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Re: [Discuss-gnuradio] Change frequency in USRP source automatically
From: |
Martin Braun |
Subject: |
Re: [Discuss-gnuradio] Change frequency in USRP source automatically |
Date: |
Mon, 14 Mar 2016 17:43:21 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 |
Yan,
simply convert "freq" and your frequency to a PMT before passing into
cons().
Cheers,
Martin
On 03/14/2016 03:44 PM, Yan Huang wrote:
> 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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> This message and any attachment are intended solely for the addressee
> and may contain confidential information. If you have received this
> message in error, please send it back to me, and immediately delete it.
>
> Please do not use, copy or disclose the information contained in this
> message or in any attachment. Any views or opinions expressed by the
> author of this email do not necessarily reflect the views of the
> University of Nottingham.
>
> This message has been checked for viruses but the contents of an
> attachment may still contain software viruses which could damage your
> computer system, you are advised to perform your own checks. Email
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- [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, 2016/03/14
- Re: [Discuss-gnuradio] Change frequency in USRP source automatically,
Martin Braun <=
- 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