On 07/19/2012 11:28 AM, Anisha Gorur wrote: > It works now, thanks! It was a combination of a couple dumb errors on my > part. One last thing, I was wondering if there was a way to change the > length of output_items[0]? It is 4096 by default I believe. > Thanks, > Anisha
The item length is basically randomly decided by the scheduler. However, you call set_output_multiple(x) and you will be guaranteed to get x*N items where N is an integer. Also, you dont have to actually fill all items, just fill the number you plan to produce. -josh > > On Thu, Jul 19, 2012 at 2:13 PM, Josh Blum <j...@ettus.com> wrote: > >> >> >> On 07/18/2012 11:32 AM, Anisha Gorur wrote: >>> Hello All, >>> >>> I've been attempting to create my own source block in Python. I have been >>> reading the blocks coding guide here: >>> >> https://github.com/guruofquality/grextras/wiki/Blocks-Coding-Guide#wiki-work-operation-modes >> , >>> but so far my source only outputs zeros. >>> An outline of my code is as follows: >>> >>> class constSource(gr.block): >>> def __init__(self): >>> gr.block.__init__(self, name = "signal source", in_sig = >>> None,out_sig = [numpy.complex64]) >>> >>> def work(self, input_items, output_items): >>> num_output_items = len(output_items[0]) >>> >>> #I put the code to create what I want to stream here, the code >>> creates a numpy.complex64 array with a length of 32. I then return >>> num_output_items >> >> >> You didnt include the code, but I am guessing that you are not assigning >> anything to the output vector? >> >> numpy array assignment look like this >> output_items[0][some kind of index selection] = data >> >> Look closely at how the examples do this >> >> -josh >> >>> return num_output_items >>> >>> I then write my constSource block to a file and I try to see the output >> of >>> the file using a scope sink, but it is just a constant stream of zeros. >> Am >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
