On Mon, May 19, 2014 at 2:46 PM, zielalaoui <z.i.elala...@gmail.com> wrote:
> Hi All, > I'm trying to built a system with several digital modulations. First, I > should be able to print constellations by using qt constellation block. I > started by creating a simple flowgraph with two modulations. That is my > flowgraph <http://gnuradio.4.n7.nabble.com/file/n48338/qt_applic.jpeg> . > I take the top_block.py file and I tried to modify it by adding new > function > to switch the null sink and the constellation block by using disconnect() > and connect() function. finally in the main function i added lock() and > unlock() functions to reconfigure the application. > the problem is when i run the modified python file the constellation > graphic > appear but it conserves the first constellation representation even the > switching is happened . > what do you think about that? > should I write something to rerun the qt application? > I appreciate your help > Yes, the QT sinks keep some internal buffers, which are preserved during a lock/unlock reset event. You could look to overload the start() function (add a bool cosnt_sink_c_impl::start() function) that calls just calls _reset() and returns block::start(). In the extreme, you could cal memset on all d_residbufs_real and d_residbufs_imag to rest them to 0, but I think just calling _reset and having the pointers appropriately update should be enough. Tom
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