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What is DejaOS

Overview​

DejaOS is a JavaScript runtime environment purpose-built for embedded devices, enabling low-cost, resource-constrained smart hardware to run JavaScript code efficiently. By adopting JavaScript as the primary development language, DejaOS dramatically lowers the barrier and cost for embedded development, making the process simpler and more productive.

DejaOS has been successfully deployed in various IoT scenarios, demonstrating excellent performance and development efficiency.

Architecture​

DejaOS is built on the following core components:

  • Mip / ARM Linux: Provides system-level process, thread, and resource management
  • QuickJS: A lightweight, fast JavaScript engine supporting the ES2020 standard
  • LVGL: A popular open-source embedded graphics library, supporting rich UI development in both C and JavaScript

Features​

DejaOS offers a comprehensive set of JavaScript APIs and system capabilities:

Hardware Interface Libraries​

  • GPIO, PWM, UART, RS-485, RS-232, USB, Wiegand, Watchdog
  • Capturer, ALSA, NFC, QRCode, BLE, Face Recognition, and more

Networking & Communication Protocols​

  • Net, TCP, TCP Server, MQTT, UDP, HTTP, Web Server, OSDP, etc.

Graphics Library​

  • Build GUIs in JavaScript, fully compatible with native LVGL features

Utility Libraries​

  • Threads, encryption/decryption, logging, EventBus, NTP, SQLite, and more

Third-Party Libraries​

  • Supports importing ESM-format third-party JavaScript libraries via import

Native C Library Integration​

  • Integrate native C libraries and expose them to JavaScript

Development Workflow​

Environment Setup​

Device Preparation​

  1. Acquire a development device
  2. Connect the device to your computer (VSCode) via USB

Quick Start​

Build & Deploy​

  1. Acquire production devices
  2. Use VSCode to package your project as a .dpk installer
  3. Deploy via OTA or use the DPK installer tool for serial installation

Support​

If you have any questions, feel free to contact us:

📧 Email: service@dxiot.com

We are happy to assist you!