Unity程序联动rs485可编程开关

开发工具：Unity2018.3.7

需要设备：rs485可编程开关，rs485信号转rs232信号转换头，usb串口线，12伏电源

编程开关类似下面：

转换器和串口线：

 

最近公司许多项目用到了串口通讯联动，比如rs485开关面板控制程序影片，网络继电器控制模型启动开关，还涉及了关于Unity打包ipad测试程序，写个博客记录一下，本篇主要是记录rs485开关面板控制程序联动这块。

因为之前是开发Unity程序这块，对串口通讯不太清楚，本篇也只是记录联动开关的用法，具体原理就不深究

首先程序需求为开关面板三个按钮控制pc端程序视频的开始，暂停，播放，播放结束回到待机界面，程序很简单，用的是avproVideo插件里面内置的方法来完成对视频的操作，接着Unity要进行简单的串口通讯需要引入命名空间System.IO.Ports;

这里有一点需要注意，需要将PlayerSettings中Other Settings中Api Compatibility Level改为.NET 4.x,不然会找不到该引用。

接下来是XMl配置文档，用来在外部修改串口号，控制影片是否循环，也方便更改不同可编程开关的触发代码

然后是读取xml的脚本：

using UnityEngine;
using System.Xml;

public class Config_XuTing : MonoBehaviour
{
    private string configPath;
    [HideInInspector]
    public string play_code;
    [HideInInspector]
    public string pause_code;
    [HideInInspector]
    public string replay_code;
    [HideInInspector]
    public string com;
    [HideInInspector]
    public bool loop;
    [HideInInspector]
    public string port;
    public static Config_XuTing instance;
    private void Awake()
    {
        instance = this;
        configPath = Application.streamingAssetsPath + "/config.xml";
        ReadXml();
    }

    void ReadXml()
    {
        XmlDocument doc = new XmlDocument();
        XmlReaderSettings settings = new XmlReaderSettings();
        settings.IgnoreComments = true;//忽略文档里面的注释
        XmlReader reader = XmlReader.Create(configPath, settings);
        doc.Load(reader);
        //doc.LoadXml(configPath);
        XmlNode root = doc.SelectSingleNode("root");
        loop = ((XmlElement)root.SelectSingleNode("video")).GetAttribute("loop") == "1";
        play_code = ((XmlElement)root.SelectSingleNode("play")).GetAttribute("code");
        pause_code = ((XmlElement)root.SelectSingleNode("pause")).GetAttribute("code");
        replay_code = ((XmlElement)root.SelectSingleNode("replay")).GetAttribute("code");
        com = ((XmlElement)root.SelectSingleNode("port")).GetAttribute("com");
    }
}

接下来是串口通讯的base类

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO.Ports;
using System.Threading;
using UnityEngine.Events;

public class RelayBase : MonoBehaviour
{
    private SerialPort sp;
    private string com;
    private Thread recvThread;
    private string recvStr = "";
    private UnityAction recvAction;
    private int recvLen;

    protected int requestLen;
    public string RecvStr
    {
        get { return recvStr; }
        set
        {
            recvStr = value;
        }
    }

    protected virtual void Start()
    {
        recvThread = new Thread(Recv);
        recvThread.Start();
    }


    private void Update()
    {
        if (recvAction != null)
            recvAction.Invoke(RecvStr);
    }

    private void OnApplicationQuit()
    {
        sp.Close();
        if (recvThread != null)
        {
            recvThread.Interrupt();
            recvThread.Abort();
        }
    }


    void Recv()
    {
        byte[] recvBuf = new byte[16];
        string str = "";
        while (true)
        {
            if (sp.IsOpen)
                recvLen = sp.Read(recvBuf, 0, 16);
            if (recvLen > 0)
            {
                for (int i = 0; i < recvLen; i++)
                {
                    str += recvBuf[i].ToString("X2");
                }
                if (str.Length < requestLen)
                    continue;
                RecvStr = str;
                recvAction += delegate (string s)
                {
                    Debug.Log(s);
                    ReceivedCallBack(s);
                    recvAction = null;
                };
                str = "";
                sp.DiscardInBuffer();
                //Thread.Sleep(150);
            }
        }
    }

    protected virtual void ReceivedCallBack(string s)
    {

    }

    protected void InitSerialPort(string com)
    {
        sp = new SerialPort(com, 9600, Parity.None, 8, StopBits.One);
        try
        {
            sp.Open();
        }
        catch
        {
            Debug.Log("串口打开失败");
        }
    }

}

然后是继承RelayBase的脚本，用来接收面板发出的信号：

public class Relay_xuTing : RelayBase
{
    protected override void ReceivedCallBack(string s)
    {
        if (s == Config_XuTing.instance.play_code)
            SystemManager_XuTing.instance.PlayClick();
        else if (s == Config_XuTing.instance.pause_code)
            SystemManager_XuTing.instance.PauseClick();
        else if (s == Config_XuTing.instance.replay_code)
            SystemManager_XuTing.instance.ReplayClick();
        //else if (s == Config_XuTing.instance.stop_code)
        //    SystemManager_XuTing.instance.StopClick();
    }
    protected override void Start()
    {
        InitSerialPort(Config_XuTing.instance.com);
        requestLen = Config_XuTing.instance.play_code.Length;
        base.Start();
    }
}

最后就是UI脚本了SystemManager_XuTing，UI用了AVProVideo插件来播放视频

一个背景UGUI用来播放待机画面的视频，另外一个用来播放主视频，根据收到的串口信号，调用SystemManager_XuTing中播放，暂停和重播方法。

主要脚本都在上面，其中需要将xml文件和需要播放的视频放在StreamingAssets文件夹下，这样打包出来可以随时修改。