Re: [Discuss-gnuradio] How to finish the rx_callback? in benchmark_ofdm_rx.py

[Lin HUANG]

I'm not very clear with your method3. But what we use is very similar
with this method. When we want to jump out from the callback's block
status, we send a useless pkt to it to make it quit out.

Lin

2010/4/20 Sung Jeen Jang <address@hidden>:
> Hello all
> At first, I appreciate you read my text.
> My problem is that
> how to finish the rx_callback in benchmark_ofdm_rx.py
> I think that the structure of benchmark_ofdm_rx.py is like this.
> make rx_callback and return this to my_top_block
> and return my_top_block to tb
> and tb.start()
> I want to receive the data in 2.5e9 Hz one time.
> and second time receive the data in 2.6e9 Hz.
> So I would like to make this scenario.
> Receiving the data in specific frequency
> and receiving the data in another frequency.
> I tried these method, but failed.
> failed method 1:
> tb = my_top_block(rx_callback, options)
> tb.start()
> tb.wait() #------> process goes into here and cannot escape
> tb.stop()
> failed method 2:
> tb = my_top_block(rx_callback, options)
> tb.start()
> tb.stop() # -----> process broken here
> tb.wait()
> method 3:
> def rx_callback(ok, payload):
>     n=0
>     while n<1000:
>         n += 1
>         (pktno,) = struct.unpack('!H', payload[0:2])
> # ------> after n goes over 1000, process broken
> So, is there good method to this problem?
> In combining sensing & transmit, I succeed like this
> if __name__ == '__main__':
>   tb_wsensing = my_top_block()
>   while 1:
>     tb_wsensing.start()              # start executing flow graph in
> another
>                                                              thread...
>     main_loop(tb_wsensing)
>     tb_wsensing.stop()
>     tb_wsensing.wait()
>     whichfreq=open("minfreq.dat")
>     a=whichfreq.readline()
>     freq_offset=float(a)
>     print a
>     transmit()
> Thank you very very very much for your reading.
>
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