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

From: Josh Blum
Subject: Re: [Discuss-gnuradio] Transmitting additional data from N210 to the PC
Date: Tue, 13 Sep 2011 22:04:07 -0400
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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.


> 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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