I accidentally posted this in usrp-users instead of discuss-gnuradio, so I'm reposting here.
Sean ________________________________ From: [email protected] [[email protected]] on behalf of Nowlan, Sean [[email protected]] Sent: Friday, December 02, 2011 11:32 PM To: [email protected] Subject: Re: [USRP-users] set_start_time problem Josh, I think I've got it working. I haven't checked with a spectrum analyzer or an oscilloscope; I just watched for the transmit LED to come on. I've included the fix below; I'm not sure if you need to make a similar change on the RX side of things, i.e., in gr_uhd_usrp_source.cc. --- jblum/gr-uhd/lib/gr_uhd_usrp_sink.cc 2011-12-02 10:29:50.801978304 -0500 +++ gnuradio/gr-uhd/lib/gr_uhd_usrp_sink.cc 2011-12-02 23:24:54.203518213 -0500 @@ -389,7 +389,7 @@ _metadata.start_of_burst = true; _metadata.end_of_burst = false; - _metadata.has_time_spec = _stream_now; + _metadata.has_time_spec = !(_stream_now); if (_start_time_set){ _start_time_set = false; //cleared for next run _metadata.time_spec = _start_time; Sean ________________________________ From: [email protected] [[email protected]] on behalf of Nowlan, Sean [[email protected]] Sent: Friday, December 02, 2011 7:54 PM To: [email protected] Subject: [USRP-users] set_start_time problem Hi everyone, especially Josh :) I'm having a problem using the set_start_time function in gr-uhd. My flowgraph begins transmitting immediately even though I've specified a time in the future. Any ideas? Example flowgraph: class test(gr.top_block): def __init__(self): gr.top_block.__init__(self, "test") ... self.usrp = uhd.usrp_sink( device_addr="addr=192.168.10.2", io_type=uhd.io_type.COMPLEX_FLOAT32, num_channels=1) ... self.usrp.set_time_source("external",0) self.usrp.set_clock_source("external",0) ... t = self.usrp.get_time_now(0).get_real_secs() + 20.0 self.usrp.set_start_time(uhd.time_spec_t(t)) ... if __name__ = '__main__': ... tb = test() ... tb.start() raw_input('press enter to quit: ') tb.stop()
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