Re: [Discuss-gnuradio] Clock rate change on x300

[Derek Kozel]

With the X300/X310 the clock rate must be specified, as show by Marcus,
in the Device Address field. The X300 cannot change clockrrdate after it
is configured, the B2x0, E3x0, and N310 can.

Regards,
Derek

On 07/08/2019 15:51, Marcus Müller wrote:
> You can!
>
> If you're using GRC to design your GNU Radio system, it's the "Clock
> Rate" property of the UHD USRP Source / Sink blocks; if you're directly
> coding, you want to call set_clock_rate() before doing anything else,
> or supplying "master_clock_rate=184.32e6" with your device address.
>
> Best regards,
> Marcus
>
> On Wed, 2019-08-07 at 14:30 +0000, Mitchell, Paul wrote:
>> Oh I see.  Does that mean that I can use GNU Radio to change it?  If
>> not, I’ll ask the USRP guys as you suggested.
>>  
>>  
>> Paul Mitchell
>> Engineering Technician IV
>> address@hidden
>> 256.716.9056 (Work)
>> 256.289.3581 (Cell)
>>  
>> From: Marcus Müller
>> Sent: Wednesday, August 7, 2019 9:27 AM
>> To: Mitchell, Paul; Derek Kozel; address@hidden
>> Cc: usrp-users
>> Subject: Re: [Discuss-gnuradio] Clock rate change on x300
>>  
>> Dear Paul,
>>
>> I'd recommend taking this to the USRP-users mailing list (in CC),
>> since
>> it's not really GNU Radio-related.
>>
>> Since that clock rate setting doesn't really "exist" until the device
>> is operating, you can't query that from any program than the program
>> currently using the USRP (but that program would know, anyway,
>> because
>> it either set the master clock rate to 184.32 MHz or it left it at
>> 200
>> MHz).
>>
>> Best regards,
>> Marcus
>>
>> On Wed, 2019-08-07 at 14:18 +0000, Mitchell, Paul wrote:
>>> I’m fine using one of the supported rates.  That’s totally fine.  I
>>> would just like to know how to check the clock rate and swap
>> between
>>> the two for experimentation purposes.  Is there a terminal string I
>>> can run in Linux to do this?
>>>  
>>>  
>>> Paul Mitchell
>>> Engineering Technician IV
>>> address@hidden
>>> 256.716.9056 (Work)
>>> 256.289.3581 (Cell)
>>>  
>>> From: Derek Kozel
>>> Sent: Tuesday, August 6, 2019 1:56 PM
>>> To: address@hidden
>>> Subject: Re: [Discuss-gnuradio] Clock rate change on x300
>>>  
>>> Hi Paul,
>>>
>>> What rate do you want to adjust it to and for what purpose? The
>> X300
>>> supports a master clock rate of 200 MS/s and 184.32 MS/s. The built
>>> in
>>> DSP can convert to an integer divisor sample rate of one of those
>>> two.
>>> Adding support for another rate would require either a lot of
>>> software
>>> work or implementing a rational resampler in the FPGA in which case
>>> you
>>> would need a Vivado license.
>>>
>>> https://files.ettus.com/manual/page_usrp_x3x0.html
>>>
>>> Regards,
>>> Derek
>>>
>>> On 06/08/2019 19:09, Mitchell, Paul wrote:
>>>> I need to adjust the clock rate on a USRP x300. Is there a simple
>>> way to do this or do I need to use Vivado to access the FPGA image
>>> somehow? I am using Linux for everything. 
>>>> Paul Mitchell
>>>> Engineering Technician IV
>>>> address@hidden
>>>> 256.716.9056 (Work)
>>>> 256.289.3581 (Cell)
>>>> _______________________________________________
>>>> Discuss-gnuradio mailing list
>>>> address@hidden
>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>
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