> On 2 May 2019, at 06:15, Hans Petter Selasky <[email protected]> wrote:
> On 2019-05-01 10:34, O'Connor, Daniel wrote:
>> I don't have a solid hypothesis for the failures as yes but one thing I'd
>> like to make sure is that the USB stack is keeping the USB hardware busy
>> with pending requests - does anyone know if the USB FIFO code does that
>> automatically?
>
> Only the XHCI driver supports HW based double buffering of BULK transfers.
Ahh interesting - is that a ECHI hardware limitation or a driver one?
> I suppose you are using BULK. Else you will need to use ISOCHRONOUS transfers.
Yes it's using bulk transfers.
I did consider isochronous transfers when I started this project but I wasn't
sure if there would be enough bandwidth (but perhaps I read the spec wrong). I
imagine there would be enough for this data rate but we have others at higher
speeds (eg 35MB/sec).
Related to bandwidth - are there any statistics gathered about how busy a port
is?
Thanks
--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
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