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Date: Sat, 6 Jan 2018 20:28:40 +0100
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] why pinnumber in sym pins?
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> Niklas:
> ...
> > I understand the mapping and use gschem and pcb often though. Even
> > though current mechanism work I think about if it could be improved.
> 
> Ok.
> 
> Using some text in the pinnumber attribute works well enough:
> like in 
> 
> P 300 200 0 200 1 0 1
> {
> T 275 225 5 6 1 1 0 6 1
> pinnumber=-Vin
> }
> 
> which gives me a sane netlist like:
> 
> 0V      U1--Vin X1-1 U2--Vin 
> 
> What could be improved is that pcb could map the -Vin from the netlist
> to this pin in the footprint:
> 
> a:  Pin [   0.000mm   0.000mm    2.000mm   0.500mm   2.400mm   1.000mm "-Vin" "1" "" ]
> 
> so I don't have the edit it to look like:
> 
> b:  Pin [   0.000mm   0.000mm    2.000mm   0.500mm   2.400mm   1.000mm "-Vin" "-Vin" "" ]
> 
> I.e., if not fount the "pinnumber" in the "number" field, look at the
> "name" field.
> 
> Another way to do the same thing is to have two fp, one with pin
> definitions like a above, and one like b.
> 
> ///
> 
> What improvement did you think of ?

Avoid duplicate information, normally I think the visible label is a good identifier just because it's visible on the schematic. Pin mapping is not always ideal to have in symbol but work well sometimes, it need to be somewhere, kept me thinking but did not come up with anything perfect, in sort of it come later in workflow but ... In cschem I pin mapping is handled by plugin.

Overall gschem is a great program to draw schematics, it is simple to make symbols and connect them, attributes could be added as needed.