//数据包处理函数
private void PacketHandler(SerialRecvMsg recvMsg)
{
if (recvMsg.PacketData.PacketIsAck()) //判断是否是响应数据包, 若是响应, 则将其从重发字典中移除
{
recvMsg.PacketData.generateSendUType();
string key = recvMsg.PacketData.SendUType;
if (key != null)
{
lock (resendDic)
{
if (resendDic.ContainsKey(key))
{
resendDic.Remove(key);
}
}
}
}
#if DEBUG //将发送消息投入调试接收队列中
if (SerialComDebug.isPauseDebug == false) //若当前不是暂停状态
{
recvMsg.RecvTime = DateTime.Now; //记录时间
this.DebugQueue_Enqueue(recvMsg);
}
#endif
recvMsg.IsFromExtern = true; //外部消息
this.RecvQueue_Enqueue(recvMsg); //投入接收消息队列中
}
//串口数据接收状态机
private void RecvPacketStateMachine(byte RecvByte)
{
switch (CurrentRecvState)
{
case RECVPACKSTATE.IdleState: //空闲态
if (RecvByte == (byte)0x5A)
{
CurrentRecvState = RECVPACKSTATE.StartFieldState;
}
else
{
CurrentRecvState = RECVPACKSTATE.IdleState;
}
break;
case RECVPACKSTATE.StartFieldState: //接收起始符
if (RecvByte == (byte)0xA5)
{
CurrentRecvState = RECVPACKSTATE.DataPacketState;
DataCnt = 0;
}
else
{
CurrentRecvState = RECVPACKSTATE.IdleState;
}
break;
case RECVPACKSTATE.DataPacketState: //接收数据
if (DataCnt < 19)
{
RecvDataField[DataCnt] = RecvByte;
DataCnt++;
CurrentRecvState = RECVPACKSTATE.DataPacketState;
}
else
{
RecvDataField[DataCnt] = RecvByte;
//若校验通过, 则解析数据
if (AppUtil.GetChecksum(RecvDataField, 0, 19) == RecvDataField[19])
{
byte DIRECT = (byte)(RecvDataField[0] >> 4); //指令方向, 先过滤一些数据
if (DIRECT == 0x02 || DIRECT == 0x04 || DIRECT == 0x08) //2:(终端-主机), 4:(中继-主机), 8:(非本组设备之间的通信)
{
SerialRecvMsg recvMsg = new SerialRecvMsg();
Array.Copy(RecvDataField, 0, recvMsg.PacketData.DataBytes, 2, RecvDataField.Length);
recvMsg.PacketData.updateDataBytesToField(); //将接收到的字节更新到数据包的各个字段(如dir, path, cmd等)
PacketHandler(recvMsg);
}
}
CurrentRecvState = RECVPACKSTATE.IdleState;
}
break;
default:
CurrentRecvState = RECVPACKSTATE.IdleState;
break;
}
}
//从接收队列中取走消息, 返回null代表无消息
public SerialRecvMsg RecvQueue_Dequeue()
{
SerialRecvMsg recvMsg = null;
if (serialRecvQueue.Count > 0)
{
lock (this.serialRecvQueue) { recvMsg = serialRecvQueue.Dequeue(); }
}
return(recvMsg);
}
//向接收队列中投递消息
public bool RecvQueue_Enqueue(SerialRecvMsg recvMsg)
{
lock (this.serialRecvQueue) { serialRecvQueue.Enqueue(recvMsg); }
RecvQueueWaitHandle.Set();
return(true);
}
//从重发字典中取出消息, 判断是否超时, 然后投入"底层发送队列"
private void SerialResend()
{
DateTime dtNow;
List <string> list = new List <string>();
while (true)
{
if (serialPortIsOpen && (resendDic.Count > 0))
{
lock (resendDic)
{
dtNow = DateTime.Now;
list.Clear();
//遍历重发字典, 查找超时的消息, 并进行响应操作
foreach (var sendMsg in resendDic)
{
if ((int)((dtNow - sendMsg.Value.SendTime).TotalMilliseconds) > sendMsg.Value.SendWaitTime) //若超时
{
list.Add(sendMsg.Key); //将超时消息的键存入list中, 为后面的移除工作做准备
if (sendMsg.Value.SendNumMax > 0) //若重发次数大于0, 则继续投入发送队列中
{
this.SendQueue_Enqueue(sendMsg.Value);
}
else //若不能再重发了, 则投入接收处理的队列中
{
SerialRecvMsg recvMsg = new SerialRecvMsg();
recvMsg.PacketData = sendMsg.Value.PacketData;
//将发送命令变为响应
if (recvMsg.PacketData.Cmd != 0x09)
{
recvMsg.PacketData.Cmd += 1;
}
else
{
recvMsg.PacketData.Cmd = 0x10;
}
recvMsg.IsFromExtern = false; //内部消息(由于多次重发还是未收到响应导致)
this.RecvQueue_Enqueue(recvMsg); //投入接收消息队列中
#if DEBUG //将发送消息投入调试队列中
if (SerialComDebug.isPauseDebug == false) //若当前不是暂停状态
{
recvMsg.RecvTime = DateTime.Now; //记录时间
this.DebugQueue_Enqueue(recvMsg);
}
#endif
}
}
}
//将超时消息从重发字典中移除
if (list.Count > 0)
{
foreach (string key in list)
{
resendDic.Remove(key);
}
}
}
}
Thread.Sleep(5);
}
}