[Solved] Given the code snippet below, what will be the approximate delay between each "Task running" print? TickType_t xLastWakeTime; xLastWakeTime = xTaskGetTickCount();... | FreeRTOS

FreeRTOS - Task Scheduling

Given the code snippet below, what will be the approximate delay between each "Task running" print?

TickType_t xLastWakeTime;
xLastWakeTime = xTaskGetTickCount();

for (;;) {
    vTaskDelayUntil(&xLastWakeTime, pdMS_TO_TICKS(1000));
    printf("Task running\n");
}

AApproximately 1000 milliseconds, steady without drift

BExactly 1000 milliseconds between prints

CVariable delay, sometimes less than 1000 milliseconds

DNo delay, prints continuously

Step-by-Step Solution

Solution:

Step 1: Understand vTaskDelayUntil behavior
It delays the task until the next fixed interval based on the last wake time, keeping timing steady.
Step 2: Analyze the delay duration
The delay is set to 1000 ms converted to ticks, so the task runs approximately every 1000 ms without accumulating drift.
Final Answer:
Approximately 1000 milliseconds, steady without drift -> Option A
Quick Check:
vTaskDelayUntil = steady periodic delay [OK]

Quick Trick: vTaskDelayUntil keeps intervals steady, not exact but no drift [OK]

Common Mistakes:

Assuming exact millisecond precision
Confusing with vTaskDelay which causes drift
Thinking delay varies randomly

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More FreeRTOS Quizzes

Given the code snippet below, what will be the approximate delay between each "Task running" print?

Step 1: Understand vTaskDelayUntil behavior

Step 2: Analyze the delay duration

Final Answer:

Quick Check:

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