What is the correct method of waiting for an OK or a > from a board

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Hi All,

This related to a question asked a little while ago in
a for loop not loop not looping[^]
I am using the WaitForData routine but need to modify it
so as the

C#

while (timeWaited < Timeout  && myComPort.BytesToRead < NbDataToWait)

which when used as

C#

Value = WaitForData(4, 100);

will wait for 4 Bytes of data and time out 100 mS, I would like it to wait a > coming back that the board has seen the command. A better way (faster) would be to wait for an OK from the board would it be more sensible method be below demoed in a button click

C#

<pre lang="cs">private void button1_Click(object sender, EventArgs e)
      {
          string TextContaing;
          int LocationOf;

          TextContaing = textBox1.Text;
          MessageBox.Show(TextContaing);


          LocationOf = TextContaing.IndexOf(">");
          if (LocationOf > 0)
          {
              MessageBox.Show("Got One!   "+LocationOf.ToString());
          }

      }

What is the correct method of waiting for an OK or a > from the board

Posted 15-Feb-12 4:26am

glennPattonWork3

Updated 15-Feb-12 4:27am

v2

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Kreagan Naicker · Answer 1 · 2012-02-15T08:45:00

Hi.

You could try this. It should read all the data on COM3 and return the values.
Thereafter it is a simple case of checking for the ">" character.

Unfortunately without any further information i cannot provide a more accurate solution.

C#

static bool WaitForData(int NbDataToWait, int Timeout)
        {
            bool Result = false;
            int TimeWaited = 0;
            System.IO.Ports.SerialPort SPort = new System.IO.Ports.SerialPort();

            SPort.PortName = "COM3";
            SPort.Open();

            byte[] MyResult = new byte[SPort.BytesToRead];

            SPort.Read(MyResult, 0, SPort.BytesToRead);

            while (TimeWaited < Timeout && SPort.BytesToRead < NbDataToWait)
            {
                for (int i = 0; i < MyResult.Length; i++)
                {
                    if (MyResult[i].ToString() == ">")
                    {
                        Result = true;
                    }
                }

                TimeWaited++;
            }

            return Result;
        }