• 串口通讯接收数据的处理


    邓工写的一段 c# 串口接收数据的代码,感觉非常的经典,故写了注释,在此标记.

    void _sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
            {
                
    int len, retry = 0;
                
    byte[] rcvData = new byte[2048];

                
    // 数据超过或等于包的长度
                while (_sp.BytesToRead >= 6)
                {
                    
    //读取一个字节,即包起始字节 0xFE
                    while (_sp.BytesToRead > 0)
                    {
                        
    if (Global.Head == _sp.ReadByte())
                        {
                            rcvData[
    0= Global.Head;
                            
    break;
                        }
                    }
                    
    if (_sp.BytesToRead < 2)
                    {
                        
    return;
                    }
                    
    //读出包长度数据
                    _sp.Read(rcvData, 12);
                    len 
    = (rcvData[1<< 8+ rcvData[2];
                    
    //包太长
                    if (len > 2000)
                    {
                        
    return;
                    }
                    
    //如果数据太短,等待1s,以便确定是否数据尚未接收到
                    for (; retry < 100 && _sp.BytesToRead < len; retry++)
                    {
                        Thread.Sleep(
    10);
                    }
                    
    //数据太短 返回
                    if (_sp.BytesToRead < len)
                    {
                        
    return;
                    }
                    
    //读取数据
                    _sp.Read(rcvData, 3, len);
                    
    //校验数据 处理数据
                    if (CheckData(rcvData, len + 3))
                    {
                        rcvData[len 
    + 2= 0;
                        HandelReceivedData(rcvData);
                    }
                }
            }
    对比先前我写的代码,有好几个优点,更加健壮了
     
            //Serial Received Data
            void _sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
            {
                
    int n = _sp.BytesToRead;
                
    byte[] buf = new byte[n];
                _sp.Read(buf, 
    0, n);
                buffer.AddRange(buf);
                
    while(buffer.Count > 5)
                {
                    
    if(0xFE == buf[0])
                    {
                        
    int len = (buf[1<< 8+ buf[2];
                        
    //数据区尚未接收完整
                        if (buffer.Count < len) 
                        {
                            
    break;
                        }
                        
    byte[] ReceiveBytes = new byte[len];
                        buffer.CopyTo(
    0, ReceiveBytes, 0, len);
                        
    if(CheckData(ReceiveBytes))
                        {
                            HandelReceivedData(ReceiveBytes);
                        }
                        buffer.RemoveRange(
    0, len);
                    }
                    
    else
                    {
                        buffer.RemoveAt(
    0);
                    }
                }

            }
     
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  • 原文地址:https://www.cnblogs.com/kakaliush/p/1995425.html
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