Re: [Discuss-gnuradio] Scheduling a block even with no input items RE: Flow graph blocking when doing 2x1 transmission

[David Halls]

Hi,

Thank you for those links. Unfortunately the rates for the two ports are not an exact ratio, so I am not sure how this will work. Also I have

ninput_items_required[0] = noutput_items;
ninput_items_required[1] = 0;

I am not quite sure how to change this... Maybe it will help to show more clearly what I am doing.

Attached is a flow graph that shows how I have managed to achieve what I want - but clearly it is a real fudge.

I am doing a 2x1 transmission, so in time-domain (TD), I have [ Header 1 (240 samples), Header 2 (240 samples), superimposed Payload Tx1 + Tx2 (1280 samples) ] then this repeats.

Header TD Tx1, Header TD Tx2 and Payload TD Tx1 always have items available, *but* Payload TD Tx2 has no items at time=0.

I would like the header data (both Tx1 and Tx2 to always be transmitted, so that even when Payload TD Tx2 is not available, the protocol/frame structure does not break down.

Regards,

David
________________________________________
From: Activecat address@hidden
Sent: 04 June 2014 10:51
To: address@hidden
Cc: David Halls
Subject: Re: [Discuss-gnuradio] Scheduling a block even with no input items RE: Flow graph blocking when doing 2x1 transmission

On Wed, Jun 4, 2014 at 4:59 PM, David Halls <address@hidden<mailto:address@hidden>> wrote:
Hi!

This shouldn't be the case. But is there any easy way to allow different rates on the two streams, so I could produce more zeros on stream 1 than items on stream 0? Or vice versa?

David


Please stay on the list.

To have different rates on different inputs,
[1]  http://lists.gnu.org/archive/html/discuss-gnuradio/2014-05/msg00166.html
[2]  http://gnuradio.4.n7.nabble.com/set-relative-rate-td46167.html

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