Why design patterns ensure reliable multi-tasking 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);

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AvTaskStartScheduler

BvTaskFunction

CvTaskDelete

DvTaskDelay

Attempts:

3 left

💡 Hint

Common Mistakes

Using scheduler or delay functions instead of the task function.

The function passed to xTaskCreate must be the task function that runs the task code.

2fill in blank

medium

Complete the code to delay a task for 100 ticks.

FreeRTOS

vTaskDelay([1]);

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A1000

B10

C100

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using milliseconds instead of ticks.

Using too large or too small values.

vTaskDelay delays the task for the number of ticks specified. Here, 100 ticks is the intended delay.

3fill in blank

hard

Fix the error in the task creation code to ensure the task runs properly.

FreeRTOS

xTaskCreate(vTaskFunction, "Task2", [1], NULL, 1, NULL);

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A100

BNULL

C0

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero or NULL for stack size.

Using negative numbers.

The stack size must be a positive number. Zero or NULL will cause the task not to run properly.

4fill in blank

hard

Fill both blanks to create a reliable queue and send data to it.

FreeRTOS

QueueHandle_t queue = xQueueCreate([1], sizeof(int));
xQueueSend(queue, &[2], portMAX_DELAY);

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A10

Bdata

C5

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong queue size.

Sending undefined variables.

The queue size is 10, and the variable data is sent to the queue.

5fill in blank

hard

Fill all three blanks to receive data from a queue and process it safely.

FreeRTOS

int [1];
if(xQueueReceive(queue, &[2], [3]) == pdPASS) {
    process([1]);
}

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AreceivedData

CportMAX_DELAY

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names.

Using zero timeout causing immediate return.

The variable receivedData stores the received value. The function waits indefinitely with portMAX_DELAY until data arrives.