Why does vTaskGetRunTimeStats() require a timer configured with a known frequency, and what happens if the timer frequency is incorrect?

hard📝 Conceptual Q10 of 15

FreeRTOS - Debugging and Monitoring

Why does vTaskGetRunTimeStats() require a timer configured with a known frequency, and what happens if the timer frequency is incorrect?

AThe timer triggers the function; incorrect frequency causes missed calls

BThe timer manages memory allocation; incorrect frequency causes leaks

CThe timer sets task priorities; incorrect frequency causes priority inversion

DThe timer measures CPU time; incorrect frequency causes wrong CPU usage percentages

Step-by-Step Solution

Solution:

Step 1: Understand timer role in CPU usage measurement
The timer counts CPU run time; frequency is used to calculate percentages accurately.
Step 2: Effect of incorrect timer frequency
If frequency is wrong, CPU usage percentages will be incorrect because calculations rely on timer ticks.
Final Answer:
The timer measures CPU time; incorrect frequency causes wrong CPU usage percentages -> Option D
Quick Check:
Timer frequency accuracy = correct CPU usage stats [OK]

Quick Trick: Timer frequency must be accurate for correct CPU usage stats [OK]

Common Mistakes:

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