Re: [Discuss-gnuradio] Fft scope frequent hangs

[Jonathan Jacky]

On Fri, 17 Nov 2006, Matteo Campanella wrote:

> fft scope ... frequently hangs on my fc5
> The scope freezes (in all modes) and it needs to be killed to get the 
control back.

> Has anyone experienced the same?

A GNU Radio flowgraph can generate samples much faster than wxPython can 
display them.   In fft_sink, fft_rate is the number of frames fft_sink 
attempts to draw per second.  Try adjusting it down.  There is a similar 
parameter frame_decim in scope_sink, again adjust this down until the 
display updates and the program works.

Also, if the flowgraph data rate 
is not limited by some hardware device (like audio or the USRP), you 
need to put a gr.throttle block in the flow graph to limit it.

Jon Jacky