Diff: sin.cpp

Revision:

0:1c98216d18eb

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sin.cpp	Sat Feb 15 06:09:34 2014 +0000
@@ -0,0 +1,46 @@
+#include "mbed.h"
+AnalogOut DA(PTE30);
+//AnalogIn AD(PTB1);
+
+Serial pc(USBTX, USBRX); // tx, rx
+
+    float D2A;
+
+    
+    float sineTable[] = {0, 0.01745, 0.0349, 0.05234, 0.06976, 0.08716, 0.10453, 0.12187, 0.13917, 0.15643, 0.17365, 0.19081, 0.20791, 0.22495, 0.24192, 0.25882, 0.27564, 0.29237, 0.30902, 0.32557, 0.34202, 0.35837, 0.37461, 0.39073, 0.40674, 0.42262, 0.43837, 0.45399, 0.46947, 0.48481, 0.5, 0.51504, 0.52992, 0.54464, 0.55919, 0.57358, 0.58779, 0.60182, 0.61566, 0.62932, 0.64279, 0.65606, 0.66913, 0.682, 0.69466, 0.70711, 0.71934, 0.73135, 0.74314, 0.75471, 0.76604, 0.77715, 0.78801, 0.79864, 0.80902, 0.81915, 0.82904, 0.83867, 0.84805, 0.85717, 0.86603, 0.87462, 0.88295, 0.89101, 0.89879, 0.90631, 0.91355, 0.9205, 0.92718, 0.93358, 0.93969, 0.94552, 0.95106, 0.9563, 0.96126, 0.96593, 0.9703, 0.97437, 0.97815, 0.98163, 0.98481, 0.98769, 0.99027, 0.99255, 0.99452, 0.99619, 0.99756, 0.99863, 0.99939, 0.99985, 1}; // 0 to 90 degree
+    int TableLength = sizeof(sineTable)/sizeof(sineTable[0]);
+
+int main(void) {
+    //pc.printf("T-length=%d\n",TableLength);
+    
+    //Timer t;
+        
+    while(1){
+        //t.start();
+        for (int i=0; i<360; i++) {
+            if(i<91){
+                D2A = sineTable[i];
+                }
+            else if(i<181){
+                D2A = sineTable[181-i];
+                }
+            else if(i<271){
+                D2A = - sineTable[i-181];
+                }
+            else{
+                D2A = - sineTable[360-i];
+                }
+            
+            D2A = 0.5* (D2A + 1.0);
+            
+            DA.write(D2A);
+            wait(0.01);
+            pc.printf("%f ",D2A);
+            
+              
+        }
+        
+        //t.stop();
+        //pc.printf("The time taken was %f seconds\n", t.read());
+    }
+}
\ No newline at end of file