Edgi-Talk_LSM6DS3 Example Project

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Introduction

This example is based on the Edgi-Talk platform, running on the RT-Thread real-time operating system, demonstrating how to drive the LSM6DS3 six-axis sensor (accelerometer + gyroscope + temperature).

LSM6DS3TR Overview

LSM6DS3TR is a low-power six-axis Inertial Measurement Unit (IMU) from STMicroelectronics, integrating a three-axis accelerometer and a three-axis gyroscope.

Key Features

  • Three-axis accelerometer: ±2/±4/±8/±16 g

  • Three-axis gyroscope: ±125/±245/±500/±1000/±2000 dps

  • Operating voltage: 1.71 V – 3.6 V

  • Low power consumption, supporting multiple power-saving modes

  • Built-in FIFO buffer (up to 8 KB)

  • Supports I²C and SPI communication interfaces

Applications

  • Smartphones and wearable devices

  • Motion detection and posture recognition

  • Gesture recognition and gait analysis

  • Robotics and drone attitude control

Through this example, users can learn to:

  • Use RT-Thread’s I²C device driver framework

  • Initialize and configure LSM6DS3 registers

  • Read three-axis acceleration, three-axis angular velocity, and temperature data

  • Output sensor data via the serial port

Hardware Description

LSM6DS3TR Interface

alt text

BTB Socket

alt text

MCU Interface

alt text

Software Description

  • Developed on the Edgi-Talk platform

  • Uses RT-Thread as the OS kernel

  • Example features include:

    • Detect and verify device ID

    • Reset sensor and restore default configuration

    • Configure output data rate and full-scale range

    • Polling mode to read acceleration, angular rate, and temperature

    • Print sensor data to the serial terminal

Usage

Build and Download

  1. Open the project and compile it.

  2. Connect the board’s USB interface to the PC using the onboard debugger (DAP).

  3. Flash the generated firmware to the board using a programming tool.

Running Result

  • After flashing, power on the board to run the example:

Acceleration [mg]:  15.23   -3.12   1000.45
Angular rate [mdps]: 2.50   -1.25    0.75
Temperature [degC]:  26.54

  • The blue LED will blink at a 500ms period, indicating that the system scheduler is running normally.

Notes

  • To modify the graphical configuration, open the configuration file using the following tool:

tools/device-configurator/device-configurator.exe
libs/TARGET_APP_KIT_PSE84_EVAL_EPC2/config/design.modus

  • After modification, save the configuration and regenerate the code.

Startup Sequence

The system starts in the following order:

+------------------+
|   Secure M33     |
|  (Secure Core)   |
+------------------+
          |
          v
+------------------+
|       M33        |
| (Non-Secure Core)|
+------------------+
          |
          v
+-------------------+
|       M55         |
| (Application Core)|
+-------------------+

⚠️ Please strictly follow the above flashing sequence; otherwise, the system may fail to run properly.

  • If the example does not run correctly, first compile and flash the Edgi-Talk_M33_S_Template project to ensure proper initialization and core startup, then run this example.

  • To enable the M55 core, enable the following configuration in the M33 project:

RT-Thread Settings --> Hardware --> select SOC Multi Core Mode --> Enable CM55 Core