I meant, enumerates as high-speed, sorry.
On Sun, Oct 21, 2012 at 11:52 AM, v01d <[email protected]> wrote:
> 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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>
>
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