Hi All,
I have a Touch Screen Device connected to a USB Device.As part
of my driver loading process I want to send a command to the device and
receive the response sent by it.My Device has only one end point
(Interrupt).
When I see the IOStatus block,I see STATUS_DEVICE_DATA_ERROR
returned from the device.
The part of code I am using to build the IRP,URB and passing it down
is below .
UCHAR InitBufferWrite[3] =
{0x44,0x49,0x0d};//Ascii Commands in Hex to be sent to the device
UCHAR InitBufferRead[8] ;//Data to be read
from the dvice
Irp = IoBuildDeviceIoControlRequest(
IOCTL_INTERNAL_USB_SUBMIT_URB,
deviceExtension->TopOfStackDeviceObject,
(PVOID) &InitBufferRead,
8,//Length of read buffer
(PVOID) &InitBufferWrite,
3, //Length of write buffer
TRUE, //InternalDeviceControl
NULL,
NULL);
PURB urb = NULL;
urb = BULKUSB_ExAllocatePool(NonPagedPool, siz);
urb->UrbControlVendorClassRequest.Hdr.Length = (USHORT)
sizeof(struct _URB_CONTROL_VENDOR_OR_CLASS_REQUEST);
urb->UrbControlVendorClassRequest.Hdr.Function =
URB_FUNCTION_VENDOR_DEVICE ;
urb->UrbControlVendorClassRequest.TransferFlags = 0;
urb->UrbControlVendorClassRequest.TransferFlags |=
USBD_SHORT_TRANSFER_OK;
urb->UrbControlVendorClassRequest.TransferBuffer =
(PVOID)&InitBufferWrite;
urb->UrbControlVendorClassRequest.TransferBufferLength =
3;
urb->UrbBulkOrInterruptTransfer.UrbLink = NULL;
urb->UrbBulkOrInterruptTransfer.TransferBufferMDL =
NULL;
urb->UrbBulkOrInterruptTransfer.TransferBufferLength =
length;
nextStack = IoGetNextIrpStackLocation(Irp);
nextStack->Parameters.Others.Argument1 = urb;
nextStack->MajorFunction = IRP_MJ_INTERNAL_DEVICE_CONTROL;
nextStack->Parameters.DeviceIoControl.IoControlCode =
IOCTL_INTERNAL_USB_SUBMIT_URB;
ntStatus = IoCallDriver(DeviceExtension->TopOfStackDeviceObject, Irp );
When I look in the Completion routine I see the Status returned by the
USB stack is STATUS_DEVICE_DATA_ERROR.And one more thing is If you notice at
the top while building the IRP I have given an input buffer to receive the
data sent by the device.Even this is 0 as i notice in the completion
routine.
The command which I am sending to the device as Vendor specific commands.
Do I need to build another URB to read the data from the device ???
Can anybody let me know what is going wrong in the above code ?
Cheers,
Sai Prasad
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