Dear all,
I'm using message_source generate data source then modulated and transmitting through USRP1 board with LFTX plugged-in. After building the flow graph, I used the msgq_insert to insert 1950 bytes data into the flow graph to be transmitted, then insert another group of data which is 97500 bytes into the the flow graph. The result turns out these two group of data are repeatly sent 10 times. What could be the problem here?
This problem really troubles me for a while and it seems to be the biggest problem that I really need to solve for my project, and I dug into the source code related to message_source and gr_message, but couldn't get any clue why this happens here. Really need your help!
Really appreciate any of you help!
Thanks,
Yan
the code related:
#message_source in tb block
indata = gr.message_source(gr.sizeof_char, 1950)
msgq = indata.msgq()
constellation = [-1,1]
mapper = chunks_to_symbols_bf(constellation)
#setup USRP and signal amplitude setting......
usink = ...
connect(indata,mapper,usink)
#flowgraph running in main
try:
tb.start()
while 1:
i = 0
tb.set_amp(5000)
msg_13bit = gr.messge_from_string(payload_13bit) #payload_13bit is 1950 bytes
tb.msgq.insert_tail(msg_13bit)
tb.set_amp(0)
while (i<50)
msg_stop = gr.message_from_string(payload_stop) #payload_stop is 1950 bytes
tb.msgq.inset_tail(msg_stop)
i +=1
tb.wait()
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