An update, not a resolution....
I've been experimenting with the FPGA code that I posted last week and
cannot get the resulting bitstream to work with OpenBTS on a 52 MHz
USRP. I know for sure that it worked in July or so of last year with
a 64 MHz USRP, so I'll convert my USRP back to 64 MHz and do some
On Thu, Mar 25, 2010 at 11:37 AM, Rad <rad@...> wrote:
> I've tried using your code that you posted to the GNURadio Wiki yesterday. I
> can generate the rbf so that I get exactly the same file as the one that is
> in your zip file (having changed the project files slightly to remove the
> e:\ paths) but unfortunately it does not work with OpenBTS. During
> compilation, there were many warnings and complaints about timings not being
> met. The code looks to be a slightly modified version of the current
> "usrp_inband_usb" project (several files have "_usb" in their name) which
> implies to me that this is not the older, "lost" code, although having not
> seen it I can't be sure. Did you post the correct zip file?
> File details:
> Original: "std_inband.rbf" - length 176507 bytes - md5sum
> Yours: "usrp_inband_usb.rbf" - length 171637 bytes - md5sum
>> After you compile the project, you'll
>> end up with a bitstream file-- usrp_inband_usb.rbf. You need to
>> rename this file std_inband.rbf and copy it to the ./Transceiver and
>> ./Transceiver52M subdirectories of OpenBTS.
> By the way, the "Tranceiver" directories are not where the "rbf" files are
> loaded from on my system when running OpenBTS. They live in
> "/usr/local/share/usrp/rev4", but as you say, you'll need to move or link to
> the newly created file in order to try it out.
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