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Message #23244
Re: PATCH: added QFNFootprintWizard
Hi guys,
The patches this plugin was relying on have all been merged.
I updated this patch to accordingly.
Cheers,
Mikael
On Tue, Feb 16, 2016 at 3:34 PM, Mikael Arguedas <mikael.arguedas@xxxxxxxxx>
wrote:
> Hi guys,
>
> Here is an updated version of this new qfn wizard.
> Changes:
> - fixed thermal pad numbering when no subdivision are requested (epad
> subdiv x= 0|1 or epad subdiv y =0|1). thanks to Peter Horvath testing.
> - set the attribute to SMD
> - round the courtyard to land on a 0.05mm grid (this feature relies on the
> patch of this thread
> <https://lists.launchpad.net/kicad-developers/msg23062.html>)
>
> Could you please let us know if you want to integrate/support wizards for
> components having thermal pads? I noticed that Maurice worked on similar
> kind of plugins in the past but they have never been merged.
>
> If you do want to integrate them, Peter and I are willing to add several
> features to this plugin and it's equivalent for SON footprints "son_wizard"
> plugin:
> - placing thermal vias centered on the thermal pad array
> - add a possibility of "outward extension" of the pad for people willing
> to generate HandSoldering version of the footprints
>
> Thanks!
> Mikael
>
>
> On Thu, Feb 11, 2016 at 2:13 PM, Mikael Arguedas <
> mikael.arguedas@xxxxxxxxx> wrote:
>
>> Hi,
>>
>> This patch adds a qfn_wizard.py plugin for footprint generation.
>> This is a copy of the qfp_wizard with a few changes allowing to center
>> the pads on the package outline and to add an array of exposed pads in the
>> center.
>>
>> I've seen similar works online from several people so I'm not sure if
>> this is a feature that you actually want to implement or already rejected
>> in the past
>>
>> Regards,
>> Mikael Arguedas
>>
>
>
=== modified file 'pcbnew/scripting/plugins/PadArray.py'
--- pcbnew/scripting/plugins/PadArray.py 2015-10-31 11:54:48 +0000
+++ pcbnew/scripting/plugins/PadArray.py 2016-02-18 19:02:31 +0000
@@ -169,6 +169,12 @@
self.AddPad(pad)
+class EPADGridArray(PadGridArray):
+
+ def NamingFunction(self, nx, ny):
+ return self.firstPadNum
+
+
class PadZGridArray(PadArray):
def __init__(self, pad, pad_count, line_count, line_pitch,
=== added file 'pcbnew/scripting/plugins/qfn_wizard.py'
--- pcbnew/scripting/plugins/qfn_wizard.py 1970-01-01 00:00:00 +0000
+++ pcbnew/scripting/plugins/qfn_wizard.py 2016-02-18 18:54:31 +0000
@@ -0,0 +1,161 @@
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+# MA 02110-1301, USA.
+#
+
+from __future__ import division
+import pcbnew
+
+import HelpfulFootprintWizardPlugin as HFPW
+import PadArray as PA
+
+class QFNWizard(HFPW.HelpfulFootprintWizardPlugin):
+
+ def GetName(self):
+ return "QFN"
+
+ def GetDescription(self):
+ return "Quad Flat No-lead footprint wizard"
+
+ def GenerateParameterList(self):
+ self.AddParam("Pads", "n", self.uNatural, 100)
+ self.AddParam("Pads", "pad pitch", self.uMM, 0.5)
+ self.AddParam("Pads", "pad width", self.uMM, 0.25)
+ self.AddParam("Pads", "pad length", self.uMM, 1.5)
+ self.AddParam("Pads", "oval", self.uBool, True)
+ self.AddParam("Pads", "epad subdiv x", self.uNatural, 2)
+ self.AddParam("Pads", "epad subdiv y", self.uNatural, 2)
+
+ self.AddParam("Package", "package width", self.uMM, 14)
+ self.AddParam("Package", "package height", self.uMM, 14)
+ self.AddParam("Package", "courtyard margin", self.uMM, 1)
+
+ def CheckParameters(self):
+ self.CheckParamInt("Pads", "*n", is_multiple_of=4)
+ self.CheckParamBool("Pads", "*oval")
+
+ def GetValue(self):
+ return "QFN_%d" % self.parameters["Pads"]["*n"]
+
+ def BuildThisFootprint(self):
+ pads = self.parameters["Pads"]
+
+ pad_pitch = pads["pad pitch"]
+ pad_length = pads["pad length"]
+ pad_width = pads["pad width"]
+
+ v_pitch = self.parameters["Package"]["package height"]
