Diff: main.cpp

Revision:

0:cc171456477d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Aug 05 17:49:57 2019 +0000
@@ -0,0 +1,47 @@
+#include "mbed.h"
+
+#define sqr(x) (x)*(x)
+#define abs(x)  (x)<0 ? -(x):(x)
+Serial pc(PA_2,PA_3);
+
+// sin(x)0 x- (x^3/3!)+(x^5/5!)-(x^7/7!)+ (x^9/9!)- (x^11/!)+...
+float mysin(float x)
+
+{
+    float sinx=x;
+    float term=x;
+    int   step=2;
+    int   sign=-1;
+    
+    do
+    {
+        term *= sqr(x)/(step*(step+1));
+        sinx += term * sign;
+        step += 2;
+        sign *= -1;
+    }
+    while (abs (term) >0.00001F);
+    
+    return sinx;
+}
+
+
+int main() {
+    
+ 
+    float x= 0;
+    
+    pc.baud(115200);
+    while(1)
+    {   
+        
+        pc.printf("#A%f\r\n",10*mysin(x));
+    
+        x=x+0.01F;
+        if (x > 6.28F) 
+        x=0;
+        
+        wait(0.1);
+    }
+
+}
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