Re: [Discuss-gnuradio] gain slider issues

[Eric Hill Matlis]

Thanks Chuck!

That works nicely.  Much appreciated.

eric

************************************
Eric H. Matlis, Ph.D.
Aerospace & Mechanical Engineering Dept.
120 Hessert Center for Aerospace Research
University of Notre Dame
Notre Dame, IN 46556-5684
Phone: (574) 631-6054
Fax:   (574) 631-8355

On Thu, 26 Oct 2006, Charles Swiger wrote:

> On Thu, 2006-10-26 at 16:00 -0400, Eric Hill Matlis wrote:
> > I'm having some python coding issues with a slider I'm trying to
> > implement.  The code is based on usrp_wfm_rcv_pll.py, which uses the
> > powermate to adjust either frequency or volume.  I would like to replace
> > the volume slider with a gain slider, which exists in the original but
> > which is not controlled by the powermate.
> >
> > My code is below, and the symptoms are that while the new gain slider
> > moves, the value shown does not update until I click the powermate button
> > to switch to frequency control.  Any suggestions?
>
> Hi Eric - All you need is to put an "update_status_bar()" in the
> knob rotate handler. Change this:
>
> >      def on_rotate (self, event):
> >          self.rot += event.delta
> >          if (self.state == "FREQ"):
> >              if self.rot >= 3:
> >                  self.set_freq(self.freq + .001e6)
> >                  self.rot -= 3
> >              elif self.rot <=-3:
> >                  self.set_freq(self.freq - .001e6)
> >                  self.rot += 3
> >          else:
> >              step = self.subdev.gain_range()[2]
> >              if self.rot >= 3:
> >                  self.set_gain(self.gain + step)
> >                  self.rot -= 3
> >              elif self.rot <=-3:
> >                  self.set_gain(self.gain - step)
> >                  self.rot += 3
>
> To this:
>
>    def on_rotate (self, event):
>        self.rot += event.delta
>        if (self.state == "FREQ"):
>            if self.rot >= 3:
>                self.set_freq(self.freq + .001e6)
>                self.rot -= 3
>            elif self.rot <=-3:
>                self.set_freq(self.freq - .001e6)
>                self.rot += 3
>        else:
>            step = self.subdev.gain_range()[2]
>            if self.rot >= 3:
>                self.set_gain(self.gain + step)
>                self.rot -= 3
>            elif self.rot <=-3:
>                self.set_gain(self.gain - step)
>                self.rot += 3
>            self.update_status_bar ()
>
>
>
> Then it works, and will update the gain displayed in the status bar on
> every call to on_rotate() when gain is being adjusted.
>
>
> --Chuck