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

[Andrew X. <xi...@gr...>]

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.

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.

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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