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

[jakub nowak]

For me there is no difference to change a fuse bit or registry. I
don't have any JTAG, I don't use debug, I want to use atmega128 as
atmega128 I don't need compatibility with atmega103. I know that if
You have JTAG better will be to change this by software but try by
hardware(manualy fusebits). I think that only risk changing fuse bits
is when You program with JTAG and You will turn him off or when You
change to wrong values fuses connected with oscilator.

2008/3/12, Vincent Timmerman <vincenttimmerman at gmail.com>:
> 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
>  > > >  _______________________________________________
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>  > > >
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