yxhu

Hi Chris,
 
I am new to this forums and this is my first post. Recently I have purchased a few ND2s. I setup a very small serial communication program and unfortunatey it didn't work as expected. Here is the setting:
 
On netduino, I am using COM4, the connection to the PC as:
 
ND            ----->  PC
 
SDA(RX)   ----     TX
SCL (TX)   ----     RX
 
 
Program runs on the ND:
 

private static SerialPort _serialPort;

public static void Main()
{
   _serialPort = new SerialPort("COM4", 9600, Parity.None, 8, StopBits.One);
   _serialPort.Open();

    System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();
    byte[] bytesToSend  = encoder.GetBytes("abc");

    while(true){
       _serialPort.Write(bytesToSend, 0, bytesToSend.Length);
    }
}

 
 
Program runs on the PC:
 

public Program()
{
    _serialPort = new SerialPort();
    _serialPort.PortName     = "COM3";
    _serialPort.BaudRate     = 9600;
    _serialPort.DataBits     = 8;
    _serialPort.DiscardNull  = true;
    _serialPort.StopBits     = StopBits.One;
    _serialPort.Parity       = Parity.None;
    _serialPort.DataReceived += _serialPort_DataReceived;
    _serialPort.Open();
}

private void _serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
     var _buffer = new byte[_serialPort.BytesToRead];
      _serialPort.Read(_buffer, 0, _buffer.Length);

     Console.WriteLine(System.Text.ASCIIEncoding.UTF8.GetString(_buffer));
}

  
Basically, I wanted to let ND to keep sending string "abc" to the PC. After I have tried different Baud rates, i.e.  9600, 4800, 2400. I am always getting very wired result at PC end, please see the attached screenshot.

I suspect there might be the Baud rate mismatch. However, I have tripple checked my code, both sides have identical settings on the serial port.

I spent many hours googling with no luck.

On other weird thing was, I needed to set 'DiscardNull = true' on the PC end, otherwise I am getting massive '0x00' bytes from ND.

I am using VS2010, Micro Framework 4.2, Netdunio SDK 4.2.2.2. I started with VS2013, Micro Framework 4.3, and Netduino SDK 4.3.2.1, unforturnately I couldn't debug the program on ND. I always get error  "The debuging target is not in an initialized state; rebooting......", So I have reverted everything back to VS2010, then I could debug the program.

I have also attached the output from "Device capabilities" in the MSDeploy FYI.