On Tue, 2008-06-03 at 07:45 +0800, Xiaofan Chen wrote:
> On Tue, Jun 3, 2008 at 4:10 AM, Herbert Graf <hgraf@email.com> wrote:
> > I've been looking into USB2 solutions. I need to create a high speed USB
> > device that'll connect to a linux box.
> >
> > I've been looking into the options have have decided to try out the
> > Cypress EZ-USB FX2 parts.
> >
> > I was wondering if anyone here has any experience with developing for
> > those parts?
> 
> I do not have experiences with this part but it seems to be one
> of the most popular device for Linux USB developers.

That is good to hear.

> There are many examples for EZ-USB FX2 on the internet.

Ahh, didn't realize there was such a "following", I thought it more of a
niche product.

> > In the end I'll only need to have one isochronous EP.
> Any reason why you want to use isochronous transfer? It is
> the most difficult type and you do not need to use it unless
> for video/audio.

Hehehe, bingo! Video at first, multiple streams of video eventually.

> >
> > Also, anybody have any pointers for writing a USB driver for Linux? I've
> > got some resources but wouldn't mind fielding some recommendations.
> 
> Two options.
> 1) user mode driver using libusb/openusb. The old libusb-0.1.x does not
> support isochronous transfer but the new libusb-1.0 and openusb
> both support isochronous transfer.

Any idea if they can "keep up" with high speed USB? I need at minimum
10MBps to start, more to follow.

> 
> A few libusb examples I am familiar with:
> http://forum.microchip.com/tm.aspx?m=106426
> http://forum.microchip.com/tm.aspx?m=340892
> 
> libusb-1.0
> http://libusb.wiki.sourceforge.net/Libusb1.0
> 
> openusb
> http://openusb.wiki.sourceforge.net/
> 
> openusb and isochronous transfer example
> http://dev4usb.netbeans.org/source/browse/dev4usb/samples/webeye/

Thanks again for the pointers.

TTYL
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