F28035这段代码什么意思？求大神解答

只看该作者 · 2016-3-13 15:07

void update_compare(EPWM_INFO *epwm_info)
{
// Every 10'th interrupt, change the CMPA/CMPB values
if(epwm_info->EPwmTimerIntCount == 10)
{
   epwm_info->EPwmTimerIntCount = 0;

   // If we were increasing CMPA, check to see if
   // we reached the max value.  If not, increase CMPA
   // else, change directions and decrease CMPA
   if(epwm_info->EPwm_CMPA_Direction == EPWM_CMP_UP)
   {
         if(epwm_info->EPwmRegHandle->CMPA.half.CMPA < epwm_info->EPwmMaxCMPA)
         {
            epwm_info->EPwmRegHandle->CMPA.half.CMPA++;
         }
         else
         {
            epwm_info->EPwm_CMPA_Direction = EPWM_CMP_DOWN;
            epwm_info->EPwmRegHandle->CMPA.half.CMPA--;
         }
   }

   // If we were decreasing CMPA, check to see if
   // we reached the min value.  If not, decrease CMPA
   // else, change directions and increase CMPA
   else
   {
         if(epwm_info->EPwmRegHandle->CMPA.half.CMPA == epwm_info->EPwmMinCMPA)
         {
            epwm_info->EPwm_CMPA_Direction = EPWM_CMP_UP;
            epwm_info->EPwmRegHandle->CMPA.half.CMPA++;
         }
         else
         {
            epwm_info->EPwmRegHandle->CMPA.half.CMPA--;
         }
   }

   // If we were increasing CMPB, check to see if
   // we reached the max value.  If not, increase CMPB
   // else, change directions and decrease CMPB
   if(epwm_info->EPwm_CMPB_Direction == EPWM_CMP_UP)
   {
         if(epwm_info->EPwmRegHandle->CMPB < epwm_info->EPwmMaxCMPB)
         {
            epwm_info->EPwmRegHandle->CMPB++;
         }
         else
         {
            epwm_info->EPwm_CMPB_Direction = EPWM_CMP_DOWN;
            epwm_info->EPwmRegHandle->CMPB--;
         }
   }

   // If we were decreasing CMPB, check to see if
   // we reached the min value.  If not, decrease CMPB
   // else, change directions and increase CMPB

   else
   {
         if(epwm_info->EPwmRegHandle->CMPB == epwm_info->EPwmMinCMPB)
         {
            epwm_info->EPwm_CMPB_Direction = EPWM_CMP_UP;
            epwm_info->EPwmRegHandle->CMPB++;
         }
         else
         {
            epwm_info->EPwmRegHandle->CMPB--;
         }
   }
}
else
{
   epwm_info->EPwmTimerIntCount++;
}

return;
}