I2C EEPROM STM32 HAL Driver

Driver for using Serial EEPROM Products (AT24C family) in STM32 microcontrollers

🔧 Features

• Fully compatible with STM32 HAL — supports all STM32 MCU series
• Universal AT24Cxx support — automatic 8-bit / 16-bit addressing and memory size handling
• Multi-device support — manage multiple EEPROMs independently on the same I²C bus
• MISRA-C-style design — clean, safe, and portable for embedded and safety-critical applications
• Write-protect support — optional GPIO abstraction for controlling the WP (Write Protect) pin
• Optimized memory access — low-overhead and high-speed read/write using efficient HAL wrappers
• Structured configuration — uses I2C_MemoryTypeDef objects for clean, scalable integration
• Modular and portable — works with STM32CubeIDE, Keil, IAR, or Makefile-based environments

⚙️ How to use this library

1. Configure I²C in STM32CubeMX

   • Enable an I²C peripheral (e.g., I2C1)
   • Set I²C Speed Mode to Standard Mode (100 kHz) or Fast Mode (400 kHz)

2. Configure GPIO (Optional)

   • Set up a GPIO Output to control the EEPROM’s Write-Protect (WP) pin

3. Add the Library to Your Project

   • Include i2c_memory.h in your application code
   • Add i2c_memory.c to your compiler
   • Set the STM32 MCU series macro in stm32_i2c_memory_config.h
   • Add the library folder to your compiler’s include paths

4. Define EEPROM Configuration

   • Create one or more I2C_MemoryTypeDef instances
   • Set the I²C handle and the device address (using A0/A1/A2 pin configuration)

🧪 API Reference

Each function returns an I2C_Memory_StatusTypeDef status code.

I2C_Memory_Init(...)

Initializes an EEPROM instance, calculates the full device address, and prepares WP pin (if used).

I2C_Memory_SingleWrite(...)

Writes a single byte to the specified EEPROM memory address.

I2C_Memory_BurstWrite(...)

Writes multiple bytes (burst/page mode) starting from a target memory address.

I2C_Memory_SingleRead(...)

Reads one byte from a specified memory address.

I2C_Memory_BurstRead(...)

Reads multiple bytes from the EEPROM starting at a given address.

💡 Example

A complete working example is available in example/main.c. It demonstrates initialization, reading, writing, and working with multiple devices.

📜 License

This project is released under the MIT License.

👤 Author

Amirhossein Askari
📧 [email protected]
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