pvPortMalloc and vPortFree in FreeRTOS - Mini Project: Build & Apply

Using pvPortMalloc and vPortFree in FreeRTOS

📖 Scenario: You are working on an embedded system using FreeRTOS. You need to dynamically allocate and free memory safely within your tasks.

🎯 Goal: Learn how to use pvPortMalloc to allocate memory and vPortFree to free that memory in FreeRTOS.

📋 What You'll Learn

Create a pointer variable to hold allocated memory

Define the size of memory to allocate

Use pvPortMalloc to allocate memory

Use vPortFree to free the allocated memory

Print messages to confirm allocation and freeing

💡 Why This Matters

🌍 Real World

Embedded systems often need dynamic memory allocation for buffers or data structures during runtime. Using FreeRTOS memory functions ensures thread safety and proper memory management.

💼 Career

Embedded developers must manage memory carefully to avoid leaks and crashes. Knowing how to use FreeRTOS memory allocation functions is essential for writing reliable multitasking applications.

1

Create a pointer variable for memory allocation

Create a pointer variable called buffer of type char * and initialize it to NULL.

FreeRTOS

char *buffer = NULL;  // Your code here

Need a hint?

Use char *buffer = NULL; to declare a pointer that will hold the allocated memory address.

2

Define the size of memory to allocate

Create a variable called size of type size_t and set it to 100 to represent the number of bytes to allocate.

FreeRTOS

char *buffer = NULL;
size_t size = 0;  // Your code here

Need a hint?

Use size_t size = 100; to define the memory size you want to allocate.

3

Allocate memory using pvPortMalloc

Use pvPortMalloc to allocate memory of size bytes and assign the result to buffer. Use a cast to char *.

FreeRTOS

char *buffer = NULL;
size_t size = 100;
// Your code here

Need a hint?

Call pvPortMalloc(size) and cast it to char * before assigning to buffer.

4

Free the allocated memory and print confirmation

Use vPortFree to free the memory pointed to by buffer. Then print "Memory freed" using printf.

FreeRTOS

char *buffer = NULL;
size_t size = 100;
buffer = (char *)pvPortMalloc(size);
// Your code here

Need a hint?

Call vPortFree(buffer); to free the memory, then printf("Memory freed\n"); to show confirmation.