Re: [USRP-users] Passing Messages as Commands to UHD Sink

[Sarah Tran via USRP-users]

Hi Martin,

Thank you for verifying my code I was able to put in debugging printf 
statements, and was able to figure out what was wrong (although I couldn't get 
the GR logging statements like debug to show). The message was indeed getting 
to the UHD sink, but I realized that I needed to also specify the parameter for 
lo_offset otherwise the key 'freq' just sets the lo_offset to 0. I was using 
Bastian's gr-ieee802-11 library, and I didn't realize the way that he tunes his 
center freq is different than just uhd.tune_request(target_freq, lo_offset). He 
actually uses uhd.tune_request(target_freq, rf_freq=freq-lo_offset, 
rf_freq_policy = uhd.tune_request.POLICY_MANUAL). So I modified the code like 
below:

::uhd::tune_request_t request;
request.target_freq = freq;
request.rf_freq_policy = ::uhd::tune_request_t::POLICY_MANUAL;
request.rf_freq = rx_freq - lo_offset;
new_tune_reqest = ::uhd::tune_request_t(request);
.
.
_update_curr_tune_req(new_tune_reqest, chan);

That did the trick. Thank you for your help.

-Sarah


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Today's Topics:

   1. Re: UHD Converter for X310 series with unsupported data
  format (Kei Nguyen)
   2. Re: Help on UHD Python API installation (Zhongyuan Zhao)
   3. Re: Help on UHD Python API installation (Zhongyuan Zhao)
   4. Using both sides of an NI USRP-2953R (da...@daryllee.com)
   5. Re: UHD Converter for X310 series with unsupported data
  format (Martin Braun)
   6. Re: Help on UHD Python API installation (Martin Braun)
   7. Re: Using both sides of an NI USRP-2953R (Martin Braun)
   8. Re: 2 B210 synchronous problem (Martin Braun)
   9. Re: USRP with different GPSDO (Martin Braun)
  10. Re: Passing Messages as Commands to UHD Sink (Martin Braun)
  11. Re: use 2 DDC chain of N210 with SBX (Martin Braun)
  12. Re: transmit underrun in dual 10Gige X310 config (Martin Braun)
  13. Re: [RFNoC] uhd_usrp_probe fails and throws uhd::lookup_error
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  14. Re: [RFNoC] uhd_usrp_probe fails and throws uhd::lookup_error
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  15. [UHD] Dependency changes: MSVC and Vivado (Martin Braun)
  16. Re: [RFNoC] uhd_usrp_probe fails and throws uhd::lookup_error
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  17. Re: [RFNoC] uhd_usrp_probe fails and throws uhd::lookup_error
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  18. [UHD] Changes to uhd_images_downloader (Martin Braun)
  19. uhd error with new version (Dang tien Vo-Huu)
  20. Re: 2 B210 synchronous problem (Piotr Krysik)
  21. Re: [RFNoC] uhd_usrp_probe fails and throws uhd::lookup_error
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  22. Re: use 2 DDC chain of N210 with SBX (omid saeedy)
  23. Re: [RFNoC] uhd_usrp_probe fails and throws uhd::lookup_error
  (Adam Kurisko)


--

Message: 1
Date: Tue, 23 Jan 2018 12:13:48 -0500
From: Kei Nguyen 
To: usrp-users@lists.ettus.com
Subject: Re: [USRP-users] UHD Converter for X310 series with
unsupported data format
Message-ID:

Re: [USRP-users] Passing Messages as Commands to UHD Sink

[Martin Braun via USRP-users]

On Tue, Jan 23, 2018 at 02:11:21AM +, Sarah Tran via USRP-users wrote:
>Hi All,
> 
>I would like to change the center freq of my UHD Sink depending on who the
>receiver is. So I wrote a custom block that will read what the destination
>mac address is for a packet, and send a message to change the center freq
>based on what destination address it is. This is the format for how I
>write the message:
> 
>{
>   message_port_register_out(PDU_PORT_ID);
>}
>   command = pmt::make_dict();
>   command = pmt::dict_add(command, pmt::mp(“freq”),
>pmt::mp(2.412e9));
>   command = pmt::dict_add(command, pmt::mp(“chan”),
>pmt::mp(0));
>   message_port_pub(PDU_PORT_ID, command);
> 
>I saw from other mailing list posts, that this was the syntax they used,
>but I can’t get it to actually the center frequency. Is there something I
>am doing wrong? I am using uhd version 3.10 and GRC version 3.7.11.1.

Sarah,

this looks fine. Are you sure the messages are being received? Do you
see any log statements to that effect?

-- Martin


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