Edgi-Talk_M55_LVGL Example Project

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Introduction

This example is based on the Edgi-Talk platform, demonstrating the LVGL stress demo running on RT-Thread real-time operating system. It allows users to quickly verify the board-level LCD display driver and the LVGL graphics framework porting, providing a reference for future GUI application development.

LVGL Overview

LVGL (Light and Versatile Graphics Library) is an open-source embedded GUI development framework designed for resource-constrained devices. It provides modern graphical interfaces with optimized CPU and memory usage, running efficiently on both low-end MCUs and more powerful MPU platforms.

Key Features

1. Lightweight Optimized for minimal memory and CPU usage, ideal for low-power devices and resource-constrained environments.

2. Cross-platform Runs on multiple operating systems (FreeRTOS, RT-Thread, Zephyr, Linux) or bare-metal platforms. Only requires display and input drivers to be ported.

3. Rich Widgets Includes buttons, labels, sliders, charts, tables, lists, etc., and allows custom widget extensions.

4. Advanced Rendering Supports anti-aliasing, transparency, gradients, shadows, rounded corners, and animations for modern UIs.

5. Input Device Support Supports touchscreens, capacitive touch, mouse, keyboard, encoder, and multi-touch. Events are unified via LVGL’s event system.

6. Internationalization UTF-8 encoding with support for bidirectional text (e.g., Arabic, Hebrew).

7. Extensibility Flexible themes, styles, and integration with file systems and image decoders.

Applications

LVGL is widely used in:

• Consumer electronics (smart home panels, smartwatches, appliances)

• Industrial HMI and instrumentation

• Automotive displays (central console, passenger screen, instrument cluster)

• Medical devices (portable monitors, handheld instruments)

Ecosystem & Community

LVGL is MIT licensed and supported by SquareLine Studio for GUI design and LVGL Simulator for PC-based development. A large community provides open-source widgets, themes, and porting examples.

Hardware Description

Backlight Interface

MIPI Interface

PWR Interface

BTB Socket

MCU Interface

Software Description

• Developed on the Edgi-Talk platform, running on the M55 application core.

• Example features:

  • Initialize LVGL graphics library

  • Run lv_demo_stress on the LCD

  • Demonstrate rendering and performance testing

• Code structure is clear for understanding display driver integration and LVGL porting.

Usage

Build and Download

1. Open and compile the project.

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

3. Flash the generated firmware to the board.

Running Result

• After flashing and powering on, the system automatically runs lv_demo_stress on the LCD.

• Users can modify applications/main.c to switch to other LVGL demos (e.g., lv_demo_widgets, lv_demo_music).

Notes

• To modify the graphical configuration, use:

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

• Save and regenerate code after modifications.

• If the screen shows no output, check:

  • LCD connections and power supply

  • lv_port_disp.c and lv_port_indev.c match the actual hardware

Startup Sequence

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

⚠️ Strictly follow the flashing order to ensure proper system operation.

---

• If the example fails, first flash Edgi-Talk_M33_S_Template to ensure proper initialization.

• To enable M55, configure in M33 project:

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