/// <summary>
/// Connect to a given reader or port with a specified timeout on the ping response
/// </summary>
/// <param name="deviceName">Name of Device</param>
/// <param name="timeout">Timeout in ms</param>
/// <returns></returns>
public bool ConnectWithTimeout(string deviceName, int timeout)
{
Command cmd = new Ping();
AutoResetEvent receivedResp = new AutoResetEvent(false);
bool success = false;
if (!conn.Connect(deviceName))
{
return(false);
}
Callback resp = (ResponseFrame frame, Exception e) =>
{
if (TcmpFrame.IsValidFrame(frame))
{
success = true;
}
receivedResp.Set();
};
SendCommand(cmd, resp);
receivedResp.WaitOne(timeout);
if (success)
{
DeviceName = deviceName;
}
return(success);
}
private void DataReceivedHandler(object sender, EventArgs e)
{
Debug.WriteLine("Data is being recieve");
if (!conn.IsOpen() && responseCallback != null)
{
responseCallback(null, new HardwareException("Connection to device is not open"));
}
Debug.WriteLine($" Before: {BitConverter.ToString(buffer.ToArray())}");
if (conn.Read(this.buffer) == 0)
{
return;
}
Debug.WriteLine($" After: {BitConverter.ToString(buffer.ToArray())}");
ResponseFrame resp;
buffer = TcmpFrame.RemoveEscapeCharacters(buffer.ToArray());
for (int i = 0; i < buffer.Count; i++)
{
resp = null;
try
{
if (buffer[i] == 0x7E)
{
resp = ExtractFrame(i);
if (resp != null)
{
buffer.RemoveRange(0, resp.FrameLength + i);
Debug.WriteLine(string.Format("Command family: {0:X}, {1:X}\nResponse Code: {2:X}", resp.CommandFamily[0], resp.CommandFamily[1], resp.ResponseCode));
responseCallback?.Invoke(resp, null);
i -= 1;
}
}
}
catch (LackOfDataException exc)
{
if (buffer.Count > 1 && buffer[buffer.Count - 1] == 0x7E)
{
responseCallback?.Invoke(null, exc);
FlushBuffer();
}
}
catch (LcsException exc)
{
responseCallback?.Invoke(null, new LcsException(this.buffer.ToArray(), "There is an error in the length bytes since Len1+Len0+Lcs != 0"));
}
catch (HardwareException exc)
{
responseCallback(null, new HardwareException("Connection to device is not open"));
}
}
}
/// <summary>
/// Checks if the frame given has a CRC error
/// </summary>
/// <param name="frame">Frame to be checked</param>
/// <param name="crc">CRC to be compare to</param>
/// <returns>True if there is a CRC error, false otherwise</returns>
protected static bool HasCrcError(TcmpFrame frame, byte[] crc)
{
List <byte> data = new List <byte>(frame.ToArray());
byte[] temp = CalculateCrc(data.GetRange(1, frame.FrameLength - 4));
if (temp[0] != frame.Crc[0] || temp[1] != frame.Crc[1])
{
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Checks if the frame given has a LCS errors, CRC errors, or other errors
/// </summary>
/// <param name="frame"></param>
/// <returns>True is frame has no errors, false otherwise</returns>
public static bool IsValidFrame(TcmpFrame frame)
{
if (frame == null)
{
return(false);
}
byte[] contents = frame.ToArray();
if (contents.Length < 10)
{
return(false);
}
if (contents[0] != 0x7E)
{
return(false);
}
if (HasLcsError(frame.Len1, frame.Len0, frame.Lcs))
{
return(false);
}
if (frame.Length + 5 != contents.Length)
{
return(false);
}
if (HasCrcError(frame, frame.Crc))
{
return(false);
}
return(true);
}
