kicad-developers team mailing list archive

[Maciej Sumiński <maciej.suminski@xxxxxxx>]

On 09/24/2015 03:24 PM, jp charras wrote:
> Le 24/09/2015 14:38, Maciej Sumiński a écrit :
>> Hi Jean-Pierre,
>>
>> On 09/24/2015 01:53 PM, jp charras wrote:
>>> Orson,
>>>
>>> Could you have a look at these few issues:
>>>
>>> - When the number of layers is increased (for instance from 2 to
>>> 4 layers), the tracks drawn on the new layers (for instance usung
>>> the legacy mode) are not displayed in OpenGl mode , until the
>>> board is saved, Kicad closed and reopened.
>>
>> I have tried to reproduce the problem, but I failed. This is what I
>> did (revision 6212):
>>
>> 1a) start in OpenGL canvas or b) start in legacy canvas 2) create a
>> new board (2 layers by default) 3) use Layers Setup dialog to
>> increase the number of layers to 4 4) switch to legacy canvas 5)
>> draw a few tracks on inner layers 6) switch to OpenGL canvas, new
>> tracks are visible
> 
> After investigations:
> If you increase layers count on OpenGL canvas, there is no issue.
> If you increase layers count on legacy canvas, add a trach or pcb text
> on a new inner layer, and then switch to OpenGL, there is a visibility
> issue (tested with demo "interf_u.kicad_pcb")

Thank you, the hints were helpful. It should be fixed in revision 6215.

>>> - Microvias layers are incorrect: currently, it is created from
>>> the top to the bottom layer. This is incorrect. It can be
>>> discussed, but a microvia is usually created between 2 adjacent
>>> layers, and in Pcbnew, it is restricted to an external layer to 
>>> the near inner layer. Change it needs adding code in DRC and to
>>> manage uvia sizes and holes diameter depending on the number of
>>> layers and their thickness. And this option makes sense for
>>> microvias on pads, which are really restricted to the external
>>> layer to the near inner layer.
>>
>> I have never used microvias before, so I should not argue about
>> the constraints. I see the described issue now, it will be fixed.

Should be good now.

>>> - blind/buried vias cannot be inserted (always an error
>>> message). When inserting a blind/buried via, the target layer
>>> choice should be shown (and/or the dialog to choose the layer
>>> pair should be accessible in GAL mode). My preference is just
>>> show the target layer choice (see legacy mode).
>>
>> There are two ways to insert vias in legacy mode: - based on the
>> currently selected layer pair (Layer Pair dialog) - picking the
>> target layer on every insert (as you mentioned)
>>
>> At the moment GAL offers only the first method, but I agree the
>> second one seems to be more convenient. I will add it, but I guess
>> it has to wait until the stable release happens, so it can be
>> merged.
>>
>> What is the error message? I might be missing some information
>> here.
> 
> Sorry, my bad.
> 
> When I encountered this "issue", the currently selected layer pair was
> Front+back, and the error message was "Only through vias can be placed
> between front and bottom layers".
> Therefore no bug.
> 
> I don't know what is the best way in this case:
> - Show this message.
> - Place a through via.
> - Place a blind/buried via which is on all layers (which is what
> happens in legacy mode).

I picked the third option, it seems to me the most sensible one.

Regards,
Orson

>>> Remark: I like the way blind/buried vias are shown in GAL mode.
>>> Perhaps a similar way could be used for microvias ( which are in
>>> fact just blind/buried vias with a specific size)
>>
>> Good point, it should not be very hard to modify.
>>
>> Regards, Orson
>>
> 
>

Attachment: signature.asc
Description: OpenPGP digital signature