[Solved] Consider the following FreeRTOS task code snippet:TickType_t xLastWakeTime = xTaskGetTickCount();... }What is the expected interval between each "Heartbeat" print? | FreeRTOS

FreeRTOS - Task Scheduling

Consider the following FreeRTOS task code snippet:

TickType_t xLastWakeTime = xTaskGetTickCount();
for (;;) {
    vTaskDelayUntil(&xLastWakeTime, pdMS_TO_TICKS(250));
    printf("Heartbeat\n");
}

What is the expected interval between each "Heartbeat" print?

AIt depends on the task execution time

BApproximately 500 milliseconds

CApproximately 100 milliseconds

DApproximately 250 milliseconds

Step-by-Step Solution

Solution:

Step 1: Understand vTaskDelayUntil()
This function delays a task until a fixed time relative to the last wake time.
Step 2: Analyze the delay period
The delay is set to pdMS_TO_TICKS(250), which converts 250 ms to ticks.
Step 3: Calculate interval
Since the delay is relative to the last wake time, the task runs every 250 ms regardless of execution time.
Final Answer:
Approximately 250 milliseconds -> Option D
Quick Check:
Delay period matches print interval [OK]

Quick Trick: vTaskDelayUntil keeps fixed intervals, ignoring execution time [OK]

Common Mistakes:

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