Re: [Discuss-gnuradio] USRP2 and MIMO

[Arun Pillai]

On 12/22/2010 5:33 PM, Matt Ettus wrote:
> On 12/22/2010 02:21 PM, Arun Pillai wrote:
> > I have questions about using MIMO on USRP2, and also debugging FPGA code
> > on USRP2. I am not using UHD.
> >
> > 1. Connecting 2 USRPs with the MIMO cable:
> >
> > I am looking at the code for the mimo_tx firmware and do not see how
> > control packets, say, setting frequency, interpolation, gain etc. are
> > sent to the slave. The mimo_app_common_v2.c handle_control_chan_frame
> > function seems to drop these packets right after handling them. The
> > example code in usrp2/host/apps/test_mimo_tx.cc does not seem to do
> > anything special either to deal with this, in fact, the code to set any
> > board specific parameters is commented out. The mimo_tx_slave still has
> > the handle_control_chan frame code in app_common_v2.c which it uses (not
> > mimo_app_common). Does that mean the slave USRP also needs to be
> > connected via ethernet, and one needs to get a handle via the
> > usrp2::make interface separately to the master and slave to set control
> > parameters (although the example code in usrp2/host/apps/test_mimo_tx
> > does not do that)?
>
>
> Those apps are old and should be deleted.  To see how the MIMO cable 
> is handled you will need to get the packet_router branch from the UHD 
> repository.

Thank you. Do I need to use ISE 12 to build this FPGA code? Is there a 
particular minor revision number that I need to use in 12?

Arun