Oh, damn.
But, if it enumerates as full-speed do you think it is a counterfeit chip
also?
I will try to run benchmarks, and see speeds.
Is there any way to discern the good and bad chips before buying?
Thanks
On Sun, Oct 21, 2012 at 5:33 AM, Bert Vermeulen <[email protected]> wrote:
> On 20/10/12 23:15, v01d wrote:
> > Hi,
> > I've been working on the Cypress FX2 chip (with the LCsoft board from
> > ebay) and I had a very hard time making it work (mainly, renumerate)
> > using any code that depended on fx2lib.
> > I've finally found some code based on gnuradio which didn't use fx2lib.
> > They developed their own base code and, provided you take some care when
> > compiling their code, it works perfectly.
> > I haven't been able to understand why fx2lib code does not work in the
> > same board.
>
> You should be aware that there's been a rash of counterfeits on the
> LCsoft boards on ebay -- got some bad ones myself. The chips are
> labelled correctly as the Cypress FX2LP, but are actually the older
> Cypress FX2. Among other things, it's a Full Speed-only (12Mb/s) USB
> chip. It also has 8K RAM instead of the FX2LP's 16K. However, fx2lafw
> doesn't run on it.
>
> It's perfectly possible to run code on it, if you don't require HS
> (which fx2lafw does) and don't try to use memory over 8K. Quite likely
> this is the case for the USRP firmware.
>
> So I think you've got a counterfeit.
>
> > I have submitted this issue to the fx2lafw github repo since it is
> > simple to reproduce in my case (I use compiled and precompiled firmware
> > and neither work) but I realize this may be a problem in fx2lib itself.
> > The thing is that the fx2lib code does not seem to be very active and
> > fx2lafw does, so maybe the devs here have more idea.
> > Also, I'm reporting this here in the interest of fixing fx2lib since it
> > looks like a fine library to base code on (I don't know if the gnuradio
> > has a very complete implementation of all FX2 functions).
>
> fx2lafw is a sub-project of sigrok, and this is the correct place to
> report problems for it. That github repo is just a random fork.
>
> fx2lib has some problems compiling with more recent versions of SDCC, so
> we fixed those
> (
> http://sigrok.org/gitweb/?p=sigrok-firmware-fx2lafw.git;a=history;f=fx2lib;hb=HEAD
> )
> and ship fx2lafw with that (stripped-down) version of fx2lib. However,
> we're not the official maintainers of fx2lib, the project does indeed
> appear to be abandoned.
>
>
> --
> Bert Vermeulen
> [email protected]
>
>
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