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[Discuss-gnuradio] Using PPS as a sampling trigger

From: rmsrms1987
Subject: [Discuss-gnuradio] Using PPS as a sampling trigger
Date: Mon, 13 Feb 2012 08:21:06 -0800 (PST)

Hello Everyone, 

I am a relatively new user to the USRP2 and currently would like to make
some changes to how an external PPS signal is deciphered.  As of now, I
believe that once the first rising edge of a PPS signal is detected, the
USRP2 will continually collect data until it is programmed to stop.  What I
am hoping to do is collect data when the PPS sends a rising edge and pause
the data collection when a falling edge is detected.  Basically the external
PPS signal is going to act as a TR switch.  So far I have been looking
through the rx_timed_samples.cpp and the header file clock_config.hpp
programs to plan out my approach.  The problem where I am getting stuck is
telling the USRP to pause data collection on a falling edge.  I have not
found any function in the libraries that is able to do this.  Has anybody
been able to program the PPS input to act as a TR switch or have any ideas
about how to about this? Any information on this would be greatly

Thank you very much, 
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