Memory usage monitoring in FreeRTOS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the current free heap size in FreeRTOS.

FreeRTOS

size_t freeHeap = [1]();

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AvTaskDelay

BxPortGetFreeHeapSize

CxTaskGetTickCount

DxQueueCreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using task-related functions like xTaskGetTickCount instead of heap functions.

Confusing delay functions with memory functions.

The function xPortGetFreeHeapSize() returns the current free heap size in bytes.

2fill in blank

medium

Complete the code to print the minimum ever free heap size in FreeRTOS.

FreeRTOS

printf("Min free heap: %u bytes\n", [1]());

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AvTaskDelay

BxTaskGetTickCount

CxPortGetMinimumEverFreeHeapSize

DxPortGetFreeHeapSize

Attempts:

3 left

💡 Hint

Common Mistakes

Using the current free heap size function instead of minimum ever.

Using unrelated task or delay functions.

xPortGetMinimumEverFreeHeapSize() returns the smallest amount of free heap ever recorded, useful for checking memory usage peaks.

3fill in blank

hard

Fix the error in the code to correctly get the free heap size.

FreeRTOS

size_t freeHeap = [1]();

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AxPortGetFreeHeapSize

BvTaskGetHeapSize

CxTaskGetFreeHeapSize

DxPortGetFreeHeap

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect or non-existent function names.

Confusing task or delay functions with heap functions.

The correct function to get free heap size is xPortGetFreeHeapSize(). Other options are invalid or do not exist.

4fill in blank

hard

Fill both blanks to create a dictionary of task names and their stack high water marks.

FreeRTOS

TaskStatus_t taskStatusArray[[1]];
for (int i = 0; i < [2]; i++) {
    printf("Task: %s, Stack high water mark: %u\n", taskStatusArray[i].pcTaskName, taskStatusArray[i].usStackHighWaterMark);
}

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AuxTaskGetNumberOfTasks

BvTaskDelay

CconfigMAX_PRIORITIES

DxPortGetFreeHeapSize

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated functions for array size or loop count.

Using constants instead of dynamic task count.

uxTaskGetNumberOfTasks() returns the number of tasks, used to size the array and loop count.

5fill in blank

hard

Fill all three blanks to create a filtered dictionary of tasks with stack high water mark below a threshold.

FreeRTOS

for (int i = 0; i < [1]; i++) {
    if (taskStatusArray[i].usStackHighWaterMark [2] [3]) {
        printf("Low stack task: %s, Water mark: %u\n", taskStatusArray[i].pcTaskName, taskStatusArray[i].usStackHighWaterMark);
    }
}

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AuxTaskGetNumberOfTasks

B<

C100

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operators.

Using incorrect loop limits.

Confusing threshold values.

The loop runs over all tasks using uxTaskGetNumberOfTasks(). The condition checks if the stack high water mark is less than 100 bytes to find tasks with low stack.