1

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using different priority numbers for tasks that should share CPU time equally.

Confusing stack size with priority.

Priority 1 is assigned to the task, which is a common base priority for equal priority tasks.

2fill in blank

medium

Complete the code to start the FreeRTOS scheduler after creating tasks.

FreeRTOS

vTaskStart[1]();

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AStartScheduler

BScheduler

CStart

DRunScheduler

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect function names like vTaskStart or vTaskRun.

Forgetting to start the scheduler after creating tasks.

The function vTaskStartScheduler() starts the FreeRTOS scheduler to begin task switching.

3fill in blank

hard

Fix the error in the task function to allow time-slicing by yielding the processor.

FreeRTOS

void task1(void *pvParameters) {
    for(;;) {
        // Task code here
        [1]();
    }
}

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AvTaskDelay

BvTaskSuspend

CvTaskDelete

DtaskYIELD

Attempts:

3 left

💡 Hint

Common Mistakes

Using vTaskDelay without a delay time, which causes errors.

Using vTaskSuspend or vTaskDelete which stop the task instead of yielding.

Calling taskYIELD() inside a task allows the scheduler to switch to another task of equal priority, enabling time-slicing.

4fill in blank

hard

Fill both blanks to create two tasks with equal priority and start the scheduler.

FreeRTOS

xTaskCreate(task1, "Task1", 1000, NULL, [1], NULL);
xTaskCreate(task2, "Task2", 1000, NULL, [2], NULL);
vTaskStartScheduler();

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A2

B1

C3

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning different priorities to the tasks, which disables time-slicing.

Using zero priority which may cause unexpected behavior.

Both tasks must have the same priority number (1) to enable time-slicing between them.

5fill in blank

hard

Fill all three blanks to create a task that yields, create two equal priority tasks, and start the scheduler.

FreeRTOS

void task1(void *pvParameters) {
    for(;;) {
        // Task code
        [1]();
    }
}
xTaskCreate(task1, "Task1", 1000, NULL, [2], NULL);
xTaskCreate(task2, "Task2", 1000, NULL, [3], NULL);
vTaskStartScheduler();

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AvTaskDelay

BtaskYIELD

C1

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using vTaskDelay without parameters inside the task.

Assigning different priorities to tasks.

Forgetting to start the scheduler.

The task calls taskYIELD() to allow time-slicing. Both tasks have priority 1 to share CPU time equally. The scheduler is started to begin multitasking.