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USB Lighting OpenDMX FTD2XX DMXking

A few quick questions. I have a DMX USB controller lighting controller that I am trying to control.

It is based on the Open DMX protocol (from Entec), which provides the C # class. I have a device connected to the RGB channel, and if I test the USB device with its driver, it connects to COM4, ​​and when I switch my software to transfer mode, I can set separate DMX channels.

Using my OpenDMX class with a few changes (the core is the same, I just added an additional error check, I can find the device, request its information, etc. When I open the device, I get a pen. I can write to this device using FT_Write, but no matter what I do, no lights come up.

Here are some relevant code snippets:

public static byte[] buffer;

[DllImport("FTD2XX.dll")]
public static extern FT_STATUS FT_Open(UInt32 uiPort, ref uint ftHandle);
[DllImport("FTD2XX.dll")]
public static extern FT_STATUS FT_Write(uint ftHandle, IntPtr lpBuffer, UInt32 dwBytesToRead, ref UInt32 lpdwBytesWritten);

public static void writeData()
{
    while (!done)
    {
        try
        {
            initOpenDMX();
            status = FT_SetBreakOn(handle);
            status = FT_SetBreakOff(handle);
            bytesWritten = write(handle, buffer, buffer.Length);
            if (bytesWritten == 0)
            {
                break;
            }

            System.Threading.Thread.Sleep(25);
        }
        catch (Exception)
        {
            break;
        }
    }
    Connected = false;
    done = false;
}

All status is returned as FT_Ok, and bytesWritten is returned as 512 (number of channels on this USB controller)

I keep thinking that I missed something like setting the device to transfer mode or similar (it only has one DMX connector)

public static void initOpenDMX()
{
    status = FT_ResetDevice(handle);
    status = FT_SetDivisor(handle, (char)12); // set baud rate
    status = FT_SetDataCharacteristics(handle, BITS_8, STOP_BITS_2, PARITY_NONE);
    status = FT_SetFlowControl(handle, (char)FLOW_NONE, 0, 0);
    status = FT_ClrRts(handle);
    status = FT_SetLatencyTimer(handle, (byte)40);
    status = FT_Purge(handle, PURGE_TX);
    status = FT_Purge(handle, PURGE_RX);
}

I also tried the Entec OpenDMX class without any changes from me, and it does nothing either.

I just want to emphasize that their control software is working fine, so the lights and the controller are compatible. I think something is missing in the way I use FTD2xx. There are no errors (all this is FT_OK), so this indicates that the DLL is working - especially since I can query the device using the FT_ListDevices and FT_GetDeviceInfo methods.

Any ideas?

Gareth

+3
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5

, . , OpenDMX, DMXProUSB , FTDI, , . ++ example # . - , # DMXProUSB, . manfacturer (dmxking) github: https://github.com/agrath/Sniper.Lighting.Dmx

+4

# dmx. Hippy Open DMX, VB.

// :
http://members.westnet.com.au/rowanmac/opendmx.html#tx
// : https://web.archive.org/web/20150217155014/http://members.westnet.com.au:80/rowanmac/opendmx.html

# - FDDI.

.

FT_SetFlowControl. VB int. # , char.

    [DllImport("FTD2XX.dll")]
    public static extern FT_STATUS FT_SetFlowControl(uint ftHandle, UInt16 usFlowControl, byte uXon, byte uXoff);
+2

Hippy VB VB # . FT_WRITE . # IPtr, .

:

using System;
using System.Runtime.InteropServices;
using System.Threading;

// based on Hippy VB Example
// http://members.westnet.com.au/rowanmac/opendmx.html#tx
// Working link: https://web.archive.org/web/20150217155014/http://members.westnet.com.au:80/rowanmac/opendmx.html

namespace Test
{
class Program
{


    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_Open(short intDeviceNumber, ref int lngHandle);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_Close(int lngHandle);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_SetDivisor(int lngHandle, int div);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_Read(int lngHandle, string lpszBuffer, int lngBufferSize, ref int lngBytesReturned);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_Write(int lngHandle, string lpszBuffer, int lngBufferSize, ref int lngBytesWritten);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_Write(int lngHandle, IntPtr lpBuffer, int lngBufferSize, ref int lngBytesWritten);

