Re: [Discuss-gnuradio] Multiple simultaneous top blocks?

[Eric Blossom]

On Fri, Feb 15, 2008 at 12:24:41PM -0500, Kshitij Kumar Singh wrote:
> Hi,
> 
>        For an application I needed to import some data into my module
> and then packetize it. The data
> being quite large, comes from a file. My problem is that multiple
> instances of top_block aren't allowed,
> so once I have imported my data, I can't run my program. Even if I nest
> this inside a gr.hier_block2 class,
> I don't know how to create a nestable flow graph so that I run this
> module/class first and then proceed 
> with the execution of the program once I have the data.
> I went through the tx_voice.py example and noticed that all the
> transmit_path.py and pick_bitrate.py do is to provide some necessary
> functions (none of them need to 'run' some module beforehand).
> Is there some way I could get this done using nestable flow graphs, or
> do I end up putting the data in a ten page tuple like random_mask?
> Kindly help. Thanks in advance.

If you're just trying to get the data from a file into a python
string, this will be much much faster:

  data = open('/home/kshitij/work/transmit.dat').read()

No need for all that other stuff...

Eric



> ---------------------------------------------------------------------------------------------------------------------------------
> #testbot.py
> #This module just takes some data from a file and stores it in a
> variable (just a huge string) 
> #which is imported in another module which then transmits it in the form
> of
> # packets. Note that the data to be imported is quite large in size else
> this operation 
> #would have simply been reduced a payload='abcd' string. Thus we import
> the
> #data as:
> #''import testbot
> # testbot.data'' in our module. 
> 
> from gnuradio import gr, packet_utils
> 
> src =
> gr.file_source(gr.sizeof_char,'/home/kshitij/work/transmit.dat',False) 
> sink = gr.vector_sink_b()
> tb = gr.top_block()
> tb.connect(src,sink)
> 
> try:
>     tb.run() 
>     a = sink.data()
>     y=[]
>     for b in a:
>         y.append(str(b)) 
>     data = []    
>     data = ''.join(y)
> except KeyboardInterrupt:
>     pass
> ------------------------------------------------------------------------------------------------------------------------------------------
> 
> Regards,
> Kshitij