I have a vey similar issue in sending packets using FTW ofdm, in which I tried sending only one packet but observe much more packets in file sink. I have not figured out if it is because of msgq() or something else in lower layer
Best, Guanbo On Mar 3, 2011, at 7:03 PM, Yan Nie <yn...@uwo.ca> wrote: > Dear all, > > I'm using gr.message_source as the signal source and using multiply_const_ff > to set the amplitude of the signal then feeding the signal into USRP1 with > LFTX plugged-in. The message need to be transmitted in my project is 3315 > bytes. After the flow graph starting to run, msgq.insert_tail() is utilized > to insert the message into the flow graph. The amplitude changes every time > after the message is transmitted. I only called insert_tail() once in every > cycle of transmission to feed the message and expect the message to be sent > once, but the result turns out the times of the message transmission is > ranging from once to 10 times, which means sometimes the message is only > transmitted once, sometimes it continuously repeated 10 times. What's the > problem would be? What decide the parameter, msgq_limit, which is the maximum > number of message in the message queue? Can I send this 3315 bytes data as > one message and set the msgq_limit as 1? > > Really appreciate any of your suggestion! > > Thanks, > Yan > > The code related to message insert > try: > while 1: > tb.set_amplitude(2000) > msg_13bit = gr.message_from_string(payload_13bit) > tb._ls.msgq.insert_tail(msg_13bit) > tb.set_amplitude(0) > msg_stop = gr.message_from_string(payload_stop) > tb._ls.msgq.insert_tail(msg_stop) > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
