Hi:

     please help!  I wrote a USBLIB.dll file useing CYUSB.dll with C#. there is a trouble in running XferData method of CyUSBEndPoint. The erro information is "shut down safe handle"(i translated it from chinese, i don't know if it's correct). Please see my code below:

       public CUSB()         //class consductor function work normally
        {
            usbDeviceList = new USBDeviceList(CyConst.DEVICES_CYUSB);
            iDeviceCount = usbDeviceList.Count;
            if (iDeviceCount != 0)
            {
                for (int i = 0; i < iDeviceCount; i++)
                {
                    myDevice[i] = usbDeviceList[i] as CyFX2Device;
                }
            }
        }

       public ErrFlag InitialDevice(int devcie, string fwFile)   //this function work normally
        {
            if(!myDevice[devcie].LoadRAM(fwFile))
            {
                return ErrFlag.ErrInit;
            }
            return ErrFlag.NoErr;
        }

       public ErrFlag GPIOCTRL(int device,byte PortSel, byte PinSel, bool HighLow)
        {
            byte[] DataBuf = new byte[4];
            int Len = 4;
            DataBuf[0] = 0x00;                                        //command code
            DataBuf[1] = PortSel;                                    
            DataBuf[2] = PinSel;
            if (HighLow)
                DataBuf[3] = 0x01;
            else
                DataBuf[3] = 0x00;
            
            if (!myDevice[device].InterruptOutEndPt.XferData(ref DataBuf, ref Len))                    //erro in here
                return ErrFlag.ErrIntOut;
            if (Len < 4)
                return ErrFlag.ErrIntOut;          

            return ErrFlag.NoErr;
        }

       can you give me some advise?

additional, i found some times, in my CyUSBDevice instance, except control endpoint, all the others are null. please see my screenshort i attachment jpg file.

My instantiation is:

usbDeviceList = new USBDeviceList(CyConst.DEVICES_CYUSB);
            iDeviceCount = usbDeviceList.Count;
            if (iDeviceCount != 0)
            {
                for (int i = 0; i < iDeviceCount; i++)
                {
                    myDevice[i] = usbDeviceList[i] as CyUSBDevice;
                }
            } 

 Hi,

From the screenshot, I could see that the device handle being shown is for the default FX2LP device (i.e. VID/PID = 0X04B4/ 0x8613). Please download the appropriate application firmware, if not downlaoded and test. Or if the screenshot is taken at the wrong the, please upload the right one. Also check if  handle to Interrupt OUT EP is null just before calling "InterruptOutEndPt.XferData". If so you would be getting NULL reference found exception.

Regards,

Gayathri

Hi Gayathri:

      Thanks for your reply,  i'm using a cy68013a chip, so the FX2LP device and screenshot is ok. My application firmware what i download to cy68013a's RAM is working well in my VC++6.0 application. So my problem is why it doesn't work with my C# application? And also i don't know why the all the EP are null but control endpoint?