Re: [Discuss-gnuradio] Transmitting additional data from N210 to the PC

[Eral Tuerkyilmaz]

Hello,

I tried to change the FPGA design using the new (N2x0 rev3) as template 
by simply letting the strobe and sample output of the dsp_core_rx1 open 
and assigning them to fixed values:

----- (file: u2plus_core.v) ------------
dsp_core_rx #(.BASE(SR_RX_DSP1)) dsp_core_rx1 
(.clk(dsp_clk),.rst(dsp_rst),.set_stb(set_stb_dsp),.set_addr(set_addr_dsp),.set_data(set_data_dsp),
.adc_i(adc_i),.adc_ovf_i(adc_ovf_a),.adc_q(adc_q),.adc_ovf_q(adc_ovf_b),.sample( 
), .run(run_rx1_d1), .strobe( ), .debug() );	


assign sample_rx1 = 32'hDEAD_BEEF;
assign strobe_rx1 = 1;
----

But it looks like this is taking hours (~2hrs) to compile the FPGA 
design (especially Place and Route is taking really long). (I'm using 
xilinx ise 13.1)
When I used the original design (with strobe_rx1 and sample_rx1 attached 
to the dsp_core_rx1) it compiled much much faster.


After I finally got the output bin file I burned it into the SPI flash 
and the device booted fine. Then in GRC I tried to attach both channels 
to a File Sink using the USRP subdev specification you suggested me 
(thank you for that). It looks like nothing is coming out of both 
channels the sink output filesize remains zero bytes.

Is there maybe anything i have overlooked when I was changing the FPGA 
design?

Best Regards,
Eral


On 14/09/2011 04:04, Josh Blum wrote:
> On 09/13/2011 07:48 AM, Eral Tuerkyilmaz wrote:
> > Hello,
> >
> > Thanks for your suggestion. I tried to replace the second DSP Core by a
> > simple counter so that i should receive something on the second channel.
> >
> > Then instatiated a UHD source block in GRC, added a second channel (Num
> > Channels = 2) to the UHD Source block and configured it the same way as
> > the other channel. Then I tried to run the graph but it keeps telling me
> > that the configuration of the the second channel is wrong (e.g:
> > uhd_usrp_source_0.set_center_freq(10000000, 1) leads to
> > vector::_M_range_check ... Maybe I'm just using wrong parameters for the
> > second channel?)
>
> Yea, it needs a subdev spec to map the wbx frontend to DSP0 and DSP1,
> try "A:0 A:0" for the string representation.
>
> -josh
>
> > By the way: I'm using a WBX board to get the I/Q Samples. Are there
> > maybe any other parameters for the USRP board necessary (subdev specs?)
> > to get this additional samples?
> >
> > Thank you,
> > Eral
> >
> > On 05/09/2011 09:55, Josh Blum wrote:
> >
> > > You may want to replace the second DSP in the top level verilog with
> > > your own module. On the host side, just configure the uhd source block
> > > for two channels.
> >
> >
> > > On 09/04/2011 11:18 PM, Eral Tuerkyilmaz wrote:
> > > > Hi,
> > > >
> > > > I want to change my USRP N210 - FPGA config to calculate a correlation
> > > > sum and transmit this sum synchronously with the I/Q sample pairs to the
> > > > PC (e.g to get this samples from an extra channel on the UHD block).
> > > > What would be the easiest way to transmit these additional data to the
> > > > samples and where are changes necessary (firmware, fpga-config)?
> >
> >
> >
> >
> > _______________________________________________
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>
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