Why it is worth attention

It demonstrates a production-oriented multi-process architecture for embedded automotive systems, with hands-on examples of Linux kernel driver interaction (sysfs, V4L2, GPIO), Qt multimedia, real-time charts, and cross-compilation setup.

Who it is for

Embedded Linux developers learning Qt for HMI
Automotive infotainment system engineers
OpenCV/V4L2 camera integration learners
Students or hobbyists working with i.MX6U or similar ARM boards

Use cases

Building a prototype car dashboard with media player and sensor display
Learning how to interface Linux drivers (DHT11, SR04, AP3216C) via sysfs and character devices
Integrating OpenCV or V4L2 camera capture with Qt GUI
Implementing multi-process application management with QProcess

Strengths

Detailed, line-by-line code walkthrough with flowcharts and diagrams
Coverage of both high-level (Qt multimedia, charts) and low-level (V4L2 mmap, ioctl) techniques
Practical cross-compilation configuration for ARM platform
Demonstrates real-time sensor data acquisition with sliding window chart

Considerations

Hardware-specific to i.MX6U (Alientek board); requires specific kernel drivers and sysfs paths
Uses older Qt 5.12.9 and Linux 4.1.15, may need adaptation for newer versions
Does not include complete project build instructions or dependency management
Weather query relies on a specific free API (sojson.com), which may change or become unavailable

README quick start

NIO 智能车机系统 —— 代码框架分析文档

适用读者: 嵌入式Linux/Qt初学者
硬件平台: 正点原子 i.MX6U (NXP ARM Cortex-A7) 开发板
软件环境: Qt 5.12.9, Linux 4.1.15, C++11
屏幕分辨率: 800×480 电容触摸屏
原作者: Deng Zhimao (正点原子 @openedv.com)

一、系统整体架构

本项目是一个嵌入式Linux智能车机系统，模拟汽车中控屏幕功能。整个系统采用多进程架构——一个主菜单程序（Menu）作为总入口，通过 QProcess 启动各个独立的子应用。

┌──────────────────────────────────────────────────────────────────────────┐
│                         NIO 智能车机系统                                   │
│                                                                          │
│   ┌──────────────┐                                                       │
│   │   Menu (主菜单) │ ← 总入口, 800×480, 全屏固定大小                      │
│   │   QProcess    │                                                      │
│   └───┬────┬────┬─┴────┬──────┬──────┬──────┬──────┬───────────────────  │
│       │    │    │      │      │      │      │      │                      │
│       ▼    ▼    ▼      ▼      ▼      ▼      ▼      ▼                      │
│   ┌────┐┌────┐┌────┐┌────┐┌────┐┌────┐┌────┐┌────┐                      │
│   │音乐││视频││传感││相机││V4L2││DHT11││雷达││天气│                      │
│   │播放││播放││仪表││Open││相机││温湿││SR04││HTTP│                      │
│   │器  ││器  ││盘  ││CV  ││    ││度  ││    ││    │                      │
│   └────┘└────┘└────┘└────┘└────┘└────┘└────┘└────┘                      │
│                                                                          │
│   硬件外设:                                                               │
│   ├── AP3216C (光感/接近/红外传感器) —— I2C总线                           │
│

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