🚀 STM32F407VG Professional Driver Framework

A production-quality register-level embedded driver framework for the STM32F407VG (ARM Cortex-M4) microcontroller, developed entirely without STM32 HAL, LL libraries, or CubeMX-generated drivers.

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📖 Overview

This project demonstrates the implementation of a professional embedded driver framework for the STM32F407VG microcontroller using direct register programming.

Unlike STM32 HAL or LL libraries, every peripheral driver has been developed from scratch using the STM32 Reference Manual and CMSIS register definitions.

The framework follows a modular architecture commonly used in embedded product development and emphasizes reusable APIs, portability, interrupt-driven design, and professional coding practices.

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✨ Project Highlights

✅ Register-Level Programming

✅ No HAL Library

✅ No LL Library

✅ No CubeMX Generated Drivers

✅ Professional Driver Architecture

✅ Modular Driver Design

✅ Interrupt Support

✅ Callback Mechanism

✅ Timeout Protection

✅ Error Handling

✅ Static Memory Allocation

✅ MISRA-Friendly Coding Style

✅ Production-Oriented APIs

✅ Professional Documentation

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🧩 Supported Drivers

Driver	Status	Features
RCC	✅ Complete	Clock Enable / Reset
GPIO	✅ Complete	Input, Output, Alternate Function
UART	✅ Complete	TX/RX, Ring Buffer, Interrupts
SPI	✅ Complete	Master Mode, Full Duplex
I2C	✅ Complete	Master TX/RX, Interrupts
TIMER	✅ Complete	Counter, Delay, Callback
ADC	✅ Complete	Single & Continuous Conversion
PWM	✅ Complete	Frequency & Duty Cycle Control

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🏗 Driver Architecture

Application Layer
        │
        ▼
Driver APIs
        │
        ▼
Register Layer
        │
        ▼
STM32F407VG Hardware

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📂 Project Structure

stm32-driver-framework
│
├── .github/
│   └── workflows/
│
├── core/
│
├── docs/
│   ├── gpio.md
│   ├── uart.md
│   ├── spi.md
│   ├── i2c.md
│   ├── timer.md
│   ├── pwm.md
│   ├── register_map.md
│   ├── interrupt_flow.md
│   └── uart_protocol.md
│
├── drivers/
│   ├── inc/
│   └── src/
│
├── examples/
│
├── screenshots/
│
├── tests/
│
├── README.md
├── LICENSE
├── requirements.txt
└── .gitignore

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⚙️ Driver Features

🔹 RCC

• Peripheral Clock Enable
• Peripheral Clock Disable
• Peripheral Reset
• Modular APIs

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🔹 GPIO

• Input Mode
• Output Mode
• Alternate Function
• Analog Mode
• Pull-Up / Pull-Down
• Output Speed
• Pin Read
• Pin Write
• Pin Toggle

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🔹 UART

• Blocking Transmission
• Blocking Reception
• Interrupt Mode
• Ring Buffer
• Callback Support
• String APIs
• Integer APIs
• Float APIs
• Hexadecimal APIs

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🔹 SPI

• Master Mode
• Full Duplex Communication
• Interrupt Support
• Callback Support
• Error Detection

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🔹 I2C

• Master Transmit
• Master Receive
• Interrupt Support
• Callback Support
• Error Handling

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🔹 TIMER

• Timer Initialization
• Counter Start/Stop
• Delay APIs
• Counter Read
• Counter Write
• Interrupt Support
• Callback Registration

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🔹 ADC

• Single Conversion
• Continuous Conversion
• Interrupt Mode
• Callback Support
• Timeout Protection

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🔹 PWM

• PWM Initialization
• Duty Cycle Control
• Frequency Control
• Output Enable
• Interrupt Support

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🧪 Testing

The framework includes example applications and validation scripts for driver verification.

Example Applications

• GPIO Demo
• UART Demo
• SPI Demo
• I2C Demo
• TIMER Demo

Python Test Scripts

• test_gpio.py
• test_uart.py
• test_spi.py
• test_adc.py

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💻 Build Environment

Item	Value
IDE	STM32CubeIDE
MCU	STM32F407VG
Language	C17
Compiler	GNU ARM Embedded GCC
Architecture	ARM Cortex-M4
Programming Style	Register-Level

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🚀 Getting Started

Clone the repository

git clone https://github.com/YOUR_USERNAME/stm32-driver-framework.git

Open the project using STM32CubeIDE.

Explore the examples inside the examples folder.

Refer to the documentation available inside the docs folder.

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📚 Documentation

Complete documentation is available for every driver.

Included documents:

• GPIO Driver
• UART Driver
• SPI Driver
• I2C Driver
• TIMER Driver
• PWM Driver
• Register Maps
• UART Protocol
• Interrupt Flow

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📸 Project Screenshots

📂 Project Structure

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📖 Documentation

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GPIO Driver

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UART Driver

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SPI Driver

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I2C Driver

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TIMER Driver

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ADC Driver

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PWM Driver

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Test Suite

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📈 Future Roadmap

• DMA Driver
• CAN Driver
• USB Driver
• Ethernet Driver
• SDIO Driver
• Watchdog Driver
• RTC Driver
• Flash Driver
• Low Power Driver
• FreeRTOS Integration

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🎯 Learning Outcomes

This project demonstrates knowledge of:

• Embedded C
• ARM Cortex-M4 Architecture
• STM32F4 Register Programming
• Peripheral Driver Development
• Interrupt Handling
• Embedded Software Architecture
• Modular Programming
• Professional API Design
• Callback Mechanism
• Static Memory Management
• Embedded Documentation

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🤝 Acknowledgements

• STMicroelectronics
• ARM
• CMSIS
• STM32F407 Reference Manual
• STM32CubeIDE

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📄 License

This project is licensed under the MIT License.

See the LICENSE file for details.

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👨‍💻 Author

Vedula China Venkata Prasanth

🎓 B.Tech – Electronics & Communication Engineering

🏫 Lendi Institute of Engineering and Technology

📍 Andhra Pradesh, India

💻 Embedded Systems | Firmware Development | STM32 | ARM Cortex-M | IoT

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