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Re: [Discuss-gnuradio] UHD example on USRP1 - Buffering

From: Josh Blum
Subject: Re: [Discuss-gnuradio] UHD example on USRP1 - Buffering
Date: Wed, 16 Feb 2011 10:15:08 -0800
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20101208 Lightning/1.0b2 Thunderbird/3.1.7

On 02/16/2011 02:50 AM, Sivaramakrishnan B C wrote:
> Hi All,
> I was wondering if there is any buffering happening on the host and/or on
> the USRP (USRP1 and N210) when the UHD send() and recv() methods are called?

Yes of course. There are buffers in the host and device (fifos).


> Thanks,
> Shiva
> On Thu, Feb 3, 2011 at 10:40 AM, Josh Blum <address@hidden> wrote:
>>> 1. What is the parameter --spb, samples per buffer. And generally, what
>> is
>>> this buffer?
>> This is the buffer that the application fills with samples, and passes
>> into the call device->send()
>>> 2. What is the relationship between spb (sample per buffer), duration
>>> (number of seconds to transmit) and rate (rate of outgoing samples) and
>>> wave-freq (waveform frequency in Hz)?
>> Samples per buffer is independent of these other variables. Indirectly,
>> it controls how often the call to send() occurs. The option is there to
>> allow users to experiment with various buffer sizes.
>> -josh
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