Hi,
I’m new in 1-Wire and trying to implement communication to DS18S20 via DS9097U in pure C#.
I know about TMEX lib and mapped WinApi calls way, but want to implement communication using SerialPort class.
OneWireViewer works propertly on my hardware but my source has problem with presence detecting and returned temp=85C all the time.
Could you please check my source for Reset and tell me what I’m doing wrong?
Maybe the problem is with port settings, but I can’t find any samples or docs for this point.

Thanks

[Test]
public void DS1820_resetLine()
{
using (SerialPort port = new SerialPort(“COM3″))
{
try
{
port.Open();

port.Parity = Parity.None;
port.DataBits = 8;
port.StopBits = StopBits.One;
port.BaudRate = 9600;

port.DtrEnable = false; // for DS9097
port.RtsEnable = false; // for DS9097
WaitOp(300);
port.DtrEnable = true; // for DS9097
port.RtsEnable = true; // for DS9097
WaitOp(100);
port.BaseStream.Flush();
port.BaseStream.WriteByte(0xE3); //to command mode
port.BaseStream.WriteByte(0xC1); //reset

port.BaseStream.Flush();
WaitOp(1);
byte cmd = (byte)port.BaseStream.ReadByte(); // PROBLEM: never returns
Assert.That(cmd, Is.Not.EqualTo(0));
}
finally
{
port.Close();
}
}
}

public void WaitOp(int ms)
{
Thread.Sleep(ms);
}

Hi,

ok, thanks, you are using WinAPI functions mapping in your project, but I want to do the same via SerialPort class from .Net 2.0. (seems it is not possible because of some port settings issue )

Best Regards,

tz