public void Start()
{
IsStart = true;
reTryCount = 0;
ReceiveStage = XmodemReceiveStage.WaitForFirstPacket;
SendStage = XmodemSendStage.WaitReceiveRequest;
msgQueue.Clear();
TransThread = new Thread(new ThreadStart(TransThreadHandler));
TransThread.IsBackground = true;
TransThread.Name = "XmodemTransThread";
TransThread.Start();
if (xmodemInfo.TransMode == TransmitMode.Receive)
{
if (StartReceive != null)
{
StartReceive(xmodemInfo, null);
}
}
}
void SendHandler()
{
XmodemMessage msg = null;
lock (msgQueue)
{
if (msgQueue.Count > 0)
{
msg = msgQueue.Dequeue();
}
}
if (msg != null)
{
reTryCount = 0;
switch (msg.MessageType)
{
case XmodemMessageType.NAK:
if (SendStage == XmodemSendStage.WaitReceiveRequest)
{
SendStage = XmodemSendStage.PacketSending;
xmodemInfo.CheckMode = XModemCheckMode.CheckSum;
if (StartSend != null)
{
StartSend(xmodemInfo, null);
}
}
else if (SendStage == XmodemSendStage.WaitReceiveAnswerEndTransmit)
{
SendEOT();
}
else
{
// 通知重发或发头一包
if (ReSendPacket != null)
{
ReSendPacket(xmodemInfo, null);
}
}
break;
case XmodemMessageType.KEY_C:
if (SendStage == XmodemSendStage.WaitReceiveRequest)
{
SendStage = XmodemSendStage.PacketSending;
// 通知发头一包CRC
xmodemInfo.CheckMode = XModemCheckMode.CRC16;
if (StartSend != null)
{
StartSend(xmodemInfo, null);
}
}
break;
case XmodemMessageType.ACK:
if (SendStage == XmodemSendStage.PacketSending)
{
// 通知发下一包
if (SendNextPacket != null)
{
SendNextPacket(xmodemInfo, null);
}
}
else if (SendStage == XmodemSendStage.WaitReceiveAnswerEndTransmit)
{
// 通知中止
//if (AbortTransmit != null)
//{
// AbortTransmit(xmodemInfo, null);
//}
if (EndOfTransmit != null)
{
EndOfTransmit(xmodemInfo, null);
}
IsStart = false;
}
break;
case XmodemMessageType.CAN:
// 通知中止
if (AbortTransmit != null)
{
AbortTransmit(xmodemInfo, null);
}
break;
default:
break;
}
}
else
{
if (waitReceiveEvent.WaitOne(3000))
{
waitReceiveEvent.Reset();
}
else
{
reTryCount++;
if (reTryCount > RetryMax)
{
IsStart = false;
//通知接收超时
if (TransmitTimeOut != null)
{
TransmitTimeOut(xmodemInfo, null);
}
}
}
}
}
private void SendEOT()
{
SendFrameToUart(EOT);
SendStage = XmodemSendStage.WaitReceiveAnswerEndTransmit;
}