Really appreciate your reply, Martin. The msg that I need to send is 3315 byte long, which is the length of msg_13bit and of msg_stop as well. I changed the msg_limit of message_source to 6630, but this didn't changed the result. I expect to send msg_13bit once and msg_stop 50 times, but what I got is 10 times msg_13bit and 500 times msg_stop. I really wondering what the problem here, I only called the msgq_insert() function once, why it sends the msg 10 times? What could be a good solution to this problem?
How to decide the parameter, msg_limit, as it said this parameter represents the maximum number of the msg in msgq. I expected to send this msg_13bit as one msg and it takes time for the flow graph to really pop the msg to transmit, which explains why I set msg_limit as 2. Is my understanding wrong? How to set this parameter? How can I solve this over msg sending problem? Really appreciate your help! Yan On 03/03/11, Martin Braun <martin.br...@kit.edu> wrote: > > 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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