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Tue, 08 Dec 2015 13:22:10 -0800 (PST) | |
Date: | Tue, 8 Dec 2015 22:22:04 +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] gsch2pcb after refdes-renum? (If implemented |
syncronization detail) | |
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> > Changes compare schematic file with pcb file so it is done manually > > and I guess it is fine like this. For idempotent changes applying > > them more than once make no difference. > > What we have now breaks down in a simple case. Consider: we want to > rename U1, U2, and U3 to be U2, U3, and U1 (note the cyclic > dependency). ExecuteScript() would have something like this: > > Rename(U1,U2) > Rename(U2,U3) > Rename(U3,U1) > > There is no "correct" order to do these in, but even if the script is > smart enough to use a temporary name for one of the symbols, or pcb > was smart enough to know old vs new names, running the script twice > would "rotate" the names again. > > Hence, my position that something other than refdes is needed to > identify "this symbol" or "that gate". Tracking the lifetime of a > symbol so you can refer to "the one I used back when" is the trick > part I was asking about. > > If we really want to cleanly support simple operations like "rename a > part" we need to change gaf's dependency on the name identifying "the > part", and start treating the refdes like any other generic attribute. I could put it down like this: 0. There bust be knowledge of link between symbol <--> footprint, even though it is not really a link. Alternative 1 unique number is used to link: 1. They have the same unique number. Alternative 2 refdes is used to link: 1. refdes must be unique. 2. Old and new refdes must be known. 2. Change need to be applied exactly once. Alternative 2 topology is used to link: 1. This type of part connected to these nets. 2. There may be a lot of decoupling capacitors in parallel. If all three where supported I would try them in the order Alternative 1,2,3 until link is found. If i should implement it in gEDA I would probably choose Alternative 2 to keep the file format, this is a little bit special case. To find out if a rename have occured the information is available then the rename happen or by comparing new schematic file with old schematic file. Nicklas Karlsson
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