Task pooling for dynamic workloads in FreeRTOS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a task pool with FreeRTOS.

FreeRTOS

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

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AvTaskFunction

BvTaskDelete

CxQueueCreate

DxSemaphoreCreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using xQueueCreate instead of a task function.

Passing NULL as the task function.

Confusing task creation with semaphore or queue creation.

The function vTaskFunction is the task function passed to xTaskCreate to create a task.

2fill in blank

medium

Complete the code to initialize a queue for task communication.

FreeRTOS

QueueHandle_t xQueue = [1](10, sizeof(int));

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AxTaskCreate

BxSemaphoreCreateBinary

CxQueueCreate

DvTaskDelay

Attempts:

3 left

💡 Hint

Common Mistakes

Using xTaskCreate instead of xQueueCreate.

Using semaphore creation functions instead of queue creation.

Confusing queue creation with task delay.

xQueueCreate creates a queue with a specified length and item size for task communication.

3fill in blank

hard

Fix the error in the task pool code by completing the missing function call.

FreeRTOS

if (xTaskCreate(vTaskFunction, "Task", 1000, NULL, 1, &[1]) != pdPASS) {
    // Handle error
}

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AxQueue

BxTimer

CxSemaphore

DxTaskHandle

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a queue or semaphore handle instead of a task handle.

Passing NULL when a handle pointer is needed.

Confusing timer handles with task handles.

The last argument to xTaskCreate is a pointer to a TaskHandle_t variable, here named xTaskHandle.

4fill in blank

hard

Fill both blanks to create a task pool that dynamically handles workload.

FreeRTOS

for (int i = 0; i < [1]; i++) {
    xTaskCreate(vTaskFunction, "Task", 1000, NULL, [2], NULL);
}

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A5

B1

C10

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero tasks or zero priority which disables tasks.

Using too few tasks to handle workload.

Using priority zero which is invalid.

Creating 10 tasks with priority 1 allows a dynamic task pool to handle workload efficiently.

5fill in blank

hard

Fill all three blanks to implement a task pool that processes data from a queue.

FreeRTOS

void vTaskFunction(void *pvParameters) {
    int data;
    while (1) {
        if (xQueueReceive([1], &data, [2]) == pdPASS) {
            processData(data);
        }
        vTaskDelay([3]);
    }
}

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AxQueue

BportMAX_DELAY

C100 / portTICK_PERIOD_MS

DNULL

Attempts:

3 left

💡 Hint

Common Mistakes

Using NULL instead of the queue handle.

Using zero timeout instead of portMAX_DELAY.

Using zero delay which causes tight looping.

The task receives data from xQueue, waits indefinitely (portMAX_DELAY), and delays 100 ms between checks.