public void SendCommand(SerialDataChannel serial_)
{
try
{
serial_.Write(new byte[] { 0xAA }, 0, 1);
TrueCheckSum = ActualCheckSum;
serial_.Write(comData_, 0, 2);
if (PayLoadLength > 0)
{
serial_.Write(data_, 0, PayLoadLength);
}
}
catch
{
}
}
public static ProtocolError FromStream(ref PacketCommandMini command, SerialDataChannel serial, int timeOut, System.Windows.Forms.TextBox flush = null)
{
long start = DateTime.Now.Millisecond;
bool hasAA = false;
while (!hasAA && (DateTime.Now.Millisecond - start) <= timeOut)
{
if (serial.BytesToRead < 3)
{
continue;
}
if (serial.ReadByte() == 0xAA)
{
hasAA = true;
break;
}
}
if (!hasAA)
{
return(ProtocolError.ReadTimeout);
}
serial.Read(command.comData_, 0, 2);
command.PayLoad = new byte[command.PayLoadLength];
int dlen = command.PayLoadLength;
int i = 0;
while (i < dlen && (DateTime.Now.Millisecond - start) <= timeOut)
{
if (serial.BytesToRead > 0)
{
command.PayLoad[i++] = (byte)serial.ReadByte();
}
}
if (i < dlen) // not all of the bytes were received
{
return(ProtocolError.ReadTimeout);
}
// calculate checksum
if (command.TrueCheckSum != command.ActualCheckSum)
{
return(ProtocolError.CheckSumMismatch);
}
// we got the command. letes return
return(ProtocolError.None);
}