> From: wander.lair...@gmail.com
> Date: Mon, 14 Jan 2013 21:37:02 -0200
> To: pyusb-users@lists.sourceforge.net
> Subject: Re: [pyusb-users] Overflow in bulkRead
>
> 2013/1/14 Alan Jhonn Aguiar Schwyn <alan...@hotmail.com>:
> >
> > I found the problem: I try to read 2 bytes, and the device was sending 3..
> >
> > And I test that: if you request 3 (and the device gives 2) no generates any
> > problem.. the size of returned package is 2..
> >
> > Why in the other case yes?
> >
>
> The device USB controller has already built a packet with 3 bytes, if
> you request less than that, the device cannot breaks the package down,
> so it fails.
Yes. When I say "2 bytes" i'm saying: 2 bytes + 3 bytes of header)In my code:
dev.read(READ_HEADER_SIZE + lenght)
>If you are not sure about how many bytes you should
> receive, it is often better to try to read "a packet size" bytes.
Ever read 3 bytes? And check if there are 3 or only 2?
> --
> Best Regards,
> Wander Lairson Costa
>
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