kicad-developers team mailing list archive

[Maciej Sumiński <maciej.suminski@xxxxxxx>]

Hi Wayne,

No, I have not reviewed the patch. I had some doubts about potential
problems caused by invisible pins creating hidden connections. If user
is neither aware of their presence when selecting a symbol, nor will
notice them after they are placed on a schematic sheet then he may end
up accidentally connecting them to some wires. IIRC we do not have an
ERC test to check against such case, so I was not sure if it is a safe
change.

Cheers,
Orson

On 02/07/2018 02:21 PM, Wayne Stambaugh wrote:
> Orson,
> 
> Did you ever respond to Jon about this?  I guess the question is whether
> or not to show invisible pins in the component chooser.
> 
> Cheers,
> 
> Wayne
> 
> On 1/15/2018 9:31 PM, Jon Evans wrote:
>> Hi Orson, patch is attached again, hopefully it goes through this time.
>>
>> Thanks,
>> Jon
>>
>> On Mon, Jan 15, 2018 at 4:24 AM, Rene Pöschl <poeschlr@xxxxxxxxx
>> <mailto:poeschlr@xxxxxxxxx>> wrote:
>>
>>     On 15/01/18 10:00, Maciej Sumiński wrote:
>>
>>         Perhaps we should have an ERC rule
>>         that warns about invisible pins being connected to a wire, any
>>         thoughts?
>>
>>
>>     Invisible pins are used for three distinct applications.
>>
>>     The first one is to remove clutter by hiding pins that should not be
>>     connected. ERC will complain if you connect such pins if they have the
>>     electrical type "Not connected".
>>
>>     The second application is to create "power labels". A invisible power
>>     input pin is handled as a global label. These pins are meant to be
>>     connected.
>>
>>     The third application is again to remove clutter by stacking pins. Here
>>     you have one visible pin and several other invisible pins at the same
>>     location. (Normally all these pins have the same name and electrical
>>     type. With the exception of power input pins, power output pins and
>>     output pins.)
>>     Such pins are again meant to be connected.
>>
>>     This means a ERC rule that complains about connecting hidden pins will
>>     create too many false positives. Having a lot of false positives means
>>     users will start to ignore ERC output.
>>
>>     It might be a good idea to have a symbol checker that complains if
>>     invisible pins are used differently than i described above.
>>     In other words: complain for invisible pins if they are not part of a
>>     stack or of types NC or power input.
>>
>>
>>
>>
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> 
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