MaixCDK APP framework guide

2024-12-21

Introduction

User use steps:

  • When device boot up, will automatically start launcher.
  • Use select one APP to start.
  • Run selected APP.
  • User interact with APP.
  • User exit APP.
  • launcher will start again and wait for user to select APP.

User install new APP:

  • Ensure device is connected to internet(can connect WiFi in app_settings APP).
  • Open maixhub.com/app to find APP, click download button, and a QR code and a install code will be shown.
  • Open app_store APP in device to open camera to scan QR code, or input install code to install the APP.
  • Return to launcher, the new APP will be shown in the list.

Pack APP

If use MaixCDK:

  • Create a app.yaml in your project folder, see below for format.
  • Execute maixcdk release -P maixcam to pack APP for maixcam platform.
  • Then you will find a app_store_v1.0.0.zip in dist folder, this is the APP package.
  • You can upload this package to maixhub.com/app to share with others.
  • Or you can execute maixcdk deploy -P maixcam to serve a local server and a QR code will be shown.
  • Or you can upload this app file to device and execute app_store install app_path.zip to install by command.

If use MaixPy, you can use MaixVision Workstation to release APP, or use maixtool to release manually:

  • Create a app.yaml in your project folder, see below for format.
  • Create a main.py in your project folder, this is the entry of your APP.
  • Execute maixtool release in this folder, dist/app_id_vx.x.x.zip will be generated.
  • You can upload this package to maixhub.com/app to share with others.
  • Or you can execute maixtool deploy to serve a local server and a QR code will be shown.

app.yaml format:

id: my_app                         # unique id, use lowercase and `_` to separate words
name: My APP
name[zh]: 我的应用                  # Chinese name
version: 1.0.0                     # version number, major.minor.patch
icon: assets/my_app.png            # can be png or lottie json file, or empty
author: Sipeed Ltd
desc: My APP description
desc[zh]: 我的应用描述

#### Include files method 1:
#         By default will include all files in project dir except exclude files
exclude:       # not support regular expression, .git and __pycache__ is always exclude
  - .vscode
  - compile
  - build
  - dist
# extra_include:
#   src: dst
#   build/filename123: filename123

#### Include files method 2:
#         White list mode, only include files in files dict.
#         If no this key or value is empty, will use method 1.
# files:
#   - assets
#   - hello.py
#   - main.py


#### Include files method 2.1:
#         White list mode, only include files in files dict.
#         If no this key or value is empty, will use method 1.
# files:
#   assets: assets

exclude is blacklist mode, files is whitelist mode, you can use one of them.

Files convention

  • All app data is stored in /maixapp.
  • Apps are stored in /maixapp/apps.
  • There is a /maixapp/apps/app.info INI file for simple description of installed apps. Install and uninstall APP will update this file.

developer or use can manually copy APP directories here and execute python gen_app_info.py will generate app.info file.

  • APP store in /maixapp/apps/app_id folder, every app must contain app_id executable file, or main.sh shell script, or main.py python script.
  • When boot up APP, the launcher will find file in app_id folder: main.sh -> main.py -> app_id. The main.sh will be executed by sh, main.py will be executed by python3, app_id will be directly executed.
  • All shared data is stored in /maixapp/share.
  • All pictures are stored in /maixapp/share/picture.
  • All video files are stored in /maixapp/share/video.
  • Temporary data can be stored in /maixapp/tmp. Note that this directory is located on the file system (SD card), which differs from the system's /tmp directory. The /tmp directory on the system is a virtual file system in memory, offering faster read/write speeds but with limited memory size. Large files and log files that need to be stored long-term (which may grow over time) are recommended to be placed in the /maixapp/tmp directory.
  • Font files are stored in /maixapp/share/font.
  • Icon files are stored in /maixapp/share/icon.
  • APP's data files created at runtime can be stored in /maixapp/apps/app_id/data.
  • All this path can be get by API maix.app.get_xxx_path, more detail see API doc or maix_app.hpp file.

Switch from APP to anothor APP

Use void maix::app::switch_app(const string &app_id, int idx = -1, const std::string &start_param = "") function to switch APP.

This will exit current APP and start another APP, and parse start_param string to the second APP, the second APP can get this param by maix::app::get_start_param().