FreeRTOS Tutorial: Getting Started with STM32

FreeRTOS on STM32 is a powerful combination for real-time embedded applications. This tutorial guides you through setup and basic usage.

What is FreeRTOS?

FreeRTOS is a popular real-time operating system for microcontrollers. It provides task scheduling, synchronization primitives, and memory management.

Step 1: Set Up Development Environment

• Download STM32CubeIDE (includes FreeRTOS)
• Or use Keil MDK + FreeRTOS source files
• Or VS Code + PlatformIO + FreeRTOS library

Step 2: Create STM32 Project with FreeRTOS

• Open STM32CubeIDE, create new project
• Select your STM32 device (e.g., STM32F407)
• Enable “FREERTOS” in Middleware settings
• Configure FreeRTOS parameters (heap size, tick rate)

Step 3: Create Your First Task

void vTask1(void *pvParameters)
{
    while(1)
    {
        HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);
        vTaskDelay(pdMS_TO_TICKS(500));
    }
}

// In main():
xTaskCreate(vTask1, "Task1", 128, NULL, 1, NULL);
vTaskStartScheduler();

Step 4: Task Synchronization

// Using semaphores
SemaphoreHandle_t xSemaphore;

void vTask1(void *pvParameters)
{
    xSemaphoreTake(xSemaphore, portMAX_DELAY);
    // Critical section
    xSemaphoreGive(xSemaphore);
}

// Create semaphore:
xSemaphore = xSemaphoreCreateMutex();

Best Practices

• Keep tasks short and non-blocking
• Use queues for inter-task communication
• Allocate sufficient stack size
• Enable stack overflow detection during development

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