Re: gEDA-user: modify footprint and update layout

[Steve Morss <smorss@xxxxxxxxxxxxxxxxxxxxx>]

A year or two ago, I made a footprint replacement program which worked 
very well for me (I used it to swap out a few hundred parts with about 
50 different footprints).  It worked like this ...  It assumed the 
description was the file name.  Then it looked at the parts in the pcb 
file, compared them to the new parts (with the same name), and put the 
new footprints on the same side of the board with the same rotation.  It 
tried not to make too many assumptions about the relationship between 
the old and new parts.  The origins needed to be in the same relative 
spots and the pin numbering order couldn't change (too much).   For each 
footprint, it tried rotations of 0, 90,180, 270 degrees, and if all the 
pins ended up in the same quadrants, it assumed the rotation was good 
and used it.  If it couldn't find a rotation, it told you so.  This 
algorithm allows silkscreens to change aribitrarily and pad sizes and 
shapes to change arbitrarily.  If things go well, it writes a new pcb 
file with all the footprints updated.  It was all very scriptable - I 
ran it as part of a Makefile.  It's all written in Perl.  If you are 
interested, I could pull together a set of files and post them.

Steve


DJ Delorie wrote:
>> What are the most common reasons that you need to change land patterns?
>>     
>
> Silkscreen changes
>
> Thermal pads - mostly for making paste masks
>
>
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