private void SerialPort_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
try
{
var recivemsg = ReadMsgFromPort();
while (recivemsg != null)
{
if (recivemsg is IBackMsg)
{
//接收到其他信息就当作时回复
backMsg = recivemsg;
resetEvent.Set();
}
else
{
//接收到事件消息冒泡出去
ReciveEvent(recivemsg);
}
recivemsg = ReadMsgFromPort();
}
}
catch (Exception ex)
{
OnIODebug?.Invoke(ex.ToString(), null);
}
//int Existlen = serialPort.BytesToRead;
//if (Existlen >=8)
//{
// byte[] bts = new byte[Existlen];
// serialPort.Read(bts, 0, bts.Length);
// OnIODebug?.Invoke("丢弃数据:", bts);
//}
}
/// <summary>
/// 回应数据
/// </summary>
/// <param name="msg"></param>
public void BackMsg(Message msg)
{
if (msg == null)
{
return;
}
lock (this)
{
try
{
isbuzy = true;
if ((System.DateTime.Now - LastSend).TotalMilliseconds < 6)
{
System.Threading.Thread.Sleep(6);//如果连续发送需要间隔6毫秒
}
if (msg is ITransMsg)
{
(msg as ITransMsg).TransID = LastReciveTransID;
}
byte[] data = msg.GetMsgData();
OnIODebug?.Invoke(msg.ToString(), data);
backMsg = null;
LastSend = System.DateTime.Now;
serialPort.Write(data, 0, data.Length);
}
catch (Exception ex)
{
throw ex;
}
finally
{
isbuzy = false;
}
}
}
/// <summary>
/// 发送并等待回应
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="msg"></param>
/// <param name="timeout"></param>
/// <returns></returns>
public T SendAndBackMsg <T>(Message msg, int timeout) where T : Message
{
lock (this)
{
try
{
isbuzy = true;
if ((System.DateTime.Now - LastSend).TotalMilliseconds < 6)
{
System.Threading.Thread.Sleep(6);//如果连续发送需要间隔6毫秒
}
if (msg is ITransMsg && !msg.MsgDataPacked)
{
(msg as ITransMsg).TransID = GetNextTransID();
}
byte[] data = msg.GetMsgData();
OnIODebug?.Invoke("发送\r\n" + msg.ToString(), data);
backMsg = null;
LastSend = System.DateTime.Now;
serialPort.Write(data, 0, data.Length);
resetEvent.Reset();
if (!resetEvent.WaitOne(timeout))
{
throw new Exception("接收数据超时");
}
if (!(backMsg is T))
{
throw new Exception("回应的数据与预期不一致");
}
return(backMsg as T);
}
catch (Exception ex)
{
throw ex;
}
finally
{
isbuzy = false;
}
}
}
private Message ReadMsgFromPort()
{
if (serialPort.BytesToRead < 8)
{
return(null);
}
byte[] buffer = new byte[40960];
int bufferlength = 0;
bufferlength = serialPort.Read(buffer, 0, 8);//读取包头
if (buffer[0] != 0xEF || buffer[1] != 0x37)
{
byte[] bts = new byte[serialPort.BytesToRead + bufferlength];
Array.Copy(buffer, bts, bufferlength);
serialPort.Read(bts, bufferlength, serialPort.BytesToRead);
OnIODebug?.Invoke("包头错误", bts);
return(null);
}
int DataLen = (((int)(buffer[6])) << 8) | buffer[7];
int bttoread = serialPort.BytesToRead;
int waittimes = 0;
while (bttoread < DataLen + 4) //没接收完成
{
if (serialPort == null)
{
break;
}
if (!serialPort.IsOpen)
{
break;
}
if (serialPort.BytesToRead > bttoread)
{
bttoread = serialPort.BytesToRead;
waittimes = 0;//一直有数据收到就继续等
}
System.Threading.Thread.Sleep(1);
waittimes++;
if (waittimes > 5)//6毫秒都没收到数据代表没有了
{
break;
}
}
if (bttoread < DataLen + 4)
{
byte[] bts = new byte[serialPort.BytesToRead + bufferlength];
Array.Copy(buffer, bts, bufferlength);
serialPort.Read(bts, bufferlength, serialPort.BytesToRead);
OnIODebug?.Invoke("接收到不完整的帧", bts);
return(null);
}
bufferlength += serialPort.Read(buffer, bufferlength, DataLen + 4);
if (buffer[DataLen + 10] != 0xFE || buffer[DataLen + 11] != 0x73)
{
byte[] bts = new byte[bufferlength];
Array.Copy(buffer, bts, bufferlength);
OnIODebug?.Invoke("包尾错误", bts);
return(null);
}
byte sum = buffer[0];
byte xor = buffer[0];
for (int i = 1; i < bufferlength - 4; i++)
{
sum = (byte)(sum + buffer[i]);
xor = (byte)(xor ^ buffer[i]);
}
if (sum != buffer[DataLen + 8] || xor != buffer[DataLen + 9])
{
byte[] bts = new byte[bufferlength];
Array.Copy(buffer, bts, bufferlength);
OnIODebug?.Invoke("数据校验错误", bts);
return(null);
}
Message recivemsg = Message.ParseFromData(buffer, bufferlength);
if (recivemsg == null)
{
byte[] bts = new byte[bufferlength];
Array.Copy(buffer, bts, bufferlength);
OnIODebug("不支持的指令", bts);
return(null);
}
if (OnIODebug != null)
{
byte[] bts = new byte[bufferlength];
Array.Copy(buffer, bts, bufferlength);
OnIODebug("收到" + recivemsg.ToString(), bts);
}
return(recivemsg);
}