CCS/LAUNCHXL-F28377S: SFO HRPWM

//
        // Sweep PeriodFine as a Q16 number from 0.2 - 0.999
        //
        for(PeriodFine = 0x3333; PeriodFine < 0xFFBF; PeriodFine++)
        {
            if(UpdateFine)
            {
                //
                // Because auto-conversion is enabled, the desired
                // fractional period must be written directly to the
                // TBPRDHR (or TBPRDHRM) register in Q16 format
                // (lower 8-bits are ignored)
                //
                // EPwm1Regs.TBPRDHR = PeriodFine;
                //
                // The hardware will automatically scale
                // the fractional period by the MEP_ScaleFactor
                // in the HRMSTEP register (which is updated
                // by the SFO calibration software).
                //
                // Hardware conversion:
                // MEP delay movement = ((TBPRDHR(15:0) >> 8) *  HRMSTEP(7:0) +
                //                       0x80) >> 8
                //
                for(i=1; i<PWM_CH; i++)
                {
                    (*ePWM[i]).TBPRDHR = PeriodFine; //In Q16 format
                }
            }
            else
            {
                //
                // No high-resolution movement on TBPRDHR.
                //
                for(i=1; i<PWM_CH; i++)
                {
                    (*ePWM[i]).TBPRDHR = 0;
                }
            }

            //
            // Call the scale factor optimizer lib function SFO(0)
            // periodically to track for any change due to temp/voltage.
            // This function generates MEP_ScaleFactor by running the
            // MEP calibration module in the HRPWM logic. This scale
            // factor can be used for all HRPWM channels. HRMSTEP
            // register is automatically updated by the SFO function.
            //
            status = SFO(); // in background, MEP calibration module
                            // continuously updates MEP_ScaleFactor

            if(status == SFO_ERROR)
            {
                error();   // SFO function returns 2 if an error occurs & # of
            }              // MEP steps/coarse step exceeds maximum of 255.
        } // end PeriodFine for loop