    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_SetBaudRate(int lngHandle, int lngBaudRate);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_SetDataCharacteristics(int lngHandle, byte byWordLength, byte byStopBits, byte byParity);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_SetFlowControl(int lngHandle, short intFlowControl, byte byXonChar, byte byXoffChar);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_ResetDevice(int lngHandle);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_SetDtr(int lngHandle);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_ClrDtr(int lngHandle);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_SetRts(int lngHandle);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_ClrRts(int lngHandle);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_GetModemStatus(int lngHandle, ref int lngModemStatus);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_Purge(int lngHandle, int lngMask);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_GetStatus(int lngHandle, ref int lngRxBytes, ref int lngTxBytes, ref int lngEventsDWord);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_GetQueueStatus(int lngHandle, ref int lngRxBytes);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_GetEventStatus(int lngHandle, ref int lngEventsDWord);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_SetChars(int lngHandle, byte byEventChar, byte byEventCharEnabled, byte byErrorChar, byte byErrorCharEnabled);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_SetTimeouts(int lngHandle, int lngReadTimeout, int lngWriteTimeout);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_SetBreakOn(int lngHandle);
    [DllImport("FTD2XX.DLL", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
    private static extern int FT_SetBreakOff(int lngHandle);

    // FTDI Constants
    const short FT_OK = 0;
    const short FT_INVALID_HANDLE = 1;
    const short FT_DEVICE_NOT_FOUND = 2;
    const short FT_DEVICE_NOT_OPENED = 3;
    const short FT_IO_ERROR = 4;

    const short FT_INSUFFICIENT_RESOURCES = 5;
    // Word Lengths
    const byte FT_BITS_8 = 8;
    // Stop Bits
    const byte FT_STOP_BITS_2 = 2;
    // Parity
    const byte FT_PARITY_NONE = 0;
    // Flow Control
    const byte FT_FLOW_NONE = 0x0;
    // Purge rx and tx buffers
    const byte FT_PURGE_RX = 1;

    const byte FT_PURGE_TX = 2;

    public static int handle=0;



    public static byte[] buffer = new byte[4];  // can be up to 512, shorter is faster

    private static string lpszBuffer=""+ (char) 0 + (char) 64 + (char) 64+ (char) 0;


    static void Main(string[] args)
    {
        init();
    }

    public static string init()
    {
        short n = 0;
        // ==== ATTEMPT TO OPEN DEVICE ====
        if (FT_Open(n, ref handle) != FT_OK)
        {
            return "FTTD Not Found";
        }
        // ==== PREPARE DEVICE FOR DMX TRANSMISSION ====
        // reset the device
        if (FT_ResetDevice(handle) != FT_OK)
        {
            return "Failed To Reset Device!";

        }
        // get an ID from the widget from jumpers
     //   GetID(ref n);
        // set the baud rate
        if (FT_SetDivisor(handle, 12) != FT_OK)
        {
            return "Failed To Set Baud Rate!";
        }
        // shape the line
        if (FT_SetDataCharacteristics(handle, FT_BITS_8, FT_STOP_BITS_2, FT_PARITY_NONE) != FT_OK)
        {
            return "Failed To Set Data Characteristics!";
        }
        // no flow control
        if (FT_SetFlowControl(handle, FT_FLOW_NONE, 0, 0) != FT_OK)
        {
            return "Failed to set flow control!";
        }
        // set bus transiever to transmit enable
        if (FT_ClrRts(handle) != FT_OK)
        {
            return "Failed to set RS485 to send!";
        }
        // Clear TX & RX buffers
        if (FT_Purge(handle, FT_PURGE_TX) != FT_OK)
        {
            return "Failed to purge TX buffer!";
        }
        // empty buffers
        if (FT_Purge(handle, FT_PURGE_RX) != FT_OK)
        {
            return "Failed to purge RX buffer!";
        }

        setDmxValue(0, 0);   // should always be zero
        setDmxValue(1, 64);
        setDmxValue(2, 64);
        setDmxValue(3, 0);

        Thread thread = new Thread(new ThreadStart(writeDataThread));
        thread.Start();


        return "Ok";

    }
    // init


    public static void setDmxValue(int channel, byte value)
    {
        buffer[channel] = value;
        lpszBuffer="";
        for (int i = 0; i < buffer.Length; ++i)
        {
            lpszBuffer += (char)buffer[i];
        }
    }

    public static void writeDataThread()
    {
        bool done = false;

        int lngBytesWritten=0;

        while (!done)
        {
            FT_SetBreakOn(handle);
            FT_SetBreakOff(handle);
            FT_Write(handle, lpszBuffer, buffer.Length, ref lngBytesWritten);
            System.Threading.Thread.Sleep(50);
        }

    }

}

}

+2

Marshal.Copy

    public static void writeDataThread(int Length)
    {

        int lngBytesWritten = 0;
        IntPtr pnt = Marshal.AllocHGlobal(Length);

        Marshal.Copy(buffer, 0, pnt, Length);
        FT_SetBreakOn(handle);
        FT_SetBreakOff(handle);
        string  StartCode =  null;
        FT_Write(handle, StartCode, 1, ref lngBytesWritten);
        FT_Write(handle, pnt, Length, ref lngBytesWritten);


    }
+1

FTDI ICs have GPIO pins in addition to serial ports. We hope the documentation will tell you if you need to install them. Function FT_SetBitMode. The documentation is here .

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