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From:	karl AT aspodata DOT se
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] why pinnumber in sym pins?
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Comments:	In-reply-to Roland Lutz <rlutz AT hedmen DOT org>
	message dated "Tue, 02 Jan 2018 20:30:49 +0100."
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Date:	Sat, 6 Jan 2018 16:53:14 +0100 (CET)
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Roland:
> On Tue, 26 Dec 2017, karl AT aspodata DOT se wrote:
...
> > So, it would be nice if one could map sym -> fp with just the "pinlabel" 
> > (gschem) -> pin "Name" (pcb). But pcb doesn't seem to support that idea.
> 
> In fact, the term "pinnumber" may be misleading because it doesn't need to 
> be a number.  You could use "S", "G", and "D" as pinnumbers for a 
> transistor symbol, or "shield" as a pinnumber for a shield pin, and then 
> map that to a physical position via the footprint.

Sorry, didn't know that.

> > E.g. dc/dc converters with single output usually have four pins +/-Vin 
> > and +/-Vout in all sorts of packages where the pinnumber (from the 
> > datasheet) can be anything but 1,2,3,4, but their pin names are 
> > +/-Vin/Vout.
> 
> > Any suggestions or pointers ?
> 
> In this example, just use "+Vin", "-Vin" and so on (or some PCB-friendly 
> variant of that) as the pinnumbers.

Ok, I get it and done some testing in http://turkos.aspodata.se/tmp/gEDA/pinnumber/

So, in a sym file (dcdc_isol.sym), a:

P 300 200 0 200 1 0 1
{
T 275 225 5 6 1 1 0 6 1
pinnumber=-Vin
}

gives the correct net:

$ fgrep -e -Vin test.net 
0V      U1--Vin X1-1 U2--Vin 
$

where U1--Vin is matched by pcb to the second "-Vin" (the pins "number")
in the fp:

  Pin [   0.000mm   0.000mm    2.000mm   0.500mm   2.400mm   1.000mm "-Vin" "-Vin" "" ]

giving me the correct ratsnet in test.pcb.

///

That implies that I potentially need two fp for the same thing:
, one with numbers, if I use numbers in the sym file
. one with names, if I use names in the sym file

Regards,
/Karl Hammar

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