//###########################################################################
//
// FILE:	Example_EPwmSetup.c
//
// TITLE:	EXAMPLE_EPWMSETUP_C EPWM Setup Example
//
//!  \addtogroup f2833x_example_list
//!  \section EXAMPLE_EPWMSETUP_C EPWM Setup (Example_EPwmSetup.c)
//!
//!  This file contains source for the ePWM initialization for the
//!  freq calculation module. EPWM1 is set to operate in up-down count
//!  mode at a frequency of 5KHz
//
//###########################################################################
// $TI Release: $
// $Release Date: $
// $Copyright:
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//
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// 
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// $
//###########################################################################

//
// Included Files
//
#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File
#include "Example_posspeed.h"   // Example specific Include file

//
// Defines
//
#if (CPU_FRQ_150MHZ)
    #define CPU_CLK   150e6
#endif
#if (CPU_FRQ_100MHZ)
    #define CPU_CLK   100e6
#endif

//
// 5kHz (300rpm) EPWM1 frequency. Frequency can be changed here
//
#define PWM_CLK   5e3 
#define SP        CPU_CLK/(2*PWM_CLK)
#define TBCTLVAL  0x200E      // up-down count, timebase=SYSCLKOUT

//
// initEpwm - 
//
void
initEpwm()
{
    EPwm1Regs.TBSTS.all=0;
    EPwm1Regs.TBPHS.half.TBPHS =0;
    EPwm1Regs.TBCTR=0;

    EPwm1Regs.CMPCTL.all=0x50;     // immediate mode for CMPA and CMPB
    EPwm1Regs.CMPA.half.CMPA=SP/2;
    EPwm1Regs.CMPB=0;

    //
    // CTR=CMPA when inc->EPWM1A=1, when dec->EPWM1A=0
    //
    EPwm1Regs.AQCTLA.all=0x60;
    
    EPwm1Regs.AQCTLB.all=0x09;     // CTR=PRD ->EPWM1B=1, CTR=0 ->EPWM1B=0
    EPwm1Regs.AQSFRC.all=0;
    EPwm1Regs.AQCSFRC.all=0;

    EPwm1Regs.TZSEL.all=0;
    EPwm1Regs.TZCTL.all=0;
    EPwm1Regs.TZEINT.all=0;
    EPwm1Regs.TZFLG.all=0;
    EPwm1Regs.TZCLR.all=0;
    EPwm1Regs.TZFRC.all=0;

    EPwm1Regs.ETSEL.all=0x0A;      // Interrupt on PRD
    EPwm1Regs.ETPS.all=1;
    EPwm1Regs.ETFLG.all=0;
    EPwm1Regs.ETCLR.all=0;
    EPwm1Regs.ETFRC.all=0;

    EPwm1Regs.PCCTL.all=0;

    EPwm1Regs.TBCTL.all=0x0010+TBCTLVAL; // Enable Timer
    EPwm1Regs.TBPRD=SP;
}

//
// End of File
//