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From: | Jared Jensen |
Subject: | RE: [Discuss-gnuradio] Mux settings... |
Date: | Mon, 22 Oct 2007 20:33:09 -0400 |
Thanks. That means I have issues. :) I am trying to use 2 channels, with a mux setting of 0x32103210. I have a DBSRX on RXA and another one on RXB. I have no TX. When I do a... nRead = myDev->read(arr, USB_BUF_SIZE, &bOverrun); I get perfect data from one channel. (i.e. I_a = arr[0], Q_a = arr[1], I_a = arr[4], Q_a = arr[5] and so on.) But I get complete junk on the second channel. (I_a = arr[2], Q_a = arr[3], I_a = arr[6], Q_a = arr[7]). I've swapped the boards (slot A to slot B and vice versa), and they both seem to work fine. I've run usrp_fft.py -R B and -R A and it works in both cases, but I can't find anything to test both at once. But regardless, I don't think it's the USRP's fault. It think it's mine unfortunately. I'm just out of ideas where to look. I've been debugging this for a couple of days now. Ugh. :) Any thoughts? Jared > Date: Mon, 22 Oct 2007 17:15:08 -0700 > From: address@hidden > To: address@hidden > CC: address@hidden > Subject: Re: [Discuss-gnuradio] Mux settings... > > On Mon, Oct 22, 2007 at 05:13:33PM -0400, Jared Jensen wrote: > > > > > What are the proper mux settings for one DBSRX in RXA and one DBSRX > > in RXB? When I used a single DBSRX in RXA 0x00000010 worked well. > > But now I want Channel 0 to be RXA, and Channel 1 to be RXB both of > > which are I and Q, and not swapped. > > > > So far anything other than 0x32103210 or 0x00000010 produces dirty > > output with random-looking noise in the data. > > > > Jared > > If you're using a single channel, usrp.determine_rx_mux_value will get you > the right answer, regardless of the type of daughterboard. > > On the DBSRX, 0x00003210 (or for that matter 0x32103210) will set you > up with side A routed to channel 0 and side B routed to channel 1. > > See http://gnuradio.org/trac/wiki/UsrpRfxDiagrams > and http://gnuradio.org/doc/doxygen/classusrp__standard__rx.html > > Eric > Help yourself to FREE treats served up daily at the Messenger Café. Stop by today! |
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