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Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver)
From: |
Douglas Geiger |
Subject: |
Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver) |
Date: |
Thu, 19 Feb 2009 16:32:15 -0600 |
User-agent: |
Thunderbird 2.0.0.19 (Windows/20081209) |
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Matt Ettus wrote:
>>
>> Ah - that's was the problem. Unfortunately my scope can only handle a
>> single channel at 100MHz, so setting the divisor >2 helps.
>> Unfortunately it appears the clock is not synchronized with my external
>> 10MHz clock - any suggestions on further steps to debug why I'm having
>> trouble?
>
>
> I don't understand this. It works 100% of the time here. What code are
> you using?
>
> Matt
I'm at svn revision 10441 - with both the firmware and fpga code built
from that (using Xilinx ISE 10.1 to make the fpga). I've just modified
the txrx.c code - adding:
clocks_enable_test_clk(true, 2);
clocks_mimo_config(MC_WE_LOCK_TO_SMA);
just before the while(1) loop
My rx_mimo.cc code also calls ->config_mimo(MC_WE_LOCK_TO_SMA), but
right now I've stepped back to just getting one USRP2 synchronized to my
external source - which in this case is a function generator with a
10MHz sine with 2V P-P.
Is it possible some of the hardware on my USRP2's isn't working?
Thanks,
Doug
- --
Doug Geiger
Research Assistant
Communications and Signal Processing Lab
Oklahoma State University
http://cspl.okstate.edu
address@hidden
address@hidden
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- Re: [Discuss-gnuradio] Re: Re: USRP2 and external clock (from GPS receiver), (continued)
- Re: [Discuss-gnuradio] Re: Re: USRP2 and external clock (from GPS receiver), Matt Ettus, 2009/02/19
- Re: [Discuss-gnuradio] Re: Re: USRP2 and external clock (from GPS receiver), Johnathan Corgan, 2009/02/19
- [Discuss-gnuradio] Re: Re: Re: USRP2 and external clock (from GPS receiver), Changkyu Seol, 2009/02/19
- [Discuss-gnuradio] Re: Re: Re: USRP2 and external clock (from GPS receiver), Changkyu Seol, 2009/02/20
- [Discuss-gnuradio] Re: Re: Re: USRP2 and external clock (from GPS receiver), Changkyu Seol, 2009/02/20
- Re: [Discuss-gnuradio] Re: Re: Re: USRP2 and external clock (from GPS receiver), Eric Blossom, 2009/02/20
Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Douglas Geiger, 2009/02/19
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Matt Ettus, 2009/02/19
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Douglas Geiger, 2009/02/19
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Matt Ettus, 2009/02/19
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver),
Douglas Geiger <=
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Matt Ettus, 2009/02/19
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Douglas Geiger, 2009/02/20
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Matt Ettus, 2009/02/20
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Douglas Geiger, 2009/02/20
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Douglas Geiger, 2009/02/20
- Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver), Eric Blossom, 2009/02/20