private void Scantimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
if (portFound)
{
return;
}
if (!isStarted)
{
return;
}
string[] portnames = SerialPort.GetPortNames();
//查找所有串口
foreach (string pn in portnames)
{
bool flag = false;
for (int i = 0; i < ports.Count; i++)
{
if (ports[i].name == pn)
{
flag = true;
break;
}
}
if (!flag)
{ //添加新出现的串口
PortData port = new PortData(pn, baudRate, maxDataSize);
port.lastCheckTime = DateTime.Now;
ports.Add(port);
Debug.WriteLine("[port scanner]find new port:" + pn);
}
}
//更新各个串口状态
for (int i = 0; i < ports.Count; i++)
{
switch (ports[i].state)
{
case PortScannerState.NewPort:
try
{
//ports[i].port.BaudRate = baudRate;
//ports[i].port.BaudRate = baudSet[ports[i].baudNum];
ports[i].port.Open();
ports[i].lastCheckTime = DateTime.Now;
ports[i].state = PortScannerState.Scanning;
Debug.WriteLine("[port scanner]start scanning:" + ports[i].name + "-" + baudSet[ports[i].baudNum].ToString());
}
catch
{
ports[i].state = PortScannerState.Unavailable;
Debug.WriteLine("[port scanner]cannot start scanning:" + ports[i].name);
}
break;
case PortScannerState.Scanning:
if (DateTime.Now.Subtract(ports[i].lastCheckTime).TotalSeconds > timeout)
{
ports[i].port.Close();
//ports[i].port.DiscardInBuffer();
ports[i].state = PortScannerState.Unavailable;
ports[i].lastCheckTime = DateTime.Now;
Debug.WriteLine("[port scanner]unavilable port(timeout):" + ports[i].name);
}
break;
case PortScannerState.Available:
ports[i].port.Close();
portFound = true;
SerialLink link = new SerialLink(ports[i].name, ports[i].protocol, ports[i].port.BaudRate);
Debug.WriteLine("[port scanner]find port:" + ports[i].name + ports[i].protocol.ToString());
OnFindPort?.Invoke(this, new PortScannerEventArgs(link));
break;
case PortScannerState.Unavailable:
if (ports[i].port.IsOpen)
{
ports[i].port.Close();
ports[i].port.DiscardInBuffer();
}
if (DateTime.Now.Subtract(ports[i].lastCheckTime).TotalSeconds > 1.0)
{
//ports[i].baudNum = (ports[i].baudNum + 1) % baudSet.Length;
ports[i].state = PortScannerState.NewPort;
}
break;
}
}
}
public PortScannerEventArgs(SerialLink l)
{
link = l;
portName = l.Port.PortName;
}
