Revision 0:3052351a8da9, committed 2017-03-09

Comitter:

oguro

Date:

Thu Mar 09 02:29:54 2017 +0000

Commit message:

Square wave Fourier series;

Changed in this revision

diff -r 000000000000 -r 3052351a8da9 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Mar 09 02:29:54 2017 +0000
@@ -0,0 +1,81 @@
+#include "mbed.h"
+#include <math.h>
+int i=1,N=50,q=0;
+
+float wt=0;
+
+
+float aout1=0,aout2=0;
+AnalogOut aout(PA_4);
+AnalogIn V_adc(PB_1);
+float Vr_adc;
+Serial pc(USBTX,USBRX);
+
+DigitalOut myled(LED1);
+   
+Timer timer1; 
+
+     
+int main(){  
+  
+     pc.baud(128000);
+     const float freq = 10;//50
+     
+    timer1.start();
+
+    while(1) {
+        Vr_adc=V_adc.read();
+        if(Vr_adc<0.005f){
+              N=1;
+              }
+        if((Vr_adc>0.005f)&&(Vr_adc<=0.1f)){
+              N=2;
+              }
+       if((Vr_adc>0.1f)&&(Vr_adc<=0.2f)){
+              N=5;
+              }
+        if((Vr_adc>0.2f)&&(Vr_adc<=0.4f)){
+              N=10;
+              }
+       if((Vr_adc>0.4f)&&(Vr_adc<=0.6f)){
+              N=20;
+              }   
+       if((Vr_adc>0.6f)&&(Vr_adc<=0.8f)){
+              N=30;
+              }
+      if(Vr_adc>0.8f){
+              N=60;
+              }      
+        float s = timer1.read();
+        myled = ((int)s) % 2 == 0; /* LED output(0.5Hz) */
+        wt=fmodf(s * freq, 1) * 3.14159265359 * 2;
+        for(i=1;i<=2*N-1;i=i+2){
+        //aout2 = VDD/2 +2/VDD* (sin(wt)+sin(3*wt)/3+sin(5*wt)/5+.......)
+        if(i==0){
+          aout1=sin((i-1)*wt)/(i-1);  //if i==N i even
+          }
+          else{
+          aout1=sin(i*wt)/i;
+          }
+          aout2=aout2+aout1;
+       
+           }
+         
+          aout=0.1+(3.3/2+(2*3.3/3.14159265359)*aout2)/5; //VDD=3.3
+          aout2=0;
+          myled = !myled;
+          if(q>100000){
+           timer1.reset();
+           q=0;
+           }
+           q++;
+         //  if((q%100)==0){
+            pc.printf("%.3f \r" ,aout*10);
+         //  }
+
+    }
+  
+       
+       
+       
+}

diff -r 000000000000 -r 3052351a8da9 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Thu Mar 09 02:29:54 2017 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/abea610beb85
\ No newline at end of file