1 files changed, 159 insertions, 0 deletions
diff --git a/glcd/fastMath.c b/glcd/fastMath.c
new file mode 100644
index 00000000..26ae0d3f
--- /dev/null
+++ b/glcd/fastMath.c
@@ -0,0 +1,159 @@
+/*
+ * fastMath.c
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation, either version 3 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 Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Created on: 07.09.2011
+ *      Author: Roland Domke
+ *   Copyright: 2011 Roland Domke
+ */
+
+
+//achtung wird im RAM abgelegt!
+float sintable[91]  = {
+		0
+		,0.017452406
+		,0.034899497
+		,0.052335956
+		,0.069756474
+		,0.087155743
+		,0.104528463
+		,0.121869343
+		,0.139173101
+		,0.156434465
+		,0.173648178
+		,0.190808995
+		,0.207911691
+		,0.224951054
+		,0.241921896
+		,0.258819045
+		,0.275637356
+		,0.292371705
+		,0.309016994
+		,0.325568154
+		,0.342020143
+		,0.35836795
+		,0.374606593
+		,0.390731128
+		,0.406736643
+		,0.422618262
+		,0.438371147
+		,0.4539905
+		,0.469471563
+		,0.48480962
+		,0.5
+		,0.515038075
+		,0.529919264
+		,0.544639035
+		,0.559192903
+		,0.573576436
+		,0.587785252
+		,0.601815023
+		,0.615661475
+		,0.629320391
+		,0.64278761
+		,0.656059029
+		,0.669130606
+		,0.68199836
+		,0.69465837
+		,0.707106781
+		,0.7193398
+		,0.731353702
+		,0.743144825
+		,0.75470958
+		,0.766044443
+		,0.777145961
+		,0.788010754
+		,0.79863551
+		,0.809016994
+		,0.819152044
+		,0.829037573
+		,0.838670568
+		,0.848048096
+		,0.857167301
+		,0.866025404
+		,0.874619707
+		,0.882947593
+		,0.891006524
+		,0.898794046
+		,0.906307787
+		,0.913545458
+		,0.920504853
+		,0.927183855
+		,0.933580426
+		,0.939692621
+		,0.945518576
+		,0.951056516
+		,0.956304756
+		,0.961261696
+		,0.965925826
+		,0.970295726
+		,0.974370065
+		,0.978147601
+		,0.981627183
+		,0.984807753
+		,0.987688341
+		,0.990268069
+		,0.992546152
+		,0.994521895
+		,0.996194698
+		,0.99756405
+		,0.998629535
+		,0.999390827
+		,0.999847695
+		,1
+
+};
+
+float getSin(unsigned int degree)
+{
+	degree = degree % 360;
+	if(degree <= 90)
+	{
+		return sintable[degree];
+	}
+	else if(degree <= 180)
+	{
+		return sintable[180-degree];
+	}
+	else if(degree <= 270)
+	{
+		return sintable[degree-180]*(-1.0);
+	}
+	else
+	{
+		return sintable[360-degree]*(-1.0);
+	}
+}
+
+double getCos(unsigned int degree)
+{
+	degree = degree % 360;
+	return getSin(degree+90);
+}
+
+/* signum function */
+char sgn(char x){
+  return (x > 0) ? 1 : (x < 0) ? -1 : 0;
+}
+
+unsigned char max(unsigned char a, unsigned char b)
+{
+	return (a<b) ? b : a;
+}
+
+unsigned char min (unsigned char a, unsigned char b)
+{
+	return (a<b) ? a : b;
+}