unsafe void GetDevDescriptor()
{
int len = 56; // total size of buffer
byte[] buffer = new byte[len];
bool bRetVal;
fixed (byte* buf = buffer)
{
SINGLE_TRANSFER* transfer = (SINGLE_TRANSFER*)buf;
transfer->SetupPacket.bmRequest = CyConst.TGT_DEVICE | CyConst.REQ_STD | CyConst.DIR_FROM_DEVICE;
transfer->SetupPacket.bRequest = CyConst.USB_REQUEST_GET_DESCRIPTOR;
transfer->SetupPacket.wValue = CyConst.USB_DEVICE_DESCRIPTOR_TYPE << 8;
transfer->SetupPacket.wLength = 18; // size of the USB_DEVICE_DESCRIPTOR part
transfer->SetupPacket.dwTimeOut = 5;
transfer->BufferOffset = 38; // size of the SINGLE_TRANSFER part
transfer->BufferLength = 18;
fixed (byte* lpInBuffer = buffer)
{
fixed (byte* lpOutBuffer = buffer)
{
fixed (int* lpBytesXfered = _bytesXfered)
{
bRetVal = PInvoke.DeviceIoControl(_hDevice, CyConst.IOCTL_ADAPT_SEND_EP0_CONTROL_TRANSFER,
(IntPtr)lpInBuffer, len, (IntPtr)lpOutBuffer, len, (IntPtr)lpBytesXfered, (IntPtr)null);
}
}
}
_usbdStatus = transfer->UsbdStatus;
_ntStatus = transfer->NtStatus;
if (bRetVal)
{
USB_DEVICE_DESCRIPTOR* descriptor = (USB_DEVICE_DESCRIPTOR*)(buf + 38);
_usbDeviceDescriptor = *descriptor;
_bcdUSB = descriptor->bcdUSB;
_vendorID = descriptor->idVendor;
_productID = descriptor->idProduct;
_devClass = descriptor->bDeviceClass;
_devSubClass = descriptor->bDeviceSubClass;
_devProtocol = descriptor->bDeviceProtocol;
if ((_bcdUSB & CyConst.bcdUSBJJMask) == CyConst.USB20MajorVer)
_maxPacketSize = descriptor->bMaxPacketSize0;
else
_maxPacketSize = (int)(1 << descriptor->bMaxPacketSize0);
_bcdDevice = descriptor->bcdDevice;
_configs = descriptor->bNumConfigurations;
}
}
}
public void GetDeviceDescriptor(ref USB_DEVICE_DESCRIPTOR descr)
{
if (_alreadyDisposed) throw new ObjectDisposedException("");
descr = _usbDeviceDescriptor;
}
