Re: [Libusb-win32-devel] win-libusb async read

[Stephan M. <ste...@we...>]

> Where do  I find out the file that keep a list of error like -5? And how can
> I enable the usberror output? I guess I have to have the DDK to recompile
> it? I don't have  the DDK installed.

You can use usb_set_debug(255) to enable debug output. You don't have to 
recompile anything. 
Also, get DebugView from http://www.sysinternals.com/Utilities/DebugView.html
This tool allows you to monitor the kernel driver's and the DLL's debug output.

> 
> I cannot use multiple of 64, because there is the only way to detect end of
> the packet. Each block is 64bytes, if the block is not 64 blocks, that means
> it is the last block. This is the only way in the device I am using. Maybe I
> am missing something.

If you are using a multiple of 64 you can still detect the last packet. The
usb_bulk_read() function returns the number of bytes read. If you request
64*21 bytes and your device only sends 64*20+11 bytes then 64*20+11
will be returned.

> 
> I think I might have some hardware noise problem. Because I did not see  the
> problem on another hardware.
> 
> 
> -Andrew
> 
> 
> ----- Original Message ----- 
> From: "Stephan Meyer" <ste...@we...>
> To: <lib...@li...>; "Andrew Xiang"
> <xi...@gr...>
> Sent: Wednesday, June 21, 2006 3:49 PM
> Subject: Re: [Libusb-win32-devel] win-libusb async read
> 
> 
> >
> > > #define BUF_SIZE (64*20+11)
> >
> > Can you always guarantee that the last packet your device
> > sends is 11 bytes or less? If not, then set  BUF_SIZE to a multiple
> > of the endpoint's buffer size. Otherwise your device might produce
> > 'data overrun' errors (this may cause the -5 error you got).
> >
> > >  while(end_thread==0)
> > >  {
> > >  usb_bulk_setup_async(dev, &context0, EP_IN);
> > >    usb_submit_async(context0, tmp1, sizeof(tmp1));
> > >  bytesread=usb_reap_async(context0, INFINITE);
> > >  printf("%d bytes read back\n", bytesread);
> > >  }
> >
> > You forgot to free 'context', call usb_free_async().
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