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

[Vincent Timmerman]

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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