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Re: [Discuss-gnuradio] Change frequency in USRP source automatically
From: |
Yan Huang |
Subject: |
Re: [Discuss-gnuradio] Change frequency in USRP source automatically |
Date: |
Mon, 14 Mar 2016 22:44:41 +0000 |
Hi Martin,
Thank you for your kind reply. But I'm still comfused that I already have to
input in pmt::cons(“freq”,2.4e9), cause in the manual it said:
pmt::cons(KEY, VALUE): This format is useful for commands that take a single
value. Think of KEY and VALUE as the argument name and value, respectively. For
the case of the QT GUI Frequency Sink, KEY would be "freq" and VALUE would be
the new center frequency in Hz.
Could you please give me an exmaple about it?
Thank you a lot,
Yan
________________________________________
From: address@hidden address@hidden on behalf of Martin Braun address@hidden
Sent: 14 March 2016 17:18
To: address@hidden
Subject: Re: [Discuss-gnuradio] Change frequency in USRP source automatically
Yan,
check the PMT manuals. cons() takes 2 PMTs as input.
Cheers,
Martin
On 03/14/2016 09:09 AM, Yan Huang wrote:
> Hi all,
>
>
>
> I want to change the frequency in “USRP source” automatically, for
> example 2.37GHz-2.43GHz with each time stepping 2MHz.
>
>
>
> 1. As you know, the USRP source has an input message port, so I want to
> connect it to a “Message strobe” to control the frequency change. But
> after I see [1][2], I write PMT type commands in “Message PMT” in
> “Message Strobe” as:
>
> pmt::cons(“freq”,2.4e9)
>
> it comes up error “invalid syntax(<string>,line 1)”, so I don’t know how
> to further stepping the frequency.
>
> 2. If I use the “Message Strobe” to define frequency, what can I put in
> the “frequency” in “USRP source” block? Put it as 0?
>
>
>
> [1] https://gnuradio.org/doc/doxygen/page_uhd.html#uhd_command_syntax
>
> [2]
> https://gnuradio.org/doc/doxygen/page_msg_passing.html#msg_passing_commands
>
>
>
> Many thanks ,
>
>
>
> Yan
>
>
>
>
>
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permitted by UK legislation.
- [Discuss-gnuradio] Change frequency in USRP source automatically, Yan Huang, 2016/03/14
- Re: [Discuss-gnuradio] Change frequency in USRP source automatically, Martin Braun, 2016/03/14
- Re: [Discuss-gnuradio] Change frequency in USRP source automatically,
Yan Huang <=
- Re: [Discuss-gnuradio] Change frequency in USRP source automatically, Martin Braun, 2016/03/14
- Re: [Discuss-gnuradio] Change frequency in USRP source automatically, Yan Huang, 2016/03/15
- Re: [Discuss-gnuradio] Change frequency in USRP source automatically, Timothée COCAULT, 2016/03/15
- Re: [Discuss-gnuradio] Change frequency in USRP source automatically, Yan Huang, 2016/03/15
- Re: [Discuss-gnuradio] Change frequency in USRP source automatically, Timothée COCAULT, 2016/03/15
- Re: [Discuss-gnuradio] Change frequency in USRP source automatically, Yan Huang, 2016/03/15
- Re: [Discuss-gnuradio] Change frequency in USRP source automatically, Timothée COCAULT, 2016/03/15
- Re: [Discuss-gnuradio] Change frequency in USRP source automatically, Yan Huang, 2016/03/16