Diff: main.cpp

Revision:

0:7e84644181bb

Child:

1:505435f49bf9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Dec 12 07:50:36 2016 +0000
@@ -0,0 +1,90 @@
+#include "mbed.h"
+
+//PWM
+PwmOut pwm(p23);
+
+//Ticker
+Ticker timer;
+
+//Timer
+//Timer ta;
+
+//Digital Out
+DigitalOut test(p20);
+
+//Cos Wave
+float coswave[256];
+
+//User set Wave Paramater
+int sample_dt          = 100;      //microsec 10kHz
+float freq             = 200;      //Hz
+float level            = 1;      //min=0 max=1
+
+
+float period           = 1000000*1/freq;  //microSec      
+float n                = 0;
+float n_sample         = 0;        //The maximum number of sampling points in the signal
+float tend             = 0;        //The remainder of sampling points in the signal
+float tstart           = 0;        //start offset of sampling time
+float t_samplepoint    = 0;           
+float table_dt         = period/256;                                            
+float n_samplepoint    = 0;
+float rem_samplepoint  = 0;
+float v_samplepoint    = 0;
+float signal           = 0;
+
+int pwidth = 0;
+
+//Signal Culcurate
+
+
+//Signal type parameter
+void signal_culc(){
+    
+ //RESP section
+        n_sample = (period - tstart) / sample_dt;
+        tend = fmod((period - tstart) , sample_dt);
+
+        t_samplepoint = tstart + sample_dt * n; //time of sampling point
+        n_samplepoint = t_samplepoint / table_dt;
+        rem_samplepoint = fmod(t_samplepoint , table_dt);
+        v_samplepoint = level*(coswave[(int)n_samplepoint]-(rem_samplepoint/table_dt)*(coswave[(int)n_samplepoint]-coswave[(int)n_samplepoint+1]));
+        signal = v_samplepoint+0.5;                 //0-1 -> 0V-3.3V
+        if(n == (int)n_sample) {
+            n =0;
+            tstart = sample_dt - tend;
+            }      
+        else {
+            n++;         
+            }
+             
+//PWM Output Pulse width
+        pwidth = signal * sample_dt;  
+        
+        pwm.pulsewidth_us(pwidth);   
+}
+
+void attime(){  
+    signal_culc();
+}
+
+
+int main() {
+
+//Make Cos wave
+    int i;
+    for(i=0;i<=255;i++){                                                        //256->255
+        coswave[i]=0.5*(cos(2.0*3.1415*i/256));                                 //256->256       
+    }
+    i = 0;
+
+    pwm.period_us(sample_dt);                //Pulse_cycle = 100usec = 10kHz
+    
+    int j;
+    j = sample_dt;
+    timer.attach_us(&attime,j);
+
+    while(1) {
+
+    }
+}