Hi,

I'm trying to make a bulk transfer using the IOCTL Interface of the cyusb.sys driver with Delphi, but the DeviceIOControl Function always returns 87 (ERROR_INVALID_PARAMETER).

I'm using the following Code :

procedure NonEP0TransferOut(handle:THandle;endPointAddress:Byte; pBuffer:PBuffer; bufferSize:Word);
const cBufSize = 512;
var
    singleTransfer:SINGLE_TRANSFER;
  buffer : array[0..cBufSize+SizeOf(SINGLE_TRANSFER)-1] of Byte;
  i : Integer;
  dwBytes: DWORD;
begin
    ZeroMemory(@singleTransfer, SizeOf(SINGLE_TRANSFER));

  SingleTransfer.SetupPacket.ulTimeOut := 1000;
  singleTransfer.ucEndpointAddress := endPointAddress;
  singleTransfer.IsoPacketLength := 0;
  singleTransfer.BufferOffset := SizeOf(SINGLE_TRANSFER);
  singleTransfer.BufferLength := bufferSize;
  dwBytes := 0;

    Move(SingleTransfer,Buffer,SizeOf(SINGLE_TRANSFER));

  for i := 0 to bufferSize-1 do begin
      buffer[i+SizeOf(TSingleTransfernEP0)] := pBuffer^[i]; // buffer direkt hinter den SINGLE_TRANFER record schreiben
  end;

  if not DeviceIoControl(    handle,IOCTL_ADAPT_SEND_NON_EP0_TRANSFER,
                          @buffer, bufferSize+SizeOf(SINGLE_TRANSFER),
                          @buffer, bufferSize+SizeOf(SINGLE_TRANSFER),
                          dwBytes,nil) then
      raise ECyUSBException.Create('Error #17 during nonEP0 control Transfer : ' + IntToStr(getLastError()));
end;

The SINGLE_TRANSFER structure seems to be correct. It works fine for EP0 Transfers. I also tried IOCTL_ADAPT_SEND_NON_EP0_DIRECT, which gives the same error. Can someone tell me what I'm doing wrong ?

regards

Simon Koops

I have the solution now, i used pipe address instead of descriptor address. now it works

 Glad to hear that the problem is solved now, and good that you shared it here.

Regards,

Gayathri