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

[Mark B. <mb...@ze...>]

You can set an environment variable USB_DEBUG to 1 or 2 for debug 
messages. Also the C header file errno.h may give some clue as to what 
the error numbers mean.

Mark.


Andrew Xiang wrote:

>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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>>    
>>
>
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