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From: | "Britton Kerin (britton DOT kerin AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> |
Date: | Thu, 18 Apr 2024 04:11:06 -0700 |
Message-ID: | <CAC4O8c_2XBpaWFNU9g5EJn0dXU=ZH=avSoFas10xsP+b3jMAJw@mail.gmail.com> |
Subject: | Re: [geda-user] Allowing pins/pads with zero clearance to contact polygons |
To: | geda-user AT delorie DOT com |
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Reply-To: | geda-user AT delorie DOT com |
On Thu, Apr 18, 2024 at 3:29 AM Onetmt (onetmt AT gmail DOT com) [via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote: > > > Il giorno mar, 23/01/2024 alle 20.52 -0900, Britton Kerin (britton DOT kerin AT gmail DOT com) [via geda-user AT delorie DOT com] ha scritto: > > A while back there was some discussion here about different ways of > connecting pins/pads to polygons (e.g. ground pads to ground plane). > At least some people like to do this by setting the clearance for the > pin/pad to zero, then simply drawing the ground plane over the part. > It's a nice way to do it because it removes the need to have little > hard-to-select traces everywhere to connect e.g. ground pins to ground > plane (which in turn makes it much less painful to move parts around > after the fact. > > > Yes, please, keep the zero clearance feature working - my last 10 years projects rely on that :-) I've fixed this in my private mini-fork but I don't know if there's any appetite to merge it into anything official. Britton > > > This used to work without any DRV violations, but a fix to the polygon > clearance tests by Charles Parker in de49a513 seems to show that it > only ever worked by accident. > > However the current code in master contains this code that explicitly > allows zero-clearance vias to contact polygons: > > case VIA_TYPE: > if (clearance == 0) > { > /* Vias with zero clearance are allowed, make sure it's connected. */ > if (obj_touches_poly(&thing1, polygon, GetLayerNumber(PCB->Data, layer))) > break; > else > { > /* not connected to the polygon, raise an error*/ > new_polygon_not_connected_violation (layer, polygon); > break; > } > } > > I think this same condition should apply to PAD_TYPE and PIN_TYPE objects as > well, because it's essentially correct to take zero to mean zero, and incorrect > to do otherwise. > > What I don't agree with is the subsequent requirement that the object touch the > nearby polygon, for the following reasons: > > * It adds significantly more meaning to clearance == 0 than that setting > explicitly states > > * As implemented it triggers on nearby polygons that aren't meant to be > connected > > * As implemented the message doesn't make clear what the problem is (refers > only to flag and doesn't mention clearance) and gives a wrong prescription > for the case of a nearby polygon that isn't supposed to be connected. > > * It doesn't catch thin connections (as happens for DRC elsewhere) anyway > > * Complete misses with polys that are supposed to be connected are caught by > connectivity anyway > > Changing this to honor the literal meaning of clearance == 0 while not adding > any unexpected implicit meaning would be fairly low-risk: it wouldn't change > any existing board, and would only impact users who have deliberately set > clearance to zero. So far as I know none of the available footprint libraries > ship footprints with clearance set that way by default. > > Thoughts? > > Britton
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