Jtro的技术分享:unity的串口通讯

今天一天时间都在面向Google编程.这也蛮头疼的,哈哈

WeChat Image_20200707170558.jpg

串行接口（串口）通常指COM接口，是采用串行通信方式的扩展接口。串口按位（bit）发送和接收字节。尽管比按字节（byte）的并行通信慢，但是串口可以在使用一根线发送数据的同时用另一根线接收数据。特别适用于无网络通信。软硬件结合.
首先需要一块硬件开发同学的一块板子,里面刷好了他预制的"系统",然后给你一份测试说明:

说明文档.PNG

然后你还需要一个串口测试工具,这个工具我会放在下方评论区
按照硬件开发同学约定好的,设置串口通讯工具的配置,点击"手动发送",即可看到返回的消息

笨小孩测试工具.PNG
到这里,确定这个串口通讯正常.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO.Ports;
using System.Threading;
using System;
using System.Text;
using UnityEngine.UI;
using System.IO;

public class PortController : MonoBehaviour
{ 
    //public GUIText gui;
    //定义基本信息
    public string portName = "COM3";
    public int baudRate = 115200;
    public Parity parity = Parity.None;
    public int dataBits = 8;
    public StopBits stopBits = StopBits.One;

    public string[] data;//用于存储6位数据
    SerialPort sp = null;//串口控制
    Thread dataReceiveThread;
    //发送
    string message = "";

    string filename;
    //byte[] message=new byte[8];
    void Start()
    {

        filename = Application.dataPath + @"\StreamingAssets\配置文件.txt";
        portName = ReadALine(filename, 1);
        baudRate = int.Parse(ReadALine(filename, 3));


        OpenPort();//打开串口
        dataReceiveThread = new Thread(new ThreadStart(DataReceiveFunction));//数据接收线程
        dataReceiveThread.Start();

        WriteData(strToToHexByte("01 03 00 00 00 03 05 CB "));
    }

    public void OpenPort()
    {
        sp = new SerialPort(portName, baudRate, parity, dataBits, stopBits);
        sp.ReadTimeout = 400;
        try
        {
            sp.Open();
        }
        catch (Exception ex)
        {

            Debug.Log(ex.Message);

        }
    }


    public void WriteData(byte[] bys)
    {
        if (sp.IsOpen)
        {
            sp.Write(bys, 0, bys.Length);
            Debug.Log("发送完成");
        }
    }

    void OnApplicationQuit()
    {
        ClosePort();
    }

    public void ClosePort()
    {
        try
        {
            sp.Close();
        }
        catch (Exception ex)
        {
            Debug.Log(ex.Message);
        }
    }

    //数据接收功能
    void DataReceiveFunction()
    {
        byte[] buffer = new byte[128];
        int bytes = 0;
        //定义协议
        //int flag0 = 0xFF;
        //int flag1 = 0xAA;
        int index = 0;//用于记录此时的数据次序
        while (true)
        {
            Thread.Sleep(100);
            if (sp != null && sp.IsOpen)
            {
                try
                {
                    bytes = sp.Read(buffer, 0, buffer.Length);
                    data = new string[bytes];
                    for (int i = 0; i < bytes; i++)
                    {
                        data[index] = buffer[i].ToString("X2");
                        index++;
                    }
                    Debug.Log(buffer[0]);
                    Debug.Log(data[0]);

                    //for (int i = 0; i < bytes; i++)
                    //{

                    //    if (buffer[i] == flag0 || buffer[i] == flag1)
                    //    {
                    //        index = 0;//次序归0 
                    //        continue;
                    //    }
                    //    else
                    //    {
                    //        if (index >= data.Length) index = data.Length - 1;//理论上不应该会进入此判断，但是由于传输的误码，导致数据的丢失，使得标志位与数据个数出错
                    //        data[index] = buffer[i];//将数据存入data中
                    //        index++;
                    //    }
                    //}
                }
                catch (Exception ex)
                {
                    Debug.Log(ex.Message);
                    if (ex.GetType() != typeof(ThreadAbortException))
                    {
                    }
                }
            } 
        }
    }
    public string ReadALine(string FileName, int linenumber) // 参数1:打开的文件(路径+文件命),参数2:读取的行数
    {
        string[] strs = File.ReadAllLines(FileName);
        if (linenumber == 0)
        {
            return "0";
        }
        else
        {
            return strs[linenumber];
        }
    }
    private static byte[] strToToHexByte(string hexString)
    {
        hexString = hexString.Replace(" ", "");
        if ((hexString.Length % 2) != 0)
            hexString += " ";
        byte[] returnBytes = new byte[hexString.Length / 2];
        for (int i = 0; i < returnBytes.Length; i++)
            returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);   
        return returnBytes;
    }
    IEnumerator Wirte(byte[] bsy)
    {
        yield return new WaitForSeconds(0.5f);
        WriteData(bsy);
    }
}

注意,这里只是hex格式的数据文件,也就是16进制的格式,其他格式的用到了我在更新.

运行之后的结果:

运行结果.PNG