discuss-gnuradio
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] Swept FFT


From: Josh Blum
Subject: Re: [Discuss-gnuradio] Swept FFT
Date: Sun, 02 May 2010 12:54:42 -0700
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9pre) Gecko/20100217 Shredder/3.0.3pre

The type in variable sink needs to match the type output by the triangle source (probably you want float). Anyway, grc will not validate the flow graph if the types does not match.

The variable sink sets a variable in python which will be a python float (not be confused with a float in c/c++ which is strictly 4 bytes wide). The real type on the fft sink or usrp source means that it will accept a python float or a python int.

Basically, grc will handle the type checking with the variable sink. And python is smart enough to do the right thing with the value.
So as long as your flow graph passes validation, it should just work.

-Josh

On 05/02/2010 12:11 PM, William Pretty Security Inc wrote:
Ok. So I followed Josh's advice and fed the output of a triangle source into
a variable sink.

My problem is getting the variable sink to control the usrp source.



The variable sink can be of type: Complex, Float, Int, short, or byte.

The usrp source is looking for a variable type Real and so is the FFT Sink.



So I'm not sure what to do from here ??





_______________________________________________
Discuss-gnuradio mailing list
address@hidden
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio




reply via email to

[Prev in Thread] Current Thread [Next in Thread]