STM32U5 Development Project

A comprehensive Zephyr RTOS development project for the STM32U585 IoT Discovery Kit (B-U585I-IOT02A), featuring sensor integration, wireless connectivity, and embedded systems development examples.

🎯 Project Overview

This project demonstrates modern embedded development on the STM32U585 microcontroller using Zephyr RTOS, with a focus on:

• Comprehensive sensor integration - Environmental, motion, audio, and distance sensing
• Wireless connectivity - Wi-Fi networking with EMW3080 module
• Modern C++ sensor abstractions - Object-oriented sensor driver design
• Custom driver development - STM32U5-specific audio (MDF/ADF) and sensor drivers
• Real-time data processing - Continuous sensor monitoring and data fusion

🏗️ Project Structure

├── hello_world/          # Basic Zephyr "Hello World" example
├── sensors/              # Advanced sensor integration project (C++)
├── wifi/                 # Wi-Fi connectivity with EMW3080 module
├── zephyr_env.sh         # Zephyr development environment setup
└── README.md            # This file

🛠️ Hardware Platform

STM32U585 IoT Discovery Kit (B-U585I-IOT02A)

• MCU: STM32U585AII6Q (Arm Cortex-M33 with TrustZone)
• Memory: 2 MB Flash, 786 KB SRAM
• Power: Integrated SMPS for ultra-low power operation
• Debug: STLINK-V3E with real-time logging

Integrated Sensors & Connectivity

Component	Status	Implementation
HTS221 (Humidity/Temperature)	✅ Working	Full I²C driver with continuous sampling
IIS2MDC (Magnetometer)	✅ Working	3-axis magnetic field measurements
ISM330DHCX (IMU)	✅ Working	6-axis accelerometer + gyroscope
LPS22HH (Pressure)	✅ Working	Barometric pressure + temperature
VEML6030/7700 (Ambient Light)	✅ Working	Ambient light sensing with lux calculations
VL53L5CX (Time-of-Flight)	⚠️ Partial	Hardware detection (ULD firmware pending)
MP23DB01HPTR (PDM Mics)	⚠️ In Progress	Custom STM32U5 MDF driver development
EMW3080 (Wi-Fi)	🔧 Under Development	802.11 b/g/n connectivity via SPI
STM32WB5MMG (Bluetooth LE)	❌ Future	BLE 5.0 support planned

🚀 Getting Started

Prerequisites

1. Zephyr SDK (v0.17.4+) with ARM toolchain
2. West build tool for Zephyr
3. STM32CubeProgrammer for flashing
4. macOS development environment (project configured for macOS)

Environment Setup

# Source the Zephyr environment
source zephyr_env.sh

# Verify toolchain installation
arm-zephyr-eabi-gcc --version
west --version

Build & Flash Examples

Hello World (Basic)

cd hello_world
west build -b b_u585i_iot02a -p always
west flash

Sensor Integration (Advanced)

cd sensors
west build -b b_u585i_iot02a -p always
west flash

Wi-Fi Connectivity

cd wifi
west build -b b_u585i_iot02a -p always
west flash

📊 Project Details

1. Hello World (hello_world/)

Language: C
Purpose: Basic Zephyr introduction and board verification

Simple "Hello World" application that prints system information every second. Perfect for:

• Verifying toolchain setup
• Testing board connectivity
• Learning basic Zephyr development

2. Sensor Integration (sensors/)

Language: C++
Purpose: Comprehensive sensor data acquisition and processing

Advanced sensor monitoring application featuring:

• Real-time sensor fusion - Continuous monitoring of all operational sensors
• Object-oriented design - Modern C++ sensor class abstractions
• Custom drivers - STM32U5-specific MDF/ADF audio interface
• Data processing - RMS audio level calculation, motion detection
• Sensor status reporting - Detailed logging and error handling

Key Features:

• Environmental monitoring (temperature, humidity, pressure, light)
• Motion sensing (3-axis magnetometer, 6-axis IMU)
• Audio capture (PDM microphones with RMS calculation)
• Distance measurement (Time-of-Flight sensor)

3. Wi-Fi Connectivity (wifi/)

Language: C
Purpose: Network connectivity with EMW3080 Wi-Fi module

Wi-Fi networking application providing:

• Station mode support - Connect to existing Wi-Fi networks
• Network scanning - Discover available access points
• Shell interface - Interactive Wi-Fi and network commands
• DHCP/DNS support - Automatic network configuration
• Protocol testing - SPI communication and MIPC protocol validation

🔧 Development Features

Custom Driver Development

• STM32U5 MDF/ADF driver for PDM microphones
• VL53L5CX Time-of-Flight sensor integration
• EMW3080 Wi-Fi module with SPI interface

Modern Development Practices

• C++17 sensor abstractions with consistent interfaces
• Zephyr device tree configuration
• CMake build system with modular driver organization
• Comprehensive logging with configurable log levels

Debugging & Monitoring

• Real-time sensor data via UART console
• STLINK-V3E debugging with GDB support
• West flash integration for rapid development cycles

📋 Development Roadmap

Current Focus (Q3 2024)

• ✅ Core sensor integration complete
• 🔧 PDM microphone driver optimization
• 🔧 Wi-Fi connectivity stabilization

Next Phase

• 📅 VL53L5CX ULD firmware integration
• 📅 Bluetooth LE (STM32WB5MMG) implementation
• 📅 STSAFE-A110 secure element integration

Future Enhancements

• 📅 Sensor data logging to external memory
• 📅 Over-the-air (OTA) firmware updates
• 📅 Cloud connectivity and IoT integration

🏷️ Technical Specifications

Development Environment:

• Zephyr RTOS v4.2.0+
• ARM Cortex-M33 toolchain
• West build system
• macOS-optimized development setup

Communication Interfaces:

• I²C2 (sensors), SPI2 (Wi-Fi), UART4 (Bluetooth)
• MDF/ADF (audio), OCTOSPI (external memory)
• USB Type-C (debug/programming)

Power Management:

• Ultra-low power design with SMPS
• Configurable sensor sampling rates
• Sleep mode support (future)

📄 License

SPDX-License-Identifier: Apache-2.0

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Target Audience: Embedded systems developers, IoT engineers, STM32 enthusiasts, and Zephyr RTOS learners looking for comprehensive sensor integration and wireless connectivity examples.