[Solved] You want to measure CPU idle time using the idle hook. Which approach is correct? — Ans: Increment a counter in the idle hook and calculate percentage over time | FreeRTOS

FreeRTOS - Task Scheduling

You want to measure CPU idle time using the idle hook. Which approach is correct?

AIncrement a counter in the idle hook and calculate percentage over time

BCall vTaskDelay inside idle hook to measure idle time

CUse a high priority task to count idle cycles

DDisable the idle task and measure CPU usage manually

Step-by-Step Solution

Solution:

Step 1: Understand idle time measurement
Counting how often the idle hook runs reflects CPU idle time.
Step 2: Analyze options
Incrementing a counter in idle hook and calculating percentage is correct. Other options misuse delay or task priorities.
Final Answer:
Increment a counter in the idle hook and calculate percentage over time -> Option A
Quick Check:
Counting idle hook calls measures idle time = D [OK]

Quick Trick: Count idle hook calls to estimate CPU idle time [OK]

Common Mistakes:

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