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 Hello,

 I'm trying to write a Byte to the USB port but I keep getting the error -22 which is:  The operation is invalid given the current state of the device.

 Can someone help me solving this problem because I have no idea how to solve it.

PS: I can read but not write data.

Thanks in advance.

 ...// port setup like in the example

 int ret;

            closeDevice();

            mDevList = UsbGlobals.DeviceList;
            foreach (UsbDevice bus in mDevList)
            {
                if (bus.Info.IdVendor == VENDOR_ID && bus.Info.IdProduct == PRODUCT_ID)
                {
                    mDev = bus;
                    Console.WriteLine("VID" + mDev.Info.IdVendor + " == " + "PID" + mDev.Info.IdProduct);
                    mDev.Open();

                    Debug.Assert(mDev.SetConfiguration(1) == 0);
                    Debug.Assert(mDev.ClaimInterface(0) == 0);

                    mEpReader = mDev.OpenBulkEndpointReader(ReadEndpoints.Ep01);
                    mEpWriter = mDev.OpenBulkEndpointWriter(WriteEndpoints.Ep01);
                    mEpReader.DataReceivedEnabled = false;
                    

                }
            }
        }

.... // Here I try to write

ret = mEpWriter.Write(buf,of,size,1000);

 

 Never mind. I just solved the problem. The EndPoint address was incorrect.

 

Thanks anyway ;)

Hi TimW,

I try, also to use it, have you got a sample or your source code is public and aviable ?

I try , as yu to read/write with endpoint but cant find them in the lib/wrapper.

Thank's by advance 

 Hello,

 You have to select the correct endpoints. I found the correct one by using a little program that gives you all the information you need. The program is called testlibusb-win.exe. After you run the program, connect the device and find the correct endpoint (HEX) for reading and writing.

I have uploaded the program on: http://www.xmit.be/files/x86.zip 

To open a usb port I used the following code.

 

        public void openDevice()
        {

            closeDevice();

            mDevList = UsbGlobals.DeviceList;
            foreach (UsbDevice bus in mDevList)
            {
                // Identification of Device
                if (bus.Info.IdVendor == VENDOR_ID && bus.Info.IdProduct == PRODUCT_ID)
                {
                    mDev = bus;
                    Console.WriteLine("Device: " + mDev.Info.ProductString + " - " + mDev.Info.ManufacturerString);
                    mDev.Open();

                    Debug.Assert(mDev.SetConfiguration(1) == 0);
                    Debug.Assert(mDev.ClaimInterface(0) == 0);

                    mEpReader = mDev.OpenBulkEndpointReader(ReadEndpoints.Ep01); // 	0x81 thanks to program
                    mEpWriter = mDev.OpenBulkEndpointWriter(WriteEndpoints.Ep03);//	0x03
                    mEpReader.DataReceivedEnabled = false;
                }
            }
        }

After opening the device you can read/write data by using the mEpReader.Read()/mEpReader.Write() methods. Choose your input buffer big enough otherwise you also will get an error.

I hope this has helped you.

Ps: The source code will become available on sourceForge as soon as I finish the program.

With Kind Regards, Tim

 Hi timW, thank's

In fact i have finded Ep, (2 and 4 for me) before your post, i write nice, in fact it display the bytes reded, but never read, with the integrated project "testbulk" i have sucefully read, but all the time the same response, delegate doesn't work and strangest thingh is the conect return error .

Is libusbDotNet is the next generation of the Sharplibusb find here ?

One is better or most complete ?

Do you use it under Linux with succes ?

 

Sorry for this lot of question but i'm in the dark and confuse , lol 

 Forget to re read, sorry :

 "In fact i have finded Ep, (2 and 4 for me) before your post, it write nice, in fact it display the bytes readed, but never read,

My code is open source now. You can find it at: http://sourceforge.net/projects/xcom-hp Regards, Tim

Well, i'm confuse, this link is  a tool who use USB transport, you are the author of libusb or libusbdotnet ?

what is the differance with http://sourceforge.net/projects/libusbdotnet/ ?

 

No, I'm not the author of libusbdotnet. The x-com hp program uses the libusbdotnet library. The program xcom-hp implements an xmodem protocol over usb what only available was for the com-port. The program I wrote is a program that enables you to transfer files to/from an hp-calculator. I just posted this link so you can look at my code, how I use the libusbdotnet library under GPL to help anyone who has problems using it. Greetings, Tim

 Hello TimW!

I'm trying used your code how example for develop one aplications with USB, but I haven't had success. I'd like know if the libusbdotnet can to used with others devices USB and how can I find information about endpoints and the paramethers of method UsbDevice.IOControlMessage from libusbdotnet.

Thanks advance.

Hello, http://libusbdotnet.sourceforge.net/ can be very helpfull. Also looking at the examples should help you to get started. If you use the devicenotify demo included when you download libusbdotnet you can use it to detect which endpoint is used with your device. Greetings, TimW