You want to implement a periodic task with precise timing using vTaskDelay(). Which problem will you face compared to using vTaskDelayUntil()?

hard📝 Application Q9 of 15

FreeRTOS - Task Scheduling

You want to implement a periodic task with precise timing using vTaskDelay(). Which problem will you face compared to using vTaskDelayUntil()?

AvTaskDelayUntil does not allow task blocking.

BvTaskDelay causes cumulative timing drift over iterations.

CvTaskDelay cannot delay for more than 10 ticks.

DvTaskDelayUntil causes the task to run too fast.

Step-by-Step Solution

Solution:

Step 1: Compare vTaskDelay and vTaskDelayUntil
vTaskDelay delays relative to current time, causing drift if task execution time varies.
Step 2: Understand timing drift
Over many iterations, small delays add up, shifting the task schedule.
Final Answer:
vTaskDelay causes cumulative timing drift over iterations. -> Option B
Quick Check:
vTaskDelay drift vs vTaskDelayUntil fixed timing [OK]

Quick Trick: vTaskDelay drifts; vTaskDelayUntil keeps fixed period [OK]

Common Mistakes:

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