On 17/02/2023 13:34, Anil Gurses via USRP-users wrote:
Hi all,
I have a simple question about the continuous stream. As you all know,
USRP RX lights indicate whether it's receiving samples or not. On
continuous streaming, these lights are turned on if the recv function
is called from the host computer(stay on until the end of recv
function call). In theory, the continuous streaming mode should
receive and buffer these samples. So, shouldn't the lights be on until
the continuous streaming stop(not until the end of recv function call)?
If this is how it should be, then my understanding of continuous
stream is wrong. If I don't call recv function, doesn't USRP receive
samples and buffer them(on continuous streaming mode)?
The light is turned on when a receive streamer is created, as far as I know.
If your application doesn't call recv(), some number of samples will be
buffered in various parts of the library and OS drivers, and
then they'll just start getting dropped.
In general, your application absolutely, positively, needs to call
recv() to consume samples as fast as they're produced, on average.
Short-term shortfalls are "soaked up" by buffers, but if your
application cannot "keep up", no amount of buffering will save it.
Thanks,
A.
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