Re: [sigrok-devel] fx2 not enumerating

[Bert V. <be...@bi...>]

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
be...@bi...