Hi,

Im trying to change the drivers for our USB Devices (CY7C68013A) from EzUSB.sys to CyUSB.sys. I'm using Delphi 5, so I use the IOCTL Interface. Is there some more information about the IOCTL Interface than in CyUSB.pdf ?

Is it still possbile to use the IOCTL Ezusb Commands ?

How can I get a device Descriptor ?

I tried IOCTL_GET_DEVICE_DESCRIPTOR, but i always receive Error 87 (The parameter is incorrect.)  (with GetLastError() )

I also tried IOCTL_Ezusb_GET_DEVICE_DESCRIPTOR, with the same result.

Several simple IOCTL_ADAPT commands do work, so the handle seems to be correct and the driver installed properly.

Can someone give me a hint please ?

regards

Please post the part of code you're using to invoke get descriptor I would like to take a look at it to see which parameter is wrong.

Regards,

Anand

Hi,

I try to get the device descriptor with the following code :

procedure GetDeviceDescriptor(handle:THandle; var devDescr:DEVICE_DESCRIPTOR);

var

dwBytes : DWORD;

ds : DEVICE_DESCRIPTOR;

begin

if not DeviceIoControl(handle, IOCTL_GET_DEVICE_DESCRIPTOR,

@ds, sizeof(DEVICE_DESCRIPTOR),

@ds, sizeof(DEVICE_DESCRIPTOR),

dwBytes, nil) then

raise ECyUSBException.Create('Error #14 : ' + inttostr(GetLastError()));

devDescr := ds;

end;

IOCTL_GET_DEVICE_DESCRIPTOR is defined as followed (from usbscan.h):

IOCTL_GET_DEVICE_DESCRIPTOR   := CTL_CODE(FILE_DEVICE_USB_SCAN, IOCTL_INDEX + 6, METHOD_BUFFERED,FILE_ANY_ACCESS);

FILE_DEVICE_USB_SCAN =$8000;
IOCTL_INDEX = $0800;

declariation of  the type DEVICE_DESCRIPTOR (from usbscan.h)

type

_DEVICE_DESCRIPTOR = packed record
    usVendorId: USHORT;
    usProductId: USHORT;
    usBcdDevice: USHORT;
    usLanguageId: USHORT;
  end {_DEVICE_DESCRIPTOR};
  DEVICE_DESCRIPTOR = _DEVICE_DESCRIPTOR;
  PDEVICE_DESCRIPTOR = ^_DEVICE_DESCRIPTOR;