STM32F411VE Discovery Board Support Package

Board support package (BSP) for the STM32F411E-DISCO (32F411EDISCOVERY) development board, built on the Embassy async framework.

Hardware

• MCU: STM32F411VE (512KB Flash, 128KB RAM, 100MHz)
• Architecture: ARMv7E-M with FPU
• Target: thumbv7em-none-eabihf
• Debugger: ST-Link/V2 (onboard)

Onboard Features:

• 4 user LEDs: LD3 (orange/PD13), LD4 (green/PD12), LD5 (red/PD14), LD6 (blue/PD15)
• User button on PA0
• L3GD20 3-axis gyroscope (SPI)
• LSM303DLHC e-compass: 3-axis accelerometer + 3-axis magnetometer (I2C)
• MP45DT02 digital MEMS microphone
• CS43L22 audio DAC with class-D speaker driver
• USB OTG Full-Speed with micro-AB connector

Documentation:

• MCU Datasheet
• Discovery Kit User Manual
• L3GD20 Gyroscope Datasheet
• LSM303DLHC E-Compass Datasheet
• MP45DT02 Microphone Datasheet

Setup

# Add Rust target
rustup target add thumbv7em-none-eabihf

# Install probe-rs (if not already installed)
cargo install probe-rs-tools --locked

Quick Start

With your STM32F411E Discovery board connected via USB:

# Test the board connection
probe-rs list

# Run the blinky example to verify everything works
cargo run --example blinky

Building & Flashing

# Basic Hardware Examples
cargo run --example blinky      # Blink green LED (LD4)
cargo run --example leds        # LED patterns demo - all 4 LEDs
cargo run --example button      # Press button to cycle through LEDs

# Sensor Examples
cargo run --example gyro        # Read gyroscope - rotate the board!
cargo run --example compass      # Read accelerometer/magnetometer

# Audio Examples
cargo run --example microphone  # MEMS microphone demo
cargo run --example audio_dac   # Generate beep tones

# Build without flashing
cargo build --release

# Flash with additional output
cargo run --example blinky --release -- --log-level debug

BSP Modules

Hardware Control

• leds - 4 user LEDs (LD3-LD6) with individual and group control
• button - User button (PA0) with polling support
• microphone - MP45DT02 MEMS microphone with PDM interface
• audio - CS43L22 audio DAC with speaker/headphone output and beep generation

Sensors

• gyro - L3GD20 3-axis gyroscope with SPI interface
  • ±250/±500/±2000 dps full scale
  • Temperature sensor
  • Configurable data rates
• compass - LSM303DLHC e-compass with I2C interface
  • 3-axis accelerometer (±2g/±4g/±8g/±16g)
  • 3-axis magnetometer (±1.3 to ±8.1 gauss)
  • Heading calculation
  • Temperature sensor

Examples

Basic Hardware

• blinky - Simple LED blink to verify board setup
• leds - Demonstrate all LED patterns and animations
• button - Button-controlled LED cycling

Sensors

• gyro - Read and display 3-axis angular rate data
• compass - Read accelerometer, magnetometer, and calculate heading

Audio

• microphone - Capture audio from MEMS microphone (simplified demo)
• audio_dac - CS43L22 I2C control interface demo (⚠️ no audio output - see limitations below)

Known Limitations

Audio DAC (CS43L22)

The audio_dac example demonstrates I2C communication with the CS43L22 audio DAC chip but does not produce actual sound. The chip requires:

• I2S peripheral setup - Audio data streaming interface (MCLK, SCK, SD, WS pins)
• Audio PLL configuration - STM32 clock setup for precise audio timing
• Sample streaming - Continuous DMA transfers of audio data
• Advanced beep generator setup - Additional register configuration for tone generation

Current Status:

• ✅ I2C communication works correctly
• ✅ Chip initialization and power control functional
• ✅ Volume and output device configuration works
• ❌ No I2S implementation (requires significant additional code)
• ❌ No audio output (beep tone generator not fully configured)

The audio module serves as a control interface reference for projects that need I2C access to the CS43L22.

Microphone (MP45DT02)

The microphone module is a simplified GPIO demonstration. Full PDM audio capture would require:

• I2S peripheral in PDM mode
• CIC decimation filter implementation
• DMA for continuous sampling

Project Structure

• src/ - BSP library modules
• examples/ - Example applications demonstrating BSP features
• docs/ - Datasheets and reference manuals
• Embed.toml - Probe-rs configuration (chip, protocol, etc.)
• .cargo/config.toml - Build defaults

Configuration Files

.cargo/config.toml

Sets default build target and runner command:

• Target: thumbv7em-none-eabihf
• Runner: probe-rs run --chip stm32f411ve --protocol swd --connect-under-reset

Embed.toml

Additional probe-rs configuration for RTT logging and advanced flashing options.

memory.x

Linker script defining Flash (512KB) and RAM (128KB) layout for STM32F411VE.