|
From: | Sunny Sam |
Subject: | Re: Transmitting on both channels on USRP X300 |
Date: | Thu, 23 Jan 2020 12:36:47 -0500 |
On 01/22/2020 07:26 PM, Sunny Sam wrote:
> Hi everyone,
>
> I am trying to transmit data from two UDP sockets using the two USRP
> X300 TX lines. I modified the tunnel.py example to do this. The
> modulated signals from the two UDP sockets are connected to the UHD
> USRP Sink block input 0 and 1. What I have noticed is, the work
> function for the USRP Sink block does not get called until there is
> data on both UHD USRP sink input lines. And, it only transmit when it
> receives the same number of data on both input lines at the same time.
> Is there a way to make the USRP Sink block transmit the received data
> on any input line without waiting for data on the other input line?
> I also noticed if I just start the top block, tb.start(), I get a lot
> of late packets (LLLLL). If I start, stop, and start the top block
> again as shown below, I don't get the late packets print. I feel like
> this is related to the USRP Sink block not initializing both input
> lines with the first tb.start() call. Is my assumption correct? Is
> there a better way to do this? Please advise.
>
> tb.start()
> time.sleep(0.25)
> tb.stop()
> time.sleep(0.25)
> tb.start()
>
>
> Thank you in advance.
>
Gnu Radio is fundamentally a *streaming* architecture. So, it naturally
needs all streams to be running at the same time.
There are mechanisms, using tagged-streams to do "burst" transmissions,
but I'm not really an expert on how to make those work.
I'll observe that tunnel.py is, as far as I know, woefully out-of-date
with respect to underlying Gnu Radio mechanisms, etc.
You might be better off starting with a clean sheet of paper, so to speak.
[Prev in Thread] | Current Thread | [Next in Thread] |