On Tue, Sep 01, 2009 at 03:58:32PM -0700, Eric Blossom wrote: > On Tue, Sep 01, 2009 at 06:23:24PM -0400, Tom Rondeau wrote: > > I have an application where I have to start and stop the USRP2 > > multiple times at various points, but I've been having trouble getting > > it to work. I traced it down to see that when the stop control message > > is sent, the host never processes the reply pack from the USRP2. Using > > Wireshark, I can see that this packet is being sent. After the failure > > of the stop command, the remaining commands to restart the USRP2 and > > set its parameters fail. > > > > To make this easier to debug, I found out that the simple program > > below exercises the problem nicely. To see the failures, I just print > > out the success message from "usrp2::impl::stop_rx_streaming" and from > > "usrp2::impl::start_rx_streaming" (in /usrp2/host/lib/usrp2_impl.cc). > > This is what happens: > > > > usrp2::stop_rx_streaming: success=1 > > usrp2::start_rx_streaming: success=1 > > usrp2::stop_rx_streaming: success=0 > > usrp2::start_rx_streaming: success=0 > > usrp2::stop_rx_streaming: success=0 > > > > The first stop_rx_streaming comes during the initialization of the > > USRP2 to make sure its not streaming yet. > > > > Strangely (or maybe not; I can think of a some good reasons for this > > behavior), when you set the "rate" variable to above 300 to slow down > > the transmissions, everything works fine. At rate=200 it's flaky; > > sometimes it works and sometimes it doesn't. So there seems to be some > > timing issue involved. > > > > I've been looking and feel like I'm getting close to an answer, but it > > keeps escaping me. Any ideas on what's causing this? >
It's fixed! I ran your test case 500 times w/o failure. There was a race in the code that notified the caller when the reply came in. I also used your "don't enqueue when trying to stop" idea too. Please pull from http://gnuradio.org/git/eb.git u2-hang Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
