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  1. #1
    Join Date
    Apr 2014

    Reading Bytes from Serial Ports

    Good day to all,
    Please I need your guide and support on how to use this function:
    ftStatus = myFtdiDevice.Read(readData, numBytesAvailable,ref numBytesRead);
    to read byte from the serial port.This function is part of the DLL that came with the chip(FT2232D) I am using on my board.I want to use the function to read a byte from the serial port and then send the value to the Graphic user interface.Unfortunately I was unable to get the expected value on my GUI.If I send for instance 40,what I get on the GUI are letters instead of the number 40 or at times the GUI will not even respond.Below are my lines of code I used to read the byte from the serial port:

    The following instructions are executed whenever the CHECKBOX is checked

    void checkBox1_CheckedChanged(object sender, EventArgs e)
    UInt32 numBytesRead = 0;
    UInt32 numBytesAvailable = 1;
                 ftStatus = myFtdiDevice.Read(readData, numBytesAvailable, ref numBytesRead);
                 label11.Text =Convert.ToString(ftStatus);
    Below is the definition of the function from the supplied library:
      Read data from an open FTDI device.
    // Parameters:
    //   dataBuffer:
    //     An array of bytes which will be populated with the data read from the device.
    //   numBytesToRead:
    //     The number of bytes requested from the device.
    //   numBytesRead:
    //     The number of bytes actually read.
    // Returns:
    //     FT_STATUS value from FT_Read in FTD2XX.DLL
    publicFTDI.FT_STATUS Read(byte[] dataBuffer, uint numBytesToRead, refuint numBytesRead);
    Your guide and assistance will be highly appreciated in this regard.
    Best regards.

  2. #2
    Join Date
    Apr 2014
    in northeast ohio

    Re: Reading Bytes from Serial Ports

    ok im not expert on this ,maybe someone here is, i do find it interesting
    so in effort to help and looking into it , i did find some interesting examples that use it
    even a open source library or example using ftdi stuff

    additionally what i think you want to send to be displayed is not the status
    (i think that value is more about return codes that describe the data in readData)
    ftStatus = myFtdiDevice.Read(readData, numBytesAvailable, ref numBytesRead);
    label11.Text =Convert.ToString(ftStatus);
    but instead if i understand right it should be something more like
    ftStatus = myFtdiDevice.Read(readData, numBytesAvailable, ref numBytesRead);
    label11.Text =Convert.ToString(readData); // were readdata actually contains the serial data bytes
    either way have a look at the examples below

    hopefully some of these links will help

    a similar question on stack overflow with a working example
    this above appears to have been using the dll from this FTDI site below but im not sure

    open source library
    a example on git hub open source that reads a ftdi device this is the program source code
    this is the full github downloadable / clonable project
    Last edited by willmotil; June 8th, 2014 at 03:34 PM.

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