You need to allocate memory for an array of 10 integers in FreeRTOS using pvPortMalloc. Which of the following code snippets correctly performs this allocation and deallocation?

hard📝 Application Q8 of 15

FreeRTOS - Memory Management

You need to allocate memory for an array of 10 integers in FreeRTOS using pvPortMalloc. Which of the following code snippets correctly performs this allocation and deallocation?

Aint *arr = (int *)pvPortMalloc(10 * sizeof(int)); if(arr != NULL) { // use arr vPortFree(arr); }

Bint *arr = (int *)pvPortMalloc(sizeof(int)); if(arr != NULL) { // use arr vPortFree(arr); }

Cint *arr = (int *)malloc(10 * sizeof(int)); if(arr != NULL) { // use arr free(arr); }

Dint *arr = (int *)pvPortMalloc(10); if(arr != NULL) { // use arr vPortFree(arr); }

Step-by-Step Solution

Solution:

Step 1: Calculate the correct size
To allocate memory for 10 integers, multiply 10 by sizeof(int) to get the total bytes needed.
Step 2: Use pvPortMalloc for allocation
Use pvPortMalloc with the calculated size and cast the returned void pointer to int *.
Step 3: Free the allocated memory
After usage, free the memory using vPortFree to avoid memory leaks.
Final Answer:
int *arr = (int *)pvPortMalloc(10 * sizeof(int)); if(arr != NULL) { // use arr vPortFree(arr); } correctly allocates and frees the memory.
Quick Check:
Allocate size = 10 * sizeof(int), free with vPortFree [OK]

Quick Trick: Multiply count by sizeof(type) for allocation [OK]

Common Mistakes:

Allocating only sizeof(int) bytes instead of 10 times
Using standard malloc/free instead of pvPortMalloc/vPortFree
Allocating 10 bytes instead of 10 integers

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You need to allocate memory for an array of 10 integers in FreeRTOS using pvPortMalloc. Which of the following code snippets correctly performs this allocation and deallocation?

Step 1: Calculate the correct size

Step 2: Use pvPortMalloc for allocation

Step 3: Free the allocated memory

Final Answer:

Quick Check:

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