Re: gEDA-user: Problems with subnets containing short-circuits

[Arvid Rosén <arvid@xxxxxxxxxx>]

Stuart Brorson wrote:
> I guess I don't see how shorting around a circuit involves connecting
> two nets which don't connect to anything else.  Can you post a
> simplified version of what you are trying to do?  We can look at it
> during the code sprint.
>   
Ok, I attached two sch-files which I think illustrates the problem quite 
well.
I tried this with the gnet-geda backend, and it fails discover that 
Rtop1 and Rtop2 should be connected.
> Meanwhile, why not stick a zero ohm resistor into the shorting net,
> similar to what John suggests?   That way gnetlist has a component
> which will preserve the net. 
>
> Stuart
>   
Yeah, sure. This is no problem as long as you are aware of it. But I 
just spent one day looking for errors in my netlister-backend.
I still think this is a strange behavior.

/Arvid




>   
> > Stuart Brorson wrote:
> >     
> > > Just out of curiosity, why would you want to have two nets which
> > > connect to nothing other than each other?
> > >
> > > Before we label it a bug, what is the goal of this construct? =20
> > >
> > > Stuart
> > >  =20
> > >       
> > Hi Stuart!
> > That's a good question. The construct itself is quite pointless.=20
> > However, I was working on a quite complex design with two=20
> > filter-subcircuits. I wanted to test some aspects of my circuit, so I=20
> > shorted the first filter just to bypass it, which resulted in an open=20
> > circuit instead of a bypass! That is quite annoying, don't you think?
> > The possibility to bypassing stuff is always important when debugging.
> >
> > Cheers
> > Arvid
> >     
> > >  =20
> > >       
> > > > John Luciani wrote:
> > > >    =20
> > > >         
> > > > > On 7/20/06, Arvid Ros=3DE9n <arvid@xxxxxxxxxx> wrote:
> > > > >      =20
> > > > >           
> > > > > > However, I also tried to make a 2-pin subnet containing only a
> > > > > > short-circuit. This connection was completely ignored by gnetlist!!
> > > > > >
> > > > > > Could someone confirm this?
> > > > > >        =20
> > > > > >             
> > > > > You are correct. If you have two nets that only connect to each other
> > > > > the connection does not show up in the netlist.
> > > > >
> > > > > I get around this by connecting one of the nets to a component.
> > > > >
> > > > > (* jcl *)
> > > > >
> > > > >      =20
> > > > >           
> > > > Ok, thanks!
> > > > Shouldn't that be considered as a pretty severe bug? I am new here,=3D=
> > > >         
> > 20
> >     
> > > > maybe it's already reported.
> > > >
> > > > /Arvid
> > > >
> > > > --=3D20
> > > > Arvid Ros=3DE9n
> > > > Softube AB
> > > > Teknikringen 7
> > > > S-583 30 Link=3DF6ping
> > > > Sweden
> > > > Phone: (+46) 13 21 16 23
> > > > Mobile: (+46) 73 25 12 34 7
> > > > Mail: arvid@xxxxxxxxxx
> > > > URL: www.softube.se
> > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > geda-user mailing list
> > > > geda-user@xxxxxxxxxxxxxx
> > > > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
> > > >
> > > >    =20
> > > >         
> > >
> > > _______________________________________________
> > > geda-user mailing list
> > > geda-user@xxxxxxxxxxxxxx
> > > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
> > >  =20
> > >       
> > --=20
> > Arvid Ros=E9n
> > Softube AB
> > Teknikringen 7
> > S-583 30 Link=F6ping
> > Sweden
> > Phone: (+46) 13 21 16 23
> > Mobile: (+46) 73 25 12 34 7
> > Mail: arvid@xxxxxxxxxx
> > URL: www.softube.se
> >
> >
> >
> > _______________________________________________
> > geda-user mailing list
> > geda-user@xxxxxxxxxxxxxx
> > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
> >
> >     
>
>
>
> _______________________________________________
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>   


--
Arvid Rosén
Softube AB
Teknikringen 7
S-583 30 Linköping
Sweden
Phone: (+46) 13 21 16 23
Mobile: (+46) 73 25 12 34 7
Mail: arvid@xxxxxxxxxx
URL: www.softube.se

v 20060123 1
C 1000 4500 1 0 0 in-1.sym
{
T 1000 4800 5 10 1 1 0 0 1
refdes=3
}
C 4600 6100 1 180 0 in-1.sym
{
T 4600 5800 5 10 1 1 180 0 1
refdes=2
}
C 1000 5900 1 0 0 in-1.sym
{
T 1000 6200 5 10 1 1 0 0 1
refdes=1
}
N 1600 6000 4000 6000 4
C 4600 4700 1 180 0 in-1.sym
{
T 4600 4400 5 10 1 1 180 0 1
refdes=4
}
C 2300 4500 1 0 0 resistor-1.sym
{
T 2500 5000 5 10 1 1 0 0 1
refdes=R34
T 2500 4800 5 10 1 1 0 0 1
value=10k
}
N 2300 4600 1600 4600 4
N 3200 4600 4000 4600 4

v 20060123 1
N 5000 9500 4300 9500 4
C 5000 9200 1 0 0 test.sym
{
T 5400 10300 5 10 1 1 0 0 1
refdes=Utest
T 5400 9200 5 10 1 1 0 0 1
device=test
T 5000 9200 5 10 1 0 0 0 1
source=test.sch
}
C 1700 8200 1 0 0 vac-1.sym
{
T 2400 8850 5 10 1 1 0 0 1
refdes=Vin
T 2400 8650 5 10 1 1 0 0 1
value=dc 0 ac 1
}
C 3400 9900 1 0 0 resistor-1.sym
{
T 3600 10400 5 10 1 1 0 0 1
refdes=Rtop1
T 3600 10200 5 10 1 1 0 0 1
value=10k
}
C 1900 7300 1 0 0 gnd-1.sym
N 2000 8200 2000 7600 4
N 2000 9400 2000 10000 4
N 6800 9500 7600 9500 4
N 7600 10000 6800 10000 4
N 2000 8000 9000 8000 4
N 9000 9100 9000 10000 4
N 3400 10000 2000 10000 4
N 4300 10000 5000 10000 4
C 4300 9600 1 180 0 resistor-1.sym
{
T 4100 9100 5 10 1 1 180 0 1
refdes=Rtop3
T 4100 9300 5 10 1 1 180 0 1
value=10k
}
N 3400 9500 3000 9500 4
N 3000 9500 3000 10000 4
C 7600 9900 1 0 0 resistor-1.sym
{
T 7800 10400 5 10 1 1 0 0 1
refdes=Rtop2
T 7800 10200 5 10 1 1 0 0 1
value=10k
}
C 8500 9600 1 180 0 resistor-1.sym
{
T 8300 9100 5 10 1 1 180 0 1
refdes=Rtop4
T 8300 9300 5 10 1 1 180 0 1
value=10k
}
N 9000 10000 8500 10000 4
N 8500 9500 9000 9500 4
C 8900 9100 1 270 0 resistor-1.sym
{
T 9400 8900 5 10 1 1 270 0 1
refdes=Rload
T 9200 8900 5 10 1 1 270 0 1
value=10k
}
N 9000 8200 9000 8000 4


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