sine funtion

hi i forgot to mention the device

i  use picollo f28069

please give me some solution

cheers

suriya

i just tried spwm with the concept of increasing the pulse width and then decreasing it.

the triangular frequency is 20khz. therefore i had given period to be

#define period 2000

and took an array s[20] to be as given below with 20 samples with 10 samples for positive cycle and gave 10 samples as 0 for negative cycle.

   s[0]=0;
    s[1]=100;
    s[2]=200;
    s[3]=300;
    s[4]=400;
    s[5]=500;
    s[6]=400;
    s[7]=300;
    s[8]=200;
    s[9]=100;
    s[10]=0;
    for(i=11;i<=20;i++)
    s[i]=0;
  //=================================
  //    Forever LOOP
  //=================================
  // Just sit and loop forever:
  // No interrups needed in this example.
  // PWM pins can be observed with a scope.    

      for(;;)
    {
        for(j=0;j<20;j++)
         {
             duty_cycle_A=s[j];
            for(i=0;i<20;i++)
           {
             EPwm2Regs.CMPA.half.CMPA = duty_cycle_A;      // Add duty_cycle_A to watch window
               }
          }                                     
    }

}

the required sine frequency is 50 hz which is 20 msec

20 * 20= 400 samples. since the period is 1/20k=50 mu sec 50 mu *400 = 20 m sec

i expect (20m/50mu)=400 pulses per sample. for one particular sample the 400 pulses would have same width but the next 400 pulses would have a different pulse width

but i m not getting the required output

can anyone say what is the problem and say whether my understanding is right?