DSP28335 epwm使用

PWM1,2,3的A,B,C 6个通道初始化

#include "pwm.h"

//PRD:自动重装值
//CMPA：通道A比较值
//CMPB:通道B比较值
void InitEPwm123(int16 PRD)
{
InitEPwmGpio(); //初始化EPWM1，2，3的GPIO
Epwm1_Init(PRD);
Epwm2_Init(PRD);
Epwm3_Init(PRD);
}

//设置EPWM1模块
void Epwm1_Init(int16 PRD)
{
EPwm1Regs.TBPRD = PRD ; //设置周期
EPwm1Regs.CMPA.half.CMPA = 0; //设置占空比
EPwm1Regs.CMPB = 0;

// Setup TBCLK
EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; //递增模式
//EPwm1Regs.TBCTL.bit.CTRMODE =TB_COUNT_UPDOWN; //增减模式
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW; // Disable phase loading
EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE; //
EPwm1Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0
EPwm1Regs.TBCTR = 0x0000; // Clear counter
EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT
EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1; // TBCLK = SYSCLKOUT/(HSPCLKDIV*CLKDIV)

// Setup shadow register load on ZERO
EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;
EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;

// 递增模式的动作
EPwm1Regs.AQCTLA.bit.ZRO = AQ_SET; // Set PWM1A on Zero
EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR; // Clear PWM1A on event A, up count
EPwm1Regs.AQCTLB.bit.ZRO = AQ_SET; // Set PWM1B on Zero
EPwm1Regs.AQCTLB.bit.CBU = AQ_CLEAR; // Clear PWM1B on event B, up count
}

void Epwm2_Init(int16 PRD)
{
EPwm2Regs.TBPRD = PRD ; //设置周期
EPwm2Regs.CMPA.half.CMPA = 0; //设置占空比
EPwm2Regs.CMPB = 0;
// Setup TBCLK
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP;//; // Count up
EPwm2Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
EPwm2Regs.TBCTL.bit.PRDLD = TB_SHADOW; // Disable phase loading
EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE; //
EPwm2Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0
EPwm2Regs.TBCTR = 0x0000; // Clear counter
EPwm2Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT
EPwm2Regs.TBCTL.bit.CLKDIV = TB_DIV1; // TBCLK = SYSCLKOUT/(HSPCLKDIV*CLKDIV)

// Setup shadow register load on ZERO
EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;
EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;

// Set actions
EPwm2Regs.AQCTLA.bit.ZRO = AQ_SET; // Set PWM1A on Zero
EPwm2Regs.AQCTLA.bit.CAU = AQ_CLEAR; // Clear PWM1A on event A, up count
EPwm2Regs.AQCTLB.bit.ZRO = AQ_SET; // Set PWM1B on Zero
EPwm2Regs.AQCTLB.bit.CBU = AQ_CLEAR; // Clear PWM1B on event B, up count
}

void Epwm3_Init(int16 PRD)
{
EPwm3Regs.TBPRD = PRD ; //设置周期
EPwm3Regs.CMPA.half.CMPA = 0; //设置占空比
EPwm3Regs.CMPB = 0;
// Setup TBCLK
EPwm3Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP;//; // Count up
EPwm3Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
EPwm3Regs.TBCTL.bit.PRDLD = TB_SHADOW; // Disable phase loading
EPwm3Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE; //
EPwm3Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0
EPwm3Regs.TBCTR = 0x0000; // Clear counter
EPwm3Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT
EPwm3Regs.TBCTL.bit.CLKDIV = TB_DIV1; // TBCLK = SYSCLKOUT/(HSPCLKDIV*CLKDIV)

// Setup shadow register load on ZERO
EPwm3Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm3Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm3Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;
EPwm3Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;

// Set actions
EPwm3Regs.AQCTLA.bit.ZRO = AQ_SET; // Set PWM1A on Zero
EPwm3Regs.AQCTLA.bit.CAU = AQ_CLEAR; // Clear PWM1A on event A, up count
EPwm3Regs.AQCTLB.bit.ZRO = AQ_SET; // Set PWM1B on Zero
EPwm3Regs.AQCTLB.bit.CBU = AQ_CLEAR; // Clear PWM1B on event B, up count

}

头文件

#ifndef PWM_H_
#define PWM_H_
#include "main.h"
#if (CPU_FRQ_150MHZ)
#define CPU_CLK 150e6
#endif
#if (CPU_FRQ_100MHZ)
#define CPU_CLK 100e6
#endif
#define PWM_FREQ 10e3 // 10KHZ If diff freq. desired, change freq here.
//#define SP CPU_CLK/(2*PWM_CLK) //上下计数模式
#define SP ( (CPU_CLK/PWM_FREQ)-1 ) //向上计数模式的自动重装值 10Khz的PWM波

#define SP_UPDOWN (CPU_CLK/(2*PWM_FREQ)) //向上计数模式的自动重装值

// Configure the period for each timer
#define EPWM1_TIMER_TBPRD SP // Period register
#define EPWM1_MAX_CMPA SP-10
#define EPWM1_MIN_CMPA 10
#define EPWM1_MAX_CMPB SP-10
#define EPWM1_MIN_CMPB 10

#define EPWM2_TIMER_TBPRD SP // Period register
#define EPWM2_MAX_CMPA SP-10
#define EPWM2_MIN_CMPA 10
#define EPWM2_MAX_CMPB SP-10
#define EPWM2_MIN_CMPB 10

#define EPWM3_TIMER_TBPRD SP // Period register
#define EPWM3_MAX_CMPA SP-10
#define EPWM3_MIN_CMPA 10
#define EPWM3_MAX_CMPB SP-10
#define EPWM3_MIN_CMPB 10

#define Set_EPWM1A(Val) EPwm1Regs.CMPA.half.CMPA = Val //设置占空比
#define Set_EPWM1B(Val) EPwm1Regs.CMPB = Val //设置占空比
#define Set_EPWM2A(Val) EPwm2Regs.CMPA.half.CMPA = Val //设置占空比
#define Set_EPWM2B(Val) EPwm2Regs.CMPB = Val //设置占空比
#define Set_EPWM3A(Val) EPwm3Regs.CMPA.half.CMPA = Val //设置占空比
#define Set_EPWM3B(Val) EPwm3Regs.CMPB = Val //设置占空比

void InitEPwm123(int16 PRD);
void Epwm1_Init(int16 PRD);
void Epwm2_Init(int16 PRD);
void Epwm3_Init(int16 PRD);

#endif /* PWM_H_ */

main函数中要到的函数

InitEPwm123(SP); //SP宏定义为自动重装值，根据不同的PWM波频率进行调整
Set_EPWM1A(SP/4); //设置为不同的占空比
Set_EPWM1B(SP*7/8);
Set_EPWM2A(SP/5);
Set_EPWM2B(SP/4);
Set_EPWM3A(SP/3);
Set_EPWM3B(SP/2);

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