Re: [Discuss-gnuradio] looping with work() function

[Martin Braun]

On 03/11/2014 06:10 AM, Sumedha Goyal wrote:
> Hello
> 
> I am executing a flowgraph where I pass different parameters to the
> work() function of my block in every iteration.

I'm not sure I'm understanding you correctly, but this is not how you
use GNU Radio blocks.

Have a look at gr-digital/examples/berawgn.py. Is this what you want to do?

> 1. I would like my flowgraph to execute once with a certain set of
> parameters and on satisfying a certain condition, it should stop
> execution (even if the queue/buffer of the block is not empty). 
> 2. The control should come back to the main() function and the next
> iteration should start with a new set of parameters and again upon
> satisfying a certain condition the flowgraph should exit.

You shut down a flow graph by returning WORK_DONE (or -1) from the work
function.

M

> 
> *The work() function is of the block "test_demo":*
> *############new_test_tx.py#################*
> class test_demo(gras.Block):
>  def__init__(self,parameters):
> gras.Block.__init__(self,name="test",
> in_sig = [numpy.uint8,numpy.uint8,numpy.uint8],
>             out_sig = [numpy.uint8,numpy.uint8])
> 
> def work(self, ins, outs):
> --some process here
> 
> *The top_block is as following and has code for all the connections(not
> shown here):*
> 
> class top_block(grc_wxgui.top_block_gui):
> 
> def __init__(self,options,llr):
> grc_wxgui.top_block_gui.__init__(self, title="Top Block")
> _icon_path = "/usr/share/icons/hicolor/32x32/apps/gnuradio-grc.png"
> self.SetIcon(wx.Icon(_icon_path, wx.BITMAP_TYPE_ANY))
> 
>           self.=new_test_tx.test_demo(options.parameters)
> def main():
> 
> parser = OptionParser(option_class=eng_option, conflict_handler="resolve")
> parser.add_option("", "--args",default="",
>                  help="set the address of usrp_device [default='']")
>         (options, args) = parser.parse_args ()
> # build the graph
> tb=top_block(options,param)
>         tb.Run(True)
> if __name__=="__main__":
> main()
> 
> I am able to execute the flowgraph once and then the main() function exits.
> I would like to perform this action for some 1000 iterations. It is a
> kind of for loop that I use during C/Python programming. How can I use
> it with GNURadio and Python.
> 
> 
> Thanks and Regards,
> Sumedha
> 
> 
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