kicad-developers team mailing list archive

[Jonas Diemer <diemer@...>]

Hello,

as I have mentioned last week, DRC Pad2Pad checks are currently incomplete. 
Right now, DRC violations between pads that are rotated by an angle not a 
multiple of 90° are not detected.

To prevent undetected DRC problems, I think we should be conservative and emit 
a DRC error whenever there are rotated pads for which we do not have a DRC 
check in place, i.e.

Index: pcbnew/drc.cpp
===================================================================
--- pcbnew/drc.cpp (Revision 1954)
+++ pcbnew/drc.cpp (Arbeitskopie)
@@ -1144,6 +1144,7 @@
else // Any other orient
{
/* TODO : any orient ... */
+ diag = true; // ... until we have fixed this, we assume DRC 
violation.
}
}
break;

What do you think? Should this go into SVN until we have a fix? Who is 
currently working on DRC?

Regards
Jonas


Am Freitag, 4. September 2009 17:47:17 schrieb Jonas Diemer:
> Hi everyone,
>
> find attached a board that generates a false alert in DRC. A "pad near pad"
> error is emitted for every pad of a TQFP-32.
>
> The problem seems to occur only if the footprint is rotated by 45°+n*90°
> (450, 1350, ...).
> This is due to an incorrect check of orientation in drc.h for the "trivial"
> case that both rectangular pads are oriented by multiple of 90°. The old
> check only tested if both pads were relatively aligned by a multiple of
> 90°, which was also true if both were rotated e.g. by 45°.
>
> I fixed this in r1952.
>
> I also noticed that other orientations are NOT CHECKED AT ALL, which
> basically means that DRC errors are not detected for rectangular pads that
> are not aligned to 90°!!! This is kind of bad, although it is marked asa
> TODO.
>
> Unfortunately, the fix is non-trivial (at least to me)...
>
> Best regards,
> Jonas
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>