From fe2670a4cb87d1f6e481890e825a4cc4f875d1d1 Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Sun, 27 Mar 2016 19:52:39 -0700 Subject: [PATCH] Fix weird corners on ufqfpn28 These have a hack to make the corners step to approximate a diagonal line, but they were being drawn wrong, leaving too little space between the corner and adjacent pads. Signed-off-by: Keith Packard --- packages/ufqfpn28.5c | 86 ++++++++++++++++++++++++++++---------------- 1 file changed, 56 insertions(+), 30 deletions(-) diff --git a/packages/ufqfpn28.5c b/packages/ufqfpn28.5c index c1b15ac..5a060c8 100644 --- a/packages/ufqfpn28.5c +++ b/packages/ufqfpn28.5c @@ -21,17 +21,32 @@ import Footprint; real pad_width = 0.55; real corner_pad_width = 0.50; real pad_height = 0.30; -real corner_pad_notch = 0.12; + +/* Required clearance between corner pads on the diagonal */ +real corner_diag_clearance = 0.21; + +/* horizontal/vertical size of corner cut out */ +#real corner_pad_notch = corner_diag_clearance / sqrt(2); +real corner_pad_notch = 0.15; + +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 pad_x_off = 3.20 / 2; -real pad_y_off = 3.20 / 2; +/* outer location of pad */ + +real pad_x_off = (3.30 + 2 * 0.5) / 2; +real pad_y_off = (3.30 + 2 * 0.5) / 2; real package_width = 4; real package_height = 4; real num_pad = 7; /* per side */ +/* our magic corner pads appear too narrow */ +override("pad trace"); + element_start("ufqfpn-28"); real pad_off(int n) { @@ -47,15 +62,17 @@ real corner(int dx, int dy) { 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); +line(-package_width/2 - dot_off, -package_height/2 - dot_off, + -package_width/2 - dot_off, -package_height/2 - dot_off); for (int pad = 0; pad < num_pad; pad++) { real pw = pad_width; @@ -69,51 +86,60 @@ for (int pad = 0; pad < num_pad; pad++) { nstep = 4; for (int s = 0; s <= nstep; s++) { - if (nstep != 0) { - real step = (corner_pad_notch) / nstep; - pw = corner_pad_width - (nstep - s) * step; - ph = pad_height - s * step*2/3; + real pad_x, pad_y, pad_w, pad_h; - pwa = pad_width - pw; - - pha = pad_height - ph; - if (pad != 0) - pha = -pha; + if (nstep != 0) { + real ratio = s / nstep; + + pad_x = 0; + if (pad == 0) { + pad_y = -pad_height / 2 * (1-ratio) + ((-pad_height / 2) + corner_pad_notch) * ratio; + } else { + pad_y = -pad_height / 2; + } + pad_w = corner_pad_minimum_width * (1-ratio) + corner_pad_width * ratio; + + pad_h = pad_height * (1 - ratio) + corner_pad_minimum_height * ratio; + } else { + pad_x = 0; + pad_y = -pad_height / 2; + pad_w = pad_width; + pad_h = pad_height; } /* left (1-7) */ - pad_mm(-pad_x_off - pw / 2 - pwa, - pad_off(pad) + pha, - pw, - ph, + 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 (8-14) */ - pad_mm(pad_off(pad) + pha, - pad_y_off + pw / 2 + pwa, - ph, - pw, + 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 + 8), sprintf("%d", pad + 8)); /* right side (15-21) */ - pad_mm(pad_x_off + pw / 2 + pwa, - -pad_off(pad) - pha, - pw, - ph, + 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 + 15), sprintf("%d", pad + 15)); /* top (22-28) */ - pad_mm(-pad_off(pad) - pha, - -pad_y_off - pw / 2 - pwa, - ph, - pw, + 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 + 22), sprintf("%d", pad + 22)); } -- 2.30.2