Re: Async bulk transfer question

Greetings,

Your hardware needs to send a ZLP packet to the host when it is 
complete.  If there is no real "end" to the data (IE a stream) then it 
needs to send ZLPs in scenarios where the last transfer size is equal to 
the endpoint max packet size.

Alternatively, you can pass a buffer into the usb read API that is equal 
to the maximum packet size but this is less efficient.

Regards,
Travis

On 7/24/2014 8:52 AM, nicolasgagnon wrote:
> Hi all,
>
> I am currently using the async API to transfer bulk data.
>
> My problem is that I don`t know the size of the data that i`ll be receiving.
> Thus the last portion of my data is never sent because the buffer is never
> full (requested size is never matched).
>
> I am wondering if there is a way to retrieve the data contained in the
> buffer when the request hits the timeout, like the synchronous bulk read
> does.
>
> Thanks for the help.
>
> Nicolas
>
>
>
> --
> View this message in context: http://libusb.6.n5.nabble.com/Async-bulk-transfer-question-tp5713466.html
> Sent from the LibUSB Dev - Win32 mailing list archive at Nabble.com.
>
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