Re: [Discuss-gnuradio] gain slider issues

[Eric Hill Matlis]

Oh, and what is this line for:

        self.gain_control.set_k(10**(self.gain/10))

I commented it out and didn't notice any change in behavior...

By the way- have you had issues with cpuspeed?  Normally on my system the 
processor is clocked down from 2.2 GHz to 1 GHz.  I have another gnuradio 
application which does not cause cpuspeed to ramp up the cpu clock when I 
run the script.  However, if I call a second script simultaneously to tie 
up the cpu, then the processor ramps up, and BOTH scripts go faster.  I 
have an Athlon64 X2 processor running Fedora Core 5.  It seems to me that 
if a given process could run faster at a higher clock speed, then the 
system should be smart enough to clock the cpu faster.

thanks,

eric

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