vTaskGetRunTimeStats() for CPU usage in FreeRTOS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a buffer for runtime stats.

FreeRTOS

char statsBuffer[[1]];

Drag options to blanks, or click blank then click option'

A512

B1024

C256

D128

Attempts:

3 left

💡 Hint

Common Mistakes

Using too small a buffer causing string truncation.

Using an uninitialized buffer.

The buffer size should be large enough to hold the runtime stats string. 1024 bytes is a common safe size.

2fill in blank

medium

Complete the code to call vTaskGetRunTimeStats with the buffer.

FreeRTOS

vTaskGetRunTimeStats([1]);

Drag options to blanks, or click blank then click option'

AstatsBuffer

B&statsBuffer

CNULL

Dbuffer

Attempts:

3 left

💡 Hint

Common Mistakes

Passing &statsBuffer which is a pointer to the whole array, not a char pointer.

Passing NULL which causes no output.

The function expects a pointer to a char array, so passing the array name (statsBuffer) is correct.

3fill in blank

hard

Fix the error in printing the runtime stats string.

FreeRTOS

printf("CPU Usage:\n%s", [1]);

Drag options to blanks, or click blank then click option'

A*statsBuffer

B&statsBuffer

CstatsBuffer

DstatsBuffer[0]

Attempts:

3 left

💡 Hint

Common Mistakes

Using &statsBuffer which is a pointer to the array, not a char pointer.

Using *statsBuffer which is a char, not a pointer.

printf expects a char pointer for %s, so passing statsBuffer (the array name) is correct.

4fill in blank

hard

Fill both blanks to declare and initialize the buffer, then get runtime stats.

FreeRTOS

char [1][512];
vTaskGetRunTimeStats([2]);

Drag options to blanks, or click blank then click option'

AstatsBuffer

Bbuffer

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for declaration and function call.

Passing an uninitialized buffer.

The buffer is declared as statsBuffer and passed to vTaskGetRunTimeStats.

5fill in blank

hard

Fill all three blanks to declare buffer, get stats, and print them.

FreeRTOS

char [1][1024];
vTaskGetRunTimeStats([2]);
printf("Task CPU Usage:\n%s", [3]);

Drag options to blanks, or click blank then click option'

AruntimeStats

DstatsBuffer

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for buffer declaration and usage.

Passing NULL or wrong pointer to vTaskGetRunTimeStats.

The buffer is named statsBuffer, passed to vTaskGetRunTimeStats, and printed.