[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] USRP2 and MIMO

From: Arun Pillai
Subject: Re: [Discuss-gnuradio] USRP2 and MIMO
Date: Wed, 22 Dec 2010 19:56:34 -0500
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20101207 Thunderbird/3.1.7

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?


reply via email to

[Prev in Thread] Current Thread [Next in Thread]