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From: | Pan, Luyuan |
Subject: | [Discuss-gnuradio] Question about stream tag |
Date: | Thu, 24 May 2012 22:27:19 +0800 |
User-agent: | Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 |
Hello, I want to use my USRP2 to implement a TDMA system, and I want to send 5 seconds, receive 5 seconds, and do the recycle. I used the stream tag demo in gr-uhd/taguhd. The question is: 1. As sean have said in http://lists.gnu.org/archive/html/discuss-gnuradio/2012-04/msg00506.html we should use "tx_time", "tx_sob" (start-of-burst), and "tx_eob" (end-of-burst) to tag the data flow, but yend B in http://www.ruby-forum.com/topic/3832986 said the data not enclosed by sob-eob tag pair was dropped. Is this problem really exist? And any solution? 2. Is there any way to switch the Tx/Rx? And how to tell the USRP to receive for a desired time slot such as 5 seconds then stop? The only parameter I can see in gr_uhd_usrp_source is 'rx_time'(tells when to start receive), I do not know how to stop the streaming after 5 seconds. Thank you for your help. Any suggestion is appreciated. --
Best regards, Pan, Luyuan |
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