C# code to connect to a FTDI device using their FTD2XX library

FTDIConnect.cs

#region FTDI
static public FTDI myDevice; //do not forget to initialize this in the call to Load()
public UInt32 ftdiDeviceCount = 0;
public FTDI.FT_DEVICE_INFO_NODE[] ftdiDeviceList;
private bool ConnectionInit()
{
    //Check that there is a device connected
    if (myDevice == null)
        myDevice = new FTDI();
    int deviceCount = countDevices();
    if (deviceCount <= 0)
    {
        Log("No device connected.");
        return false;
    }
    //Connect to the device
    FTDI.FT_STATUS ftStatus = myDevice.OpenByDescription("PAD+ v1.0");
    if (ftStatus != FTDI.FT_STATUS.FT_OK)
    {
        Log("Error connecting to FTDI chip.");
        return false;
    }
    //purge the buffers
    do
    {
        ftStatus = myDevice.StopInTask();
    } while (ftStatus != FTDI.FT_STATUS.FT_OK);
    ftStatus = myDevice.Purge(FTDI.FT_PURGE.FT_PURGE_RX | FTDI.FT_PURGE.FT_PURGE_TX);
    do
    {
        ftStatus = myDevice.RestartInTask();
    } while (ftStatus != FTDI.FT_STATUS.FT_OK);
    myDevice.SetLatency(2);
    return true;
}
private int countDevices()
{
    FTDI.FT_STATUS ftStatus = FTDI.FT_STATUS.FT_OK;
    ftStatus = myDevice.GetNumberOfDevices(ref ftdiDeviceCount);
    if (ftStatus != FTDI.FT_STATUS.FT_OK)
        return 0;
    if (ftdiDeviceCount > 0)
    {
        //allocate device info list
        ftdiDeviceList = new FTDI.FT_DEVICE_INFO_NODE[ftdiDeviceCount];
        //populate list
        ftStatus = myDevice.GetDeviceList(ftdiDeviceList);
        if (ftStatus == FTDI.FT_STATUS.FT_OK)
        {
            return (int)ftdiDeviceCount;
        }
        else
            return 0;
    }
    else
        return 0;
}
#endregion