packages: add ufqfpn20 (stm32l tiny part)

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/packages/Makefile b/packages/Makefile
index 1fbdd52dbb39ad041032144618b280f963698269..1f55acdb076779031df313cb54ed98add3c8ce5d 100644 (file)
--- a/packages/Makefile
+++ b/packages/Makefile
@@ -90,6 +90,7 @@ FOOTPRINTS= \
        u-pdfn-8.fp \
        ufqfpn28.fp \
        ufqfpn24.fp \
+       ufqfpn20.fp \
        sot666.fp \
        sot323.fp \
        sod323.fp \

diff --git a/packages/ufqfpn20.5c b/packages/ufqfpn20.5c
new file mode 100644 (file)
index 0000000..2a8839a
--- /dev/null
+++ b/packages/ufqfpn20.5c
@@ -0,0 +1,158 @@
+/*
+ * Copyright © 2020 Keith Packard <keithp@keithp.com>
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+load "footprint.5c"
+import Footprint;
+
+Footprint::process_soldermask = 0.05;
+
+real pad_outside = 0.15;
+real pad_width = 0.70;
+real corner_pad_width = 0.50;
+real corner_pad_height = 0.30;
+real pad_height = 0.30;
+
+/* Required clearance between corner pads on the diagonal */
+real corner_diag_clearance = 0.40;
+
+/* horizontal/vertical size of corner cut out */
+#real corner_pad_notch = corner_diag_clearance / sqrt(2);
+real corner_pad_notch = 0.125;
+
+real corner_pad_minimum_height = pad_height - corner_pad_notch;
+real corner_pad_minimum_width = corner_pad_width - corner_pad_notch;
+
+real pad_spacing = 0.50;
+
+real package_width = 3;
+real package_height = 3;
+
+/* outer location of pad */
+
+real pad_x_off = (package_width/2 + pad_outside);
+real pad_y_off = (package_height/2 + pad_outside);
+
+real num_pad = 5;      /* per side */
+
+element_start("ufqfpn-20");
+
+real pad_off(int n) {
+       return pad_spacing * (n - (num_pad - 1) / 2);
+}
+
+real corner(int dx, int dy) {
+       real    x = dx * package_width / 2;
+       real    y = dy * package_height / 2;
+       real    len = 0.4;
+
+       line(x, y, x - dx * len, y);
+       line(x, y, x, y - dy * len);
+}
+
+/*
+corner(-1, -1);
+corner(1, -1);
+corner(-1, 1);
+corner(1, 1);
+*/
+
+real dot_off = .3;
+
+line(-package_width/2 - dot_off, -package_height/2 - dot_off,
+     -package_width/2 - dot_off, -package_height/2 - dot_off);
+
+/* rect(-package_width/2, -package_width/2, package_width, package_width); */
+
+for (int pad = 0; pad < num_pad; pad++) {
+       real pw = pad_width;
+       real ph = pad_height;
+       real pwa = 0;
+       real pha = 0;
+
+       int     nstep = 0;
+
+       if (pad == 0 || pad == num_pad-1)
+               nstep = 3;
+
+       for (int s = 0; s <= nstep; s++) {
+
+               real    pad_x, pad_y, pad_w, pad_h;
+
+               if (nstep != 0) {
+                       real    ratio_a = s / nstep;
+                       real    ratio_b = 1 - ratio_a;
+
+                       pad_x = 0;
+                       if (pad == 0) {
+                               pad_y = -pad_height / 2 * ratio_b + ((-pad_height / 2) + corner_pad_notch) * ratio_a;
+                       } else {
+                               pad_y = -pad_height / 2;
+                       }
+                       pad_w = corner_pad_minimum_width * ratio_b + corner_pad_width * ratio_a;
+
+                       pad_h = pad_height * ratio_b + corner_pad_minimum_height * ratio_a;
+
+                       /* Make sure we don't violate the process minimums */
+                       if (pad_h < process_trace)
+                               pad_h = process_trace;
+
+               } else {
+                       pad_x = 0;
+                       pad_y = -pad_height / 2;
+                       pad_w = pad_width;
+                       pad_h = pad_height;
+               }
+
+               /* left (1-6) */
+               pad_mm(-pad_x_off + pad_x + pad_w / 2,
+                      pad_off(pad) + pad_y + pad_h / 2,
+                      pad_w,
+                      pad_h,
+                      sprintf("%d", pad + 1),
+                      sprintf("%d", pad + 1));
+
+               /* bottom (7-12) */
+
+               pad_mm(pad_off(pad) + pad_y + pad_h / 2,
+                      pad_y_off + pad_x - pad_w / 2,
+                      pad_h,
+                      pad_w,
+                      sprintf("%d", pad + num_pad + 1),
+                      sprintf("%d", pad + num_pad + 1));
+
+               /* right side (13-18) */
+
+               pad_mm(pad_x_off - pad_x - pad_w / 2,
+                      -pad_off(pad) - pad_y - pad_h / 2,
+                      pad_w,
+                      pad_h,
+                      sprintf("%d", pad + num_pad * 2 + 1),
+                      sprintf("%d", pad + num_pad * 2 + 1));
+
+               /* top (19-24) */
+
+               pad_mm(-pad_off(pad) - pad_y - pad_h / 2,
+                      -pad_y_off - pad_x + pad_w / 2,
+                      pad_h,
+                      pad_w,
+                      sprintf("%d", pad + num_pad * 3 + 1),
+                      sprintf("%d", pad + num_pad * 3 + 1));
+       }
+
+}
+
+element_end();