On Wed, Mar 02, 2011 at 09:18:39PM -0500, Yan Nie wrote: > Dear all, > > I'm using the message_source to generate the source, connecting it with a > multiply_const block to configure the amplitude for the signal. > > The message_source is created by the following: > data = gr.message_source(sizeof_char, 2)
This means your input items are 1 byte in length (=8 bit). > msgq = data.msgq() > > When the msg is inserted as a tail of the msgq while the flow graph is > running, the msg is inserted using insert_tail(msg). If my understanding > serves me right, if only insert the msg once, it suppose to be send once. In > my case, however, the msg is sent 10 times. (the set_amp is defined in the tb > block to change the amplitude of the signal while tb is running) Could anyone > help me to see what causes the problem? > The code related msgq_insert in main thread is as followed: > try: > while 1: > i = 1 > tb.set_amplitude(5000) > msg_13bit = gr.message_from_string(payload_13bit) Is msg_13bit really only 8 bits large? Have you checked the message sent is what you wanted it do be? > tb._ls.msgq.insert_tail(msg_13bit) > tb.set_amplitude(0) > while(i < 50) > msg_stop = gr.message_from_string(payload_stop) > tb._ls.msgq.insert_tail(msg_stop) Same here. > i += 1 > > Really appreciate any of your help! > Thanks, > Yan > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
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