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Hello World Quick Start

Create a New Project​

  1. Launch VSCode and click the DejaOS icon in the sidebar
  2. Select Create Project, enter a project name, and choose a storage path
  3. Click Submit to create the project

Project Creation Demo

  1. In your project directory, click the app.dxproj file to open the visual configuration interface
  2. After editing the configuration, click Add Module to add required modules and save

Module Configuration Demo

⚠️ Note:

  • Ensure the selected device model matches your actual hardware
  • If you change the device model, reconfigure all module versions
  • Module versions are not compatible across different device models

Import an Existing Project​

DejaOS offers a variety of GitHub examples. You can download any example and import it into VSCode:

  1. After downloading, open the code directory in VSCode
  2. Make sure the directory contains an app.dxproj file at the root—this is required to activate the extension

Import Example Project Demo

Connect Device & Sync Code​

  1. Click the Not Connected button at the bottom of VSCode and select your device
  2. Click the install button at the bottom of VSCode to download the dependent libraries
  3. Once connected, click syncAll for the initial full sync (this may take a while)

Device Sync Demo

⚠️ Note:

  • Please select an example that matches your connected device model. If they don't match, you can manually modify the device model in app.dxproj and reselect modules versions
  • The first sync must use syncAll. For subsequent development, use sync for faster incremental updates.

Using the Command Line​

If you prefer terminal workflows, automation scripts, or AI-assisted programming, install DejaOS CLI:

npm install -g dejaos-cli

Run the following commands from the project root:

dejaos install
dejaos sync --all
dejaos start

After subsequent code changes, run dejaos run to automatically stop the application, perform an incremental sync, and restart it.

Coding Example: Controls Relay​

Add the following code to your project's main.js to control a relay with a button press:

import logger from "../dxmodules/dxLogger.js";
import dxui from "../dxmodules/dxUi.js";
import std from "../dxmodules/dxStd.js";
import gpio from "../dxmodules/dxGpio.js";
import * as os from "os";

// ui context
let context = {};

function initScreen() {
  // ui init
  dxui.init({ orientation: 1 }, context);
  // Create screen
  let mainView = dxui.View.build("mainView", dxui.Utils.LAYER.MAIN);
  // Create a button control
  let button = dxui.Button.build(mainView.id + "button", mainView);
  // Set button size
  button.setSize(130, 50);
  // Create a label control
  let label = dxui.Label.build(mainView.id + "label", button);
  // Set text content
  label.text("Click");
  // Set text color
  label.textColor(0x000000);
  // Set the position of the text in the button
  label.align(dxui.Utils.ALIGN.CENTER, 0, 0);
  // Listen for button click event
  button.on(dxui.Utils.EVENT.CLICK, handleGpio);
  // Load screen
  dxui.loadMain(mainView);
}

(function () {
  initScreen();
})();

function handleGpio() {
  const gpio_id_dw200 = 44;
  // Init gpio
  let res = gpio.init();
  logger.info("init gpio", res);
  // Request gpio
  res = gpio.request(gpio_id_dw200);
  logger.info("request gpio", res);
  // Output high level to open the relay
  res = gpio.setValue(gpio_id_dw200, 1);
  logger.info("Output high level", res);
  // Get whether the current level is high or low
  res = gpio.getValue(gpio_id_dw200);
  logger.info("The level is now", res);
  // Wait 3 seconds
  os.sleep(3000);
  // Output low level to close the relay
  res = gpio.setValue(gpio_id_dw200, 0);
  logger.info("Output low level", res);
  res = gpio.getValue(gpio_id_dw200);
  logger.info("The level is now", res);
}

std.setInterval(() => {
  dxui.handler();
}, 5);

Run the Project​

  1. After coding, click the sync button to upload changes to your device
  2. Once synced, click start to launch the application
  3. View log output in the VSCode console and observe the device screen

When using the command line, run dejaos run to synchronize and start the project, and run dejaos logs to continuously view real-time device logs.

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Package the Project​

When development is complete, you can package your project as a .dpk installer for deployment:

  1. Click the package button to start packaging
    alt text
  2. The installer will be saved in the .temp/ folder within your project directory

.dpk files are DejaOS-specific installers, suitable for OTA or serial deployment

Next Steps​