RTOS-Based Indicator System (STM32 + FreeRTOS)

Event-driven automotive indicator system using STM32 & FreeRTOS
State Machine • Multitasking • Queue Communication

---

📌 Overview

This project implements a real-time automotive indicator system using STM32F411RE and FreeRTOS.
It demonstrates task scheduling, inter-task communication, and deterministic state machine behavior.

---

Key Features

• FreeRTOS-based multitasking
• Event-driven architecture (message queues)
• Finite State Machine (FSM)
• Software debouncing + long press detection
• Hazard mode priority handling
• Different blink rates for different states

---

System Architecture

+-------------+
| Button Task |
+-------------+
       |
       v
+------------------+
| Message Queue    |
+------------------+
       |
       v
+------------------+
| Indicator Task   |
| (State Machine)  |
+------------------+
       |
       v
+-------------+
| LED Task    |
+-------------+

---

State Machine

Current State	Input Event	Next State
IDLE	LEFT	LEFT
IDLE	RIGHT	RIGHT
IDLE	BOTH	HAZARD
LEFT	LEFT	IDLE
RIGHT	RIGHT	IDLE
ANY	BOTH	HAZARD
HAZARD	LEFT/RIGHT	IDLE

---

Hardware Used

• STM32F411RE (Nucleo Board)
• Onboard LED (PA5)
• Push Buttons (PC0, PC1)

---

Behavior

Mode	LED Behavior
LEFT	Slow Blink
RIGHT	Slow Blink
HAZARD	Fast Blink
IDLE	OFF

---

Project Structure

Core/ ├── Src/ │ ├── main.c # RTOS tasks + logic │ Drivers/ # HAL drivers RTOS_Indicator.ioc # CubeMX config

---

Getting Started

1. Open project in STM32CubeIDE
2. Connect STM32 Nucleo board
3. Build & Flash
4. Press buttons to control indicator modes

---

🎯 Learning Outcomes

• RTOS scheduling & task prioritization
• Queue-based inter-task communication
• Embedded state machine design
• Hardware interfacing with STM32 HAL

---

Demo

• 
• 
• 

---

Author

Pranav Krishnakumar Iyer