Re: gEDA-user: Interpreter for automation schematics

[John Erlandsson <john@xxxxxxxxxxx>]

   There are a few attributes left from my awk attempts.
   I used crossref-ms-no to keep track of how many subsymbols where
   related to that specific symbol.
   When the script found a coil, say K1. It went in to a loop browsing for
   subsymbols with the same refdes. When one was found it changed its
   crossref attribute and stored its coordinates.
   The coordinate ranges was hardcoded in a function that translated them
   somewhat randomly to "letter and number". I guess that a "prefer left"
   strategy would be better.
   Hidden attributes is a good idea for portability.
   The idea with the cross-reference labels, was to only allow two with
   the same name. Since I label all of the wires on my panels with unique
   numbers. Your suggestion is better, more readable and less typing.
   I am currently looking at the examples you suggested. Trying to break
   them down to read/write attributes. But I need to study guile a lot
   harder.
   Thanks for helping.
   //John
   On 03/29/2011 04:11 PM, Peter Clifton wrote:

     Thanks..
What does the attribute crossref-ms-no mean? Is that how the contacts of
a contactor can refer back to the location of the coil? Obviously each
piece which is cross-reference-able needs to be identifiable, so the
correct location is discovered.

With regards the location cross-references labels, such as XR1, what
happens if there are more than two locations? Is it only allowed that
two exist?

For producing correct electrical netlists, it is important that you
assign the same netname to each object. I "think" this will work the way
you have drawn, but it deviates quite a lot from what is "normal
practice" in gEDA.

Usually (when drawing schematics for PCBs / simulations), we label nets
with a "netname=..." attribute, or (sometimes), to use a flag symbol
like you have, with no refdes= attribute, but instead give it a
"net=foo:1" (connecting net "foo" to the whatever is attached to pin 1
of the flag symbol).

In order to implement this generically, I imagine your title block could
be given some hidden attributes which describe the coordinate ranges
inside it which correspond to different grid coordinates.

Additionally.. what happens if an item being cross-references spans
multiple grid coordinates? Can the choice be random, or does it need to
be the one with most of the symbol in it - or top-left one, or some
other rule?






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