//###########################################################################
//
// 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:
// Copyright (C) 2009-2023 Texas Instruments Incorporated - http://www.ti.com/
//
// Redistribution and use in source and binary forms, with or without 
// modification, are permitted provided that the following conditions 
// are met:
// 
//   Redistributions of source code must retain the above copyright 
//   notice, this list of conditions and the following disclaimer.
// 
//   Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the 
//   documentation and/or other materials provided with the   
//   distribution.
// 
//   Neither the name of Texas Instruments Incorporated nor the names of
//   its contributors may be used to endorse or promote products derived
//   from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// $
//###########################################################################

//
// 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
//

