从Arduino / C＃应用程序读取和发送串行数据

Question

I have a program that allows several Arduinos to communicate via Serial Port. For example if Arduino1 want to communicate with Arduino3 the user sends a string from Arduino1 and this string appears on Arduino3 and so on. This is working good with SerialMonitor .

The problem is when I try to do the same in my C# application (nothing appears). I tryed this:

//(...)
comPort1.Open();
//(...)
private void comPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    string inData = comPort1.ReadLine();
    msgBoxLog.AppendText(inData); // msgBoxLog = textBox with data received/sent
}
//(...)
private void sendButton_Click(object sender, EventArgs e)
{
    string my_str = "my string";
    msgBoxLog.AppendText(my_str + "\r\n");
    comPort1.WriteLine(my_str + "\r\n");
}

Some notes:

• RtsEnable and DtrEnable are both active
• BaudRate (Arduino / C#) = 1200

Is baudrate value a problem? I must use this value but I'm not sure if it is accepted by C#. I also tryed something like this but with no success.

Answer 1

I have a vague memory about not being able to access UI controls through the dataReceived event. Try this.

private void comPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    string inData = comPort1.ReadLine();
    this.Invoke(new EventHandler(processData));
}

private void processData(object sender, EventArgs e)
{
    msgBoxLog.AppendText(inData);
}

Answer 2

Do you have proper event handler enabled, like in this example?

mySerialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);

http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.datareceived.aspx

ps I'm using "dumb" delay in my software, between write and read serial port, and it's worked fine. Like this:

serialPort1.Write(Data, 0, Data.Length);

System.Threading.Thread.Sleep(500);

try
{
    serialPort1.Read(Data2, 0, Data2.Length);
}
catch (TimeoutException)
{
    errorProvider1.SetError(maskedTextBox1, "timeout");
}
catch (ArgumentNullException)
{
    errorProvider1.SetError(maskedTextBox1, "no answer");
}