[En-Nut-Discussion] Problem connecting analog sound on port F

[Vincent Timmerman]

I tried it out with a disabled JTAG fuse, and it works. There is still much
noise on my audio, but at least i hear it. I'll check the noise reduction
first to see if there's room for improvement.

Thanks for the tip!

Vincent

On Wed, Mar 12, 2008 at 11:46 AM, Vincent Timmerman <
vincenttimmerman at gmail.com> wrote:

> It works to disable the JTAG interface by setting the JTD bit (
> sbi(JTAG_REG, JTD); ), but how do I change these other 2 bits (OCDEN and
> M103C). What register they are in? I read in the topic "U R G E N T !!!
> Ethernut 1 -using PORTF" that it's not safe to change the fuse bits. It's
> safer to change the values in the program. So how can I do that?
>
>
>
>
> On Tue, Mar 11, 2008 at 1:07 PM, jakub nowak <jdnowak at gmail.com> wrote:
>
> > Please read topic from last week: "U R G E N T !!! Ethernut 1 -using
> > PORTF".
> > First check Your fuse bits, if you have new atmega the JTAG is on, so
> > you can't use half of PORTF.If You want to use this port in100%, You
> > have to change three fuse bits JTAG,OCDEN and M103C. All of them
> > should be not programmed =1(not programmed in fuse bits =1 programmed
> > =0).
> > I hope this will help You.
> > JDN
> >
> > 2008/3/11, Vincent Timmerman <vincenttimmerman at gmail.com>:
> > > Hi,
> > >
> > >  I want to connect an analog signal to my Ethernut 1.3H board. When I
> > do, the
> > >  analog signal turns into noise. When not connected, it's a good
> > signal.
> > >  The board I want to connect to my Ethernut, is a standard mic-amp
> > circuit (
> > >  http://www.rason.org/Projects/hbmic/mikschem.gif). The circuit works
> > perfect
> > >  when it's not connected to ethernut. I connect the output and the
> > ground to
> > >  channel0 of the ADC.
> > >
> > >  To my opinion, this is a hardware problem, because it doesn't matter
> > if the
> > >  program is running or not, the output of the opamp gives noise when
> > >  connected to Ethernut.
> > >  Anyone a clue what I'm missing?
> > >
> > >  Vincent
> > >  _______________________________________________
> > >  http://lists.egnite.de/mailman/listinfo/en-nut-discussion
> > >
> > _______________________________________________
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> >
>
>