28335 HRPWM中SFO优化时，占空比怎么用来设置CMPA:CMPAHR

只看该作者 · 2015-9-13 14:14

for(i=1;i<PWM_CH;i++)
            {
               CMPA_reg_val = ((long)DutyFine * (*ePWM[i]).TBPRD)>>15;
                  temp = ((long)DutyFine * (*ePWM[i]).TBPRD) ;
         temp = temp - ((long)CMPA_reg_val<<15);
         CMPAHR_reg_val = (temp*MEP_ScaleFactor[i])>>15;
         CMPAHR_reg_val = CMPAHR_reg_val << 8;
               CMPAHR_reg_val += 0x0180;

         // Example for a 32 bit write to CMPA:CMPAHR
         (*ePWM[i]).CMPA.all = ((long)CMPA_reg_val)<<16 | CMPAHR_reg_val;
               }
这段程序，没看懂，占空比怎么用，CMPA赋值也不太清楚