ADXL345 Driver for STM32 Nucleo-F446RE

This repository provides a custom driver for the ADXL345 accelerometer, designed for seamless integration with the STM32 Nucleo-F446RE board. The driver is implemented as a modular set of source and header files, facilitating straightforward deployment and adaptation across various STM32 boards and microcontrollers.

🚀 Features

• Efficient ADXL345 Driver 📡:Lightweight and optimized driver for the ADXL345 accelerometer, enabling reliable I2C communication.
• I2C Communication 🔄: Manages setup and data exchange with the ADXL345 using the I2C protocol.
• UART Data Transmission 📊: Reads acceleration data (x_acc, y_acc, z_acc) from the ADXL345 and transmits it via UART for real-time monitoring or further processing.
• Modular Architecture 🧩: Organized into separate source and header files for ease of integration into different projects or STM32 microcontrollers.

🛠️ Getting Started

Prerequisites

• STM32 Nucleo-F446RE: The target microcontroller board for this project.
• ADXL345 Accelerometer: A 3-axis accelerometer with I2C communication.
• STM32CubeIDE: Recommended IDE for development and compilation.
• UART Interface: For monitoring or processing the accelerometer data on a connected device.

  

⚙️ Hardware Setup

1. Connect the ADXL345 to the STM32 Nucleo-F446RE:

   • VCC to 3.3V
   • GND to GND
   • SCL to I2C1_SCL (Pin PB8)
   • SDA to I2C1_SDA (Pin PB9)
   • INT1 and INT2 (Optional, for interrupt-driven operation) not utilized in this scope.

2. UART Connection:

   • Tx (Pin PA2) to your UART receiving device.
   • Rx (Pin PA3) to your UART receiving device.

📥 Software Setup

1. Download the core folder containing necessary files
2. Open STM32CubeIDE and setup your MXConfigurations with I2C1 at pins PB8 & PB9 and make use of USART2 on the Asynchronous mode
3. Include driver files in your project:

• ADXL345.c in the Src directory
• ADXL345.h in the Inc directory

4. Replace or adjust your main.c file as needed
5. Build and flash the project to the STM32 Nucleo-F446RE.

📂 Code Structure

• ADXL345.c: Contains implementation details for the ADXL345 driver functions.
• ADXL345.h: Defines function prototypes and constants.
• main.c: Hosts the application code responsible for reading acceleration data and transmitting it via UART.

⚙️ Usage

1. Initialize the I2C and UART peripherals in main.c.
2. Configure the ADXL345 sensor and retrieve acceleration data using functions from ADXL345.c.
3. Transmit acceleration data over UART for real-time monitoring.

Example Code

#include "ADXL345.h"

// Initialize peripherals
MX_I2C1_Init();
MX_USART2_UART_Init();

// Initialize ADXL345
ADXL345_Init();

// Main loop
while (1) {
    float x_acc, y_acc, z_acc;
    
    // Read acceleration data
    TT_GET_ACCELERATIONS();
    
    // Send data over UART
    printf("X: %f, Y: %f, Z: %f\n", x_acc, y_acc, z_acc);
    
    HAL_Delay(500); // Adjust delay as needed
}

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📌 N.B. Note that the ADXL345.c driver file includes two functions for obtaining acceleration data: one for basic data retrieval and another, used in main.c, that converts the data into a string buffer, preparing it for transmission over UART.