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
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
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
> That's revealing. Are you quite sure that your Atmel device supports
> isochronous endpoints? Which Atmel chip are you using?
uC is Atmel UC3A0512. According to Atmel docs USB controller is Low/Full speed
device capable to do ISO transfer with up to 256 bytes for endpoint
(wizard created INT a
r learning, final application
is SDR radio with 192k/24bit (or higher) rates.
Many USB 2.0 FullSpeed sound cards are capable of 192k/24bit so 12Mb/s is not
bottleneck.
Goran Radivojevic
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this function only expect USB_REQ_TYPE_VENDOR request with altsettings
set to 1.
Goran Radivojevic
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4. set Alt. configuration;
5. send/receive data through endpoints.
Goran Radivojevic
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is your hub for all things parallel software development, from week
results are with composite Vendor+HID device (HID part can be opened
and send/receive data).
Goran Radivojevic
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