example_epwmsetup.c

DSP学习板上的例子程序包括 AD转换 CAN总线 SPI SCI

// TI File $Revision: /main/2 $
// Checkin $Date: April 18, 2005   10:08:18 $
// Modified by LSD_Hanbing to suit the LSD_EVM320F2801X, April 24,2007
//###########################################################################
//
// FILE:	Example_EpwmSetup.c
//
// TITLE:	Frequency measurement using EQEP peripheral
//
// DESCRIPTION:
//
// This file contains source for the ePWM initialization for the 
// freq calculation module
//
//###########################################################################
// Original Author: SD
//
// $TI Release: DSP280x, DSP2801x Header Files V1.41 $
// $Release Date: August 7th, 2006 $
//###########################################################################

#include "DSP280x_Device.h"     // DSP280x Headerfile Include File
#include "DSP280x_Examples.h"   // DSP280x Examples Include File
#include "Example_freqcal.h"    // Example specific include file


#define CPU_CLK   60e6
#define PWM_CLK   20e3
#define SP        CPU_CLK/(2*PWM_CLK)
#define TBCTLVAL  0x200E


void EPwmSetup()
{
	EPwm1Regs.TBSTS.all=0;
	EPwm1Regs.TBPHS.half.TBPHS=0;
	EPwm1Regs.TBCTR=0;

	EPwm1Regs.CMPCTL.all=0x60;
	EPwm1Regs.CMPA.half.CMPA =SP/2;
	EPwm1Regs.CMPB=0;
	
	EPwm1Regs.AQCTLA.all=0x60;
	EPwm1Regs.AQCTLB.all=0;
	EPwm1Regs.AQSFRC.all=0;
	EPwm1Regs.AQCSFRC.all=0;
	
	EPwm1Regs.DBCTL.all=0xb;
	EPwm1Regs.DBRED=0;
	EPwm1Regs.DBFED=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=9;
	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;

    EALLOW;
    SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC =1;
    EDIS;
}