Re: [Discuss-gnuradio] byte-wide ADC transfers

[Clark Pope]

In rx_buffer.v I see the 8-bit transfer mode but it only seems to me that it 
allows doubling the number of channels transferred not doubling the rate on 
the two channels? I want to get 16 MHz bandwidth into my PC. I am able to 
run 8 MHz, 16-bit I/Q fine in usrp_fft.py so I figured I should be able to 
do 16 Mhz, 8-bit I/Q since it is the same byte rate over USB but I still 
can't get it to work.

i.e.

  always @*

    if(bitwidth == 5'd8)

      case(store_next)

         4'd1 : begin

            fifodata[7:0] = ch_0[15:8];

            fifodata[15:8] = ch_1[15:8];

         end

         4'd2 : begin

            fifodata[7:0] = ch_2[15:8];

            fifodata[15:8] = ch_3[15:8];

         end

seems to me that selecting 8-bit sends Ch0-3 whereas 16-bit sends Ch0-1?

I still haven't tracked down why the make_format isn't showing up either, 
btw.

Thanks,
Clark


----Original Message Follows----
From: Eric Blossom <address@hidden>
To: Clark Pope <address@hidden>
CC: address@hidden, address@hidden
Subject: Re: [Discuss-gnuradio] byte-wide ADC transfers
Date: Mon, 13 Feb 2006 14:20:35 -0800

On Sun, Feb 12, 2006 at 07:15:19PM -0500, Clark Pope wrote:
> I still have not gotten this to work. I looked in cvs for
> gr-usrp/src/usrp.py and there is nothing in there about setting the 
format?
> I do see it supported in the firmware.

Are you sure that your copy of usrp is up to date?
Please update from CVS (and ensure that it's successful.)
usrp is coming off of source forge which has been *very* flaky recently.

Summary:

  update and build usrp
  update and build gr-usrp
  try again

Eric

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