> Anyone done this yet?
> I want to explore this as a first step in a high frequency, high data-rate
> capturing oscilloscope for PC.
> Using USB2.0 I would get a superb datarate and more than enough power to
> drive any chip for ADC.
>
> Accuracy isn't my goal, as in the previous oscilloscope project from
> piclist.com, I'm after visualizing data.
> To be able to view a pulse-train and debug communication based on that
will
> be sooo much easier than other means...  And, most USB2.0 chips are, as
far
> as I know USB1.1 compliant too.  Thus older comps can do captures at lower
> data-rates instead, meaning either bursts at full temporal-resolution or
> continous at lower temporal-resolution.  Would be sooo great to have a
> single or dual channel oscilloscope you just cram in your pocket :-)

I don't see the scope to host bandwidth as that much of a big deal.  Your
capture bandwidth is what counts.  You will have to capture to RAM anyway,
so uploading the data to the host can wait a few milliseconds.  You only
need to send to the host what you can look at.  A decent trace would be 1024
points by 10 bits.  Even packed into 16 bits this is only 2Kbytes.  In
reality, I'd rather have a fast 8 bits than slower 10 bits.  Either way,
upload traces doesn't sound like a bottleneck.


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