[Solved] Given the code snippet:UBaseType_t freeStack = uxTaskGetStackHighWaterMark(NULL);printf("Free stack: %u\n", freeStack);What does this code output? | FreeRTOS

FreeRTOS - Memory Management

Given the code snippet:

UBaseType_t freeStack = uxTaskGetStackHighWaterMark(NULL);
printf("Free stack: %u\n", freeStack);

What does this code output?

AThe total stack size of the current task

BThe current CPU usage percentage

CThe minimum free stack space left in the current task

DThe number of tasks running

Step-by-Step Solution

Solution:

Step 1: Analyze uxTaskGetStackHighWaterMark(NULL)
Passing NULL gets the current task's minimum free stack space since start.
Step 2: Understand printf output
It prints the free stack space value, not total stack or CPU info.
Final Answer:
The minimum free stack space left in the current task -> Option C
Quick Check:
NULL param = current task stack free space [OK]

Quick Trick: NULL means current task in FreeRTOS stack check [OK]

Common Mistakes:

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