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Re: [Discuss-gnuradio] Synchronization issue with multiple USRPs

From: Josh Blum
Subject: Re: [Discuss-gnuradio] Synchronization issue with multiple USRPs
Date: Tue, 26 Apr 2011 10:23:49 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110223 Lightning/1.0b2 Thunderbird/3.1.8

On 04/26/2011 09:36 AM, Khalid Jamil wrote:
> The GRC file is attached. Here i am showing it scope sink with six
> channels.

The trouble is that you need to synchronize the time across all N
devices, and tell them to start streaming at a specified time.

So, if you want to synchronize N devices in GRC, every device needs to
all go into the same "uhd usrp" block; and specify the "sync unknown
pps" and "external reference" options.

Outside of GRC, if you wanted to use multiple device handles, you can
accomplish this by catching the pps edge and calling set_time_next_pps
for each handle.


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