I noticed some cross-talk when doing SPI captures, too...but found that
proper grounding of everything involved got rid of the issue.

As Luis said, grab the demo software...and I also believe that Intronix have
a 30-day money back guarantee. They nice people to deal with, so I can't
imagine them not honouring that guarantee.

-marc



On 6/11/07, luis antonio prata barbosa <luispratalistas@gmail.com> wrote:
>
> Hi Josh,
>
> Let me give you my opinion:
>
> The memory of logicport (intronix) is of 2k points, but compressed. Only
> changes are stored.
> Considering about 20 transitions in clk, data and cs signals this 2k
> points
> can store aprox. 100 SPI commands. Its a fantastic advantage for a low
> cost
> equipment. You can analyze seconds of information limited only* by this
> transitions.
>
> Problem: Not too serious, but problem.
> The crosstalk is very high. The cables are not shielded and ground is only
> one pin for 8 data signals.
> You learn to indentify valid signals transition and crosstalk readings,
> when
> they happen, and its not a serious problem for SPI debbung in most common
> applications.
>
> Other problem is that SPI analysis is done only by software. You CAN'T use
> the SPI readings as tringger. For example, you can't trigger the system
> when
> a SPI value was receveid. But others trigger possibility make this problem
> smaller.
>
> Have you donwloaded the demo code from intronix yet? Try the software.
>
> That's all.
>
> Luis.
>
> 2007/6/11, Josh Koffman <joshybear@gmail.com>:
> >
> > On 6/11/07, Chris Emerson <pic@nosreme.org> wrote:
> > > I found the memory a problem when trying to analyse some serial comms,
> > > but connecting a PC serial port instead/as well would have solved
> that.
> > >
> > > My main complaint with it is the fact that it has a USB A recepticle
> (ie
> > > the USB socket you'd get on a PC) on the device, and comes with an
> > > "illegal" A to A cable!
> >
> > Hi Chris,
> >
> > Can you describe the situation that the memory became a problem in?
> > Was it high baud rates or trying to capture a really long stream? Or
> > perhaps something else? As for the cable, that is annoying but I
> > suppose I can make do with an illegal cable.
> >
> > Josh
> > --
> > A common mistake that people make when trying to design something
> > completely foolproof is to underestimate the ingenuity of complete
> > fools.
> >        -Douglas Adams
> > --
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