pvPortMalloc and vPortFree in FreeRTOS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to allocate memory dynamically using FreeRTOS.

FreeRTOS

void *ptr = [1](100);

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

AvPortFree

Bmalloc

CpvPortMalloc

Dfree

Attempts:

3 left

💡 Hint

Common Mistakes

Using standard malloc instead of pvPortMalloc.

Confusing allocation with freeing functions.

pvPortMalloc is the FreeRTOS function to allocate memory dynamically.

2fill in blank

medium

Complete the code to free the allocated memory using FreeRTOS.

FreeRTOS

void *ptr = pvPortMalloc(50);
[1](ptr);

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

AvPortFree

Bmalloc

Cfree

DpvPortMalloc

Attempts:

3 left

💡 Hint

Common Mistakes

Using free instead of vPortFree.

Calling pvPortMalloc instead of freeing memory.

vPortFree is the FreeRTOS function to free memory allocated by pvPortMalloc.

3fill in blank

hard

Fix the error in the code to correctly allocate and free memory in FreeRTOS.

FreeRTOS

char *buffer = [1](256);
// Use buffer
vPortFree(buffer);

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

ApvPortMalloc

Bmalloc

CvPortFree

Dcalloc

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing standard malloc/free with FreeRTOS memory functions.

Not using vPortFree to free pvPortMalloc memory.

Use pvPortMalloc to allocate memory and vPortFree to free it in FreeRTOS. The code incorrectly uses free instead of vPortFree.

4fill in blank

hard

Fill both blanks to create a buffer, check allocation success, and free it properly.

FreeRTOS

char *buf = [1](128);
if (buf == [2]) {
    // handle error
}
vPortFree(buf);

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

ApvPortMalloc

BNULL

Cmalloc

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Checking against 0 instead of NULL.

Using malloc instead of pvPortMalloc.

pvPortMalloc allocates memory, and NULL is used to check if allocation failed.

5fill in blank

hard

Fill all three blanks to allocate memory, check success, and free it correctly in FreeRTOS.

FreeRTOS

void *mem = [1](size);
if (mem == [2]) {
    return -1;
}
[3](mem);

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

Amalloc

BNULL

CvPortFree

DpvPortMalloc

Attempts:

3 left

💡 Hint

Common Mistakes

Using standard malloc/free instead of FreeRTOS functions.

Not checking for NULL after allocation.

pvPortMalloc allocates memory, NULL checks failure, and vPortFree frees the memory in FreeRTOS.