Hey Martin, Good to hear from you as always. Gnuradio scheduling baffles me more than anything else on this planet. The day I get my head around it will be a happy day indeed. :0
The problem with using 'sob', 'eob' is because I have two inputs to the USRP UHD sink. One is constantly transmitting and has items coming in from time=0, but the other has no input items from time=0, they only arrive later on. As a result the sink seems to block waiting for items on *both* inputs before it will transmit anything. I don't want the USRP to have to wait for the second stream to be populated before it transmits anything... I thought 'forecast' may help me out, but wasn't sure what to put in the function to make it schedule even when there are no input items? David -----Original Message----- From: Martin Braun [mailto:martin.br...@ettus.com] Sent: 03 June 2014 14:53 To: David Halls; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Scheduling a block even with no input items RE: Flow graph blocking when doing 2x1 transmission On 06/03/2014 03:30 PM, David Halls wrote: > Dear All, > > Had anyone tried to implementing a gnuradio block that will output > zeros if there are no items at the input, and will simply copy the > input to output otherwise? > > I find that if there are no items at the input, the block never gets > scheduled. > > I want this block to feed zeros to my USRP until actual data is ready > to be passed to it. Hey David, any reason you can't use eob/sob? Also, did you set forecast accordingly? Note that this can go wrong easily: If this blocks produces a bajillion zeros very quickly, nothing will happen until the USRP has consumed them all. M ________________________________ NOTE: The information in this email and any attachments may be confidential and/or legally privileged. This message may be read, copied and used only by the intended recipient. If you are not the intended recipient, please destroy this message, delete any copies held on your system and notify the sender immediately. Toshiba Research Europe Limited, registered in England and Wales (2519556). Registered Office 208 Cambridge Science Park, Milton Road, Cambridge CB4 0GZ, England. Web: www.toshiba.eu/research/trl --------------------------------------------------------------------------------------- This email has been scanned for email related threats and delivered safely by Mimecast. For more information please visit http://www.mimecast.com ---------------------------------------------------------------------------------------
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