TMS320F28379D: 两路pwm设置死区为高电平互补有效

dou yue

Part Number: TMS320F28379D

请教

想得到epwm1、epwm2都是带死区的高电平互补有效，将epwm1和epwm2的极性都设置为HIC时（如上图），输出的pwm波有小台阶，如下图，小台阶表示什么，是我哪设置的不对吗？

我试了一下， epwm1设置为 EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_LOC; epwm2设置为 EPwm2Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; 波形很好，没有小台阶，如下图

4 年多前

0 Green Deng 4 年多前

TI__Guru** 101655 points

额，比较好奇你在代码中为什么在

EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC;

后面又加了一句

EPwm1Regs.DBCTL.bit.POLSEL = 0;

对寄存器两次赋值可能会有问题，不知道你的实验2是不是也是这样写寄存器的？

0 dou yue 4 年多前回复 Green Deng

谢谢您的回复，不好意思，贴错代码了，两个设置都没有EPwm1Regs.DBCTL.bit.POLSEL = 0;这一行

两组设置

① EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; EPwm2Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC;

②EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_LOC; EPwm2Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC;

其余设置均相同，不知道为什么①波形有个小台阶，而②波形正常

0 Green Deng 4 年多前回复 dou yue

TI__Guru** 101655 points

有没有测试过PWM1和PWM3搭配的情况下会有同样问题吗？

没看到过相关资料说明不能两个同时设置为DB_ACTV_HIC的，而且似乎运行结果的波形也没有出现死区。

0 dou yue 4 年多前回复 Green Deng

#include "F28x_Project.h"

Uint32 EPwm1TimerIntCount;
Uint32 EPwm3TimerIntCount;

void InitEPwm1Example(void);
void InitEPwm3Example(void);


void main(void)
{

    InitSysCtrl();


    CpuSysRegs.PCLKCR2.bit.EPWM1=1;
    CpuSysRegs.PCLKCR2.bit.EPWