pads.py

#!/usr/bin/python

import math

#Parameter zum einstellen:

#Pad-Masse

pad_length = '1.2mm'

pad_width = '0.3mm'

#Pads pro Seite

pads_per_side = 44

#Abstand der gegenueberliegenden Pad-Reihen (Mitte der Pads)

pad_row_distance = 26.7 - 1.2

#Abstand zwischen den mitten der aeusseren Pads einer Seite

pads_side_length = 21.8 - 0.3

#Siehe Eagle-Doku zu 'SMD'

pad_roundness = '0'

# 4 fuer TQFP etc, 2 fuer SO

sides = 4 # oder 2

#finger weg_

_pad_counter = 1

def smd(pos, orientation, name):

    return "SMD %s %s -%s R%f '%s' (%fmm %fmm)" % (pad_length, pad_width, pad_roundness, orientation, name, pos[0], pos[1])

def rad2deg(a):

    return 180.0 * a / math.pi

def pad_name(i):

    return '%d' % i

def pad_line(start, end, num):

    global _pad_counter

    res = list()

    x_delta = end[0] - start[0]

    y_delta = end[1] - start[1]

    angle = rad2deg(math.atan2(y_delta, x_delta)) + 90.0

    for i in range(num):

        x = start[0] + (end[0] - start[0]) * float(i) / float(num -1 )

        y = start[1] + (end[1] - start[1]) * float(i) / float(num -1 )

        res.append(smd((x,y), angle, pad_name(_pad_counter)))

        _pad_counter += 1

    return res

def create_footprint():

    res = []

    if sides == 4:

        left = ((-pad_row_distance / 2.0, pads_side_length / 2.0), (-pad_row_distance / 2.0, -pads_side_length / 2.0))

        bot =  ((-pads_side_length / 2.0, -pad_row_distance / 2.0), (+pads_side_length / 2.0, -pad_row_distance / 2.0))

        right =((pad_row_distance / 2.0, -pads_side_length / 2.0), (pad_row_distance / 2.0, pads_side_length / 2.0))

        top =  ((pads_side_length / 2.0, pad_row_distance / 2.0), (-pads_side_length / 2.0, pad_row_distance / 2.0))

        res.extend(pad_line(left[0], left[1], pads_per_side))

        res.extend(pad_line(bot[0], bot[1], pads_per_side))

        res.extend(pad_line(right[0], right[1], pads_per_side))

        res.extend(pad_line(top[0], top[1], pads_per_side))

    elif sides == 2:

        left = ((-pad_row_distance / 2.0, pads_side_length / 2.0), (-pad_row_distance / 2.0, -pads_side_length / 2.0))

        right =((pad_row_distance / 2.0, -pads_side_length / 2.0), (pad_row_distance / 2.0, pads_side_length / 2.0))

        res.extend(pad_line(left[0], left[1], pads_per_side))

        res.extend(pad_line(right[0], right[1], pads_per_side))

    return '\n'.join(res)

if __name__ == '__main__':

    print create_footprint()