+ h_pitch = self.parameters["Package"]["package width"]
+
+ pads_per_row = pads["*n"] // 4
+
+ row_len = (pads_per_row - 1) * pad_pitch
+
+ pad_shape = pcbnew.PAD_SHAPE_OVAL if pads["*oval"] else pcbnew.PAD_SHAPE_RECT
+
+ h_pad = PA.PadMaker(self.module).SMDPad( pad_length, pad_width,
+ shape=pad_shape, rot_degree=90.0)
+ v_pad = PA.PadMaker(self.module).SMDPad( pad_length, pad_width, shape=pad_shape)
+
+ #left row
+ pin1Pos = pcbnew.wxPoint(-h_pitch / 2, 0)
+ array = PA.PadLineArray(h_pad, pads_per_row, pad_pitch, True, pin1Pos)
+ array.SetFirstPadInArray(1)
+ array.AddPadsToModule(self.draw)
+
+ #bottom row
+ pin1Pos = pcbnew.wxPoint(0, v_pitch / 2)
+ array = PA.PadLineArray(v_pad, pads_per_row, pad_pitch, False, pin1Pos)
+ array.SetFirstPadInArray(pads_per_row + 1)
+ array.AddPadsToModule(self.draw)
+
+ #right row
+ pin1Pos = pcbnew.wxPoint(h_pitch / 2, 0)
+ array = PA.PadLineArray(h_pad, pads_per_row, -pad_pitch, True,
+ pin1Pos)
+ array.SetFirstPadInArray(2*pads_per_row + 1)
+ array.AddPadsToModule(self.draw)
+
+ #top row
+ pin1Pos = pcbnew.wxPoint(0, -v_pitch / 2)
+ array = PA.PadLineArray(v_pad, pads_per_row, -pad_pitch, False,
+ pin1Pos)
+ array.SetFirstPadInArray(3*pads_per_row + 1)
+ array.AddPadsToModule(self.draw)
+
+ lim_x = self.parameters["Package"]["package width"] / 2
+ lim_y = self.parameters["Package"]["package height"] / 2
+ inner = (row_len / 2) + pad_pitch
+
+ # epad
+ epad_width = self.parameters["Package"]["package height"] - (2*pad_length)
+ epad_length = self.parameters["Package"]["package width"] - (2*pad_length)
+ epad_subdv_x = pads["*epad subdiv x"]
+ epad_subdv_y = pads["*epad subdiv y"]
+
+ if (epad_subdv_y != 0 and epad_subdv_x != 0) and (epad_subdv_y != 1 or epad_subdv_y != 1):
+ px = pcbnew.FromMM(0.1); py = pcbnew.FromMM(0.1)
+ esubpad_size_x = epad_length / epad_subdv_x - px
+ esubpad_size_y = epad_width / epad_subdv_y - py
+ epad1_pos = pcbnew.wxPoint(-(esubpad_size_x*(epad_subdv_x-1)/2), -esubpad_size_y*(epad_subdv_y-1)/2)
+ epad = PA.PadMaker(self.module).SMDPad( esubpad_size_y, esubpad_size_x,
+ shape=pcbnew.PAD_SHAPE_RECT, rot_degree=0.0)
+ array = PA.EPADGridArray(epad, epad_subdv_x, epad_subdv_y, esubpad_size_x + px, esubpad_size_y + py, pcbnew.wxPoint(0,0))
+ array.SetFirstPadInArray(pads["*n"]+1)
+ array.AddPadsToModule(self.draw)
+
+ else:
+ epad = PA.PadMaker(self.module).SMDPad(epad_length, epad_width)
+ epad_pos = pcbnew.wxPoint(0,0)
+ array = PA.PadLineArray(epad, 1, 1, False, epad_pos)
+ array.SetFirstPadInArray(pads["*n"]+1)
+ array.AddPadsToModule(self.draw)
+
+ #top left - diagonal
+ self.draw.Line(-lim_x, -inner, -inner, -lim_y)
+ # top right
+ self.draw.Polyline([(inner, -lim_y), (lim_x, -lim_y), (lim_x, -inner)])
+ # bottom left
+ self.draw.Polyline([(-inner, lim_y), (-lim_x, lim_y), (-lim_x, inner)])
+ # bottom right
+ self.draw.Polyline([(inner, lim_y), (lim_x, lim_y), (lim_x, inner)])
+
+ # Courtyard
+ cmargin = self.parameters["Package"]["courtyard margin"]
+ self.draw.SetLayer(pcbnew.F_CrtYd)
+ sizex = (lim_x + cmargin) * 2 + pad_length/2.
+ sizey = (lim_y + cmargin) * 2 + pad_length/2.
+ # round size to nearest 0.1mm, rectangle will thus land on a 0.05mm grid
+ sizex = self.PutOnGridMM(sizex, 0.1)
+ sizey = self.PutOnGridMM(sizey, 0.1)
+ # set courtyard line thickness to the one defined in KLC
+ thick = self.draw.GetLineThickness()
+ self.draw.SetLineThickness(pcbnew.FromMM(0.05))
+ self.draw.Box(0, 0, sizex, sizey)
+ # restore line thickness to previous value
+ self.draw.SetLineThickness(pcbnew.FromMM(thick))
+
+ #reference and value
+ text_size = self.GetTextSize() # IPC nominal
+ text_offset = v_pitch / 2 + text_size + pad_length / 2
+
+ self.draw.Value(0, text_offset, text_size)
+ self.draw.Reference(0, -text_offset, text_size)
+
+ # set SMD attribute
+ self.module.SetAttributes(pcbnew.MOD_CMS)
+
+QFNWizard().register()
+
+
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