kicad/pcbnew/python/plugins/bga_wizard.py

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# 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
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import FootprintWizardBase
import PadArray as PA
class BGAPadGridArray(PA.PadGridArray):
def NamingFunction(self, n_x, n_y):
return "%s%d" % (
self.AlphaNameFromNumber(n_y + 1, alphabet="ABCDEFGHJKLMNPRTUVWY"),
n_x + 1)
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class BGAWizard(FootprintWizardBase.FootprintWizard):
def GetName(self):
return "BGA"
def GetDescription(self):
return "Ball Grid Array Footprint Wizard"
def GenerateParameterList(self):
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self.AddParam("Pads", "pitch", self.uMM, 1, designator='p')
self.AddParam("Pads", "size", self.uMM, 0.5)
self.AddParam("Pads", "columns", self.uInteger, 5, designator="nx")
self.AddParam("Pads", "rows", self.uInteger, 5, designator="ny")
self.AddParam("Package", "width", self.uMM, 6, designator='X')
self.AddParam("Package", "length", self.uMM, 6, designator='Y')
self.AddParam("Package", "margin", self.uMM, 0.25, min_value=0.2, hint="Courtyard margin")
def CheckParameters(self):
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# check that the package is large enough
width = pcbnew.ToMM(self.parameters['Pads']['pitch'] * self.parameters['Pads']['columns'])
length = pcbnew.ToMM(self.parameters['Pads']['pitch'] * self.parameters['Pads']['rows'])
self.CheckParam('Package','width',min_value=width,info="Package width is too small (< {w}mm)".format(w=width))
self.CheckParam('Package','length',min_value=length,info="Package length is too small (< {l}mm".format(l=length))
def GetValue(self):
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pins = (self.parameters["Pads"]["rows"] * self.parameters["Pads"]["columns"])
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return "BGA-{n}_{a}x{b}_{x}x{y}mm".format(
n = pins,
a = self.parameters['Pads']['columns'],
b = self.parameters['Pads']['rows'],
x = pcbnew.ToMM(self.parameters['Package']['width']),
y = pcbnew.ToMM(self.parameters['Package']['length'])
)
def BuildThisFootprint(self):
pads = self.parameters["Pads"]
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rows = pads["rows"]
cols = pads["columns"]
pad_size = pads["size"]
pad_size = pcbnew.wxSize(pad_size, pad_size)
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pad_pitch = pads["pitch"]
# add in the pads
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pad = PA.PadMaker(self.module).SMTRoundPad(pads["size"])
px = (int)( -((cols - 1) * pad_pitch) / 2)
py = (int)(-((rows - 1) * pad_pitch) / 2)
pin1_pos = pcbnew.VECTOR2I( px, py )
array = BGAPadGridArray(pad, cols, rows, pad_pitch, pad_pitch)
array.AddPadsToModule(self.draw)
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# Draw box outline on F.Fab layer
self.draw.SetLayer(pcbnew.F_Fab)
ssx = self.parameters['Package']['width'] / 2
ssy = self.parameters['Package']['length'] / 2
# Bevel should be 1mm nominal but we'll allow smaller values
if pcbnew.ToMM(ssx) < 1:
bevel = ssx
else:
bevel = pcbnew.FromMM(1)
# Box with 1mm bevel as per IPC7351C
self.draw.SetLineThickness( pcbnew.FromMM( 0.1 ) ) #Default per KLC F5.2 as of 12/2018
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self.draw.BoxWithDiagonalAtCorner(0, 0, ssx*2, ssy*2, bevel)
# Add IPC markings to F_Silk layer
self.draw.SetLayer( pcbnew.F_SilkS )
self.draw.SetLineThickness( pcbnew.FromMM( 0.12 ) ) #Default per KLC F5.1 as of 12/2018
offset = self.draw.GetLineThickness()
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len_x = 0.5 * ssx
len_y = 0.5 * ssy
edge = [
[ ssx + offset - len_x, -ssy - offset],
[ ssx + offset, -ssy - offset],
[ ssx + offset, -ssy - offset + len_y],
]
# Draw three square edges
self.draw.Polyline(edge)
self.draw.Polyline(edge, mirrorY=0)
self.draw.Polyline(edge, mirrorX=0, mirrorY=0)
# Draw pin-1 marker
bevel += offset
pin1 = [
[ -ssx - offset + len_x, -ssy - offset],
[ -ssx - offset + bevel, -ssy - offset],
[ -ssx - offset, -ssy - offset + bevel],
[ -ssx - offset, -ssy - offset + len_y],
]
# Remove lines if the package is too small
if bevel > len_x:
pin1 = pin1[1:]
if bevel > len_y:
pin1 = pin1[:-1]
self.draw.Polyline(pin1)
# Draw a circle in the bevel void
self.draw.Circle( -ssx, -ssy, pcbnew.FromMM(0.2), filled=True)
# Courtyard
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cmargin = self.parameters['Package']['margin']
self.draw.SetLayer(pcbnew.F_CrtYd)
sizex = (ssx + cmargin) * 2
sizey = (ssy + cmargin) * 2
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# round size to nearest 0.1mm, rectangle will thus land on a 0.05mm grid
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sizex = pcbnew.PutOnGridMM(sizex, 0.1)
sizey = pcbnew.PutOnGridMM(sizey, 0.1)
# set courtyard line thickness to the one defined in KLC
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self.draw.SetLineThickness(pcbnew.FromMM(0.05))
self.draw.Box(0, 0, sizex, sizey)
# restore line thickness to previous value
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self.draw.SetLineThickness(pcbnew.FromMM(cmargin))
#reference and value
text_size = self.GetTextSize() # IPC nominal
ypos = ssy + text_size
self.draw.Value(0, ypos, text_size)
self.draw.Reference(0, -ypos, text_size)
# set SMD attribute
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self.module.SetAttributes(pcbnew.PAD_ATTRIB_SMD)
BGAWizard().register()