2 * Copyright © 2012 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 real pad_width = 0.55;
22 real metal_width = 0.32;
23 real metal_height = 0.24;
24 real pad_height = 0.30;
25 real pad_spacing = 0.50;
26 real pad_clearance = 12 / 1000 * 25.4;
28 real center_width = 2;
29 real center_height = 2;
31 real package_width = 3;
32 real package_height = 3;
34 real pad_x_off = package_width / 2 - metal_width;
35 real pad_y_off = package_height / 2 - metal_width;
37 real num_pad = 4; /* per side */
39 element_start("qfn16-3x3");
42 return pad_spacing * (n - (num_pad - 1) / 2);
45 real corner(int dx, int dy) {
46 real x = dx * package_width / 2;
47 real y = dy * package_height / 2;
50 line(x, y, x - dx * len, y);
51 line(x, y, x, y - dy * len);
61 line(-package_width/2 + dot_off, -package_height/2 + dot_off,
62 -package_width/2 + dot_off, -package_height/2 + dot_off);
64 for (pad = 0; pad < num_pad; pad++) {
67 pad_mm_clear(-pad_x_off - pad_width / 2,
72 sprintf("%d", pad + 1),
73 sprintf("%d", pad + 1));
77 pad_mm_clear(pad_off(pad),
78 pad_y_off + pad_width / 2,
82 sprintf("%d", pad + 5),
83 sprintf("%d", pad + 5));
85 /* right side (9-12) */
87 pad_mm_clear(pad_x_off + pad_width / 2,
92 sprintf("%d", pad + 9),
93 sprintf("%d", pad + 9));
97 pad_mm_clear(-pad_off(pad),
98 -pad_y_off - pad_width / 2,
102 sprintf("%d", pad + 13),
103 sprintf("%d", pad + 13));
109 real block_width = center_width / pad_blocks;
110 real block_height = center_height / pad_blocks;
112 real block_x(int x) = (x - (pad_blocks - 1)/2) * block_width;
113 real block_y(int y) = (y - (pad_blocks - 1)/2) * block_height;
115 bool via_block(int x, int y) {
116 return (x & 1) == 0 && (y & 1) == 0;
119 real via_hole = 13/1000 * 25.4; /* 13 mil drill */
120 real via_copper = 7/1000 * 25.4; /* 5.6 mil anulus */
122 for (int pad_y = 0; pad_y < pad_blocks; pad_y++) {
123 for (int pad_x = 0; pad_x < pad_blocks; pad_x++)
124 if (via_block(pad_x, pad_y)) {
125 pin_mm_clear_mask(block_x(pad_x), block_y(pad_y),
126 via_hole, via_hole + 2 * via_copper, pad_clearance, 0,
128 pad_mm_clear_mask_options(block_x(pad_x), block_y(pad_y),
129 block_width, block_height,
131 "GND", "GND","square,nopaste");
133 /* full square of metal */
134 pad_mm_clear_options(block_x(pad_x), block_y(pad_y),
135 block_width, block_height,
137 "GND", "GND","square,nopaste");
138 /* 1/4 full of solder paste */
139 pad_mm_clear_options(block_x(pad_x), block_y(pad_y),
140 block_width/2, block_height/2,
142 "GND", "GND","square");