On Thu, 16 Jan 2014, Tim Roberts wrote:
> > This is where things getting complicated. Interrupt or Bulk transfers
> > scheduling
> > are not time guarantied and 1mS period between two packets is sometime
> > bigger resulting
> > in very bad synchronization (verified with oscilloscope).
>
> No,
GORAN RADIVOJEVIC wrote:
> Sorry, my error: buffer size is 4096, packet size is 256. If I'm
> correctly calculating: 125uS*12packets*256byte will give me 1.5MB/s transfer
> rate
> (3072bytes in 2mS period).
The number of packets per request is not part of the bandwidth
computation. If you need 1
Tim Roberts wrote: >You can't have 4096-byte packets in
>high speed. You can have 3072 (1024-byte packets with 3 transfers per
>microframe), which gives you 24MB/s.
Sorry, my error: buffer size is 4096, packet size is 256. If I'm
correctly calculating: 125uS*12packets*256byte will give me 1.5MB/s
GORAN RADIVOJEVIC wrote:
> Interval is 1 and I think something is wrong in calculation routine.
> I did more tests and result is ~1.5MB/s for 3072 packet size (~2MB/s
> for 4096).
I'm confused by this statement. You can't have 4096-byte packets in
high speed. You can have 3072 (1024-byte packets
Tim Roberts wrote:
>What is the interval set to in your endpoint descriptor? If you were
>only getting one interval per frame, that's exactly what you'd expect. >If you
>have an interval of 1, then you should be getting 2 MB/s.
Interval is 1 and I think something is wrong in calculation routine
GORAN RADIVOJEVIC wrote:
>
> I'm trying to do ISO OUT transfer on Windows 7 64 bit and every
> callback returns LIBUSB_TRANSFER_ERROR.
> On Linux transfer is LIBUSB_TRANSFER_COMPLETED, I can read data from
> my USB device (Atmel UC3A3256) but
> performance is around 300KB/s for 256 ISO endpoint si
Hi to all,
I'm trying to do ISO OUT transfer on Windows 7 64 bit and every callback
returns LIBUSB_TRANSFER_ERROR.
On Linux transfer is LIBUSB_TRANSFER_COMPLETED, I can read data from my USB
device (Atmel UC3A3256) but
performance is around 300KB/s for 256 ISO endpoint size.
Bulk and Interrupt t
