| ID: | 3279 |
| From: | ge...@igor2.repo.hu |
| Date: | Sun, 18 Aug 2019 08:26:40 +0200 (CEST) |
| Subject: | Re: [pcb-rnd] pcblib: parametric footprint script switchover: |
| in-reply-to: | 3277 from ge...@igor2.repo.hu |
| replies: | 3280 from Gabriel Paubert <pa...@iram.es> |
>On Sat, 17 Aug 2019, gedau@igor2.repo.hu wrote: > >>With keeping 100% backward compatibility, we will have some extensions, >>mainly new parameters controlling aspects of padstacks that were >>impossible to control with the old format. I will write separate >>announcements about these when they are implemented > After the pad_paste_ratio and pad_paste offs, the second set of new features is about mask: 1. optional pad_mask_ratio, pin_mask_ratio When specified, mask opening size is copper size multiplied by this number. 2. optional pad_mask_offs and pin_mask_offs (mm or mil) When specified, mask opening size is copper size plus this value Note: you need to use pad_* for the smd pads and pin_* for the through-hole pins. Only the "normal" pads are affected, the (optional) center pad (e.g. in a qfn) is a special case that has separate parameters. If multiple sources try to set paste dimensions, the logic is as follows (same as for paste): 1. if there is a per footprint generator script value, we are going to use that 2. else if there's an absolute value (pad_mask, pin_mask) for the paste thickness, we use that 3. else if there's an offset (pad_mask_offs, pin_mask_offs), use that 4. else if there is a ratio (pad_mask_ratio, pin_mask_ratio), use that Because of the backward compatibility, we unfortunately have pad_mask and pin_mask defined as default. This normally overrides the offs and ratio. To start using the ratio or the offs, you also need to include a pad_mask=- or pin_mask=- to cancel the default absolute value. (This is unlike with paste, because we didn't have a hardwired default paste absolue value to cancel). Note: this feature is in the common code of parametric footprints, not in pcb-rnd. Once the footprint is generated, the actual shape and size of the paste is hardwired numerical data and does not depend on copper shape any more. In other words these values affect how the generator works, but once the footprint is generated, the paste shape becomes independent. However, one can always change the parameter and re-generate the footprint and replace the old with the new, in-place. Regards, Igor2
Reply subtree:
3279 Re: [pcb-rnd] pcblib: parametric footprint script switchover: from ge...@igor2.repo.hu
3280 Re: [pcb-rnd] pcblib: parametric footprint script switchover: from Gabriel Paubert <pa...@iram.es>
3281 Re: [pcb-rnd] pcblib: parametric footprint script switchover: from ge...@igor2.repo.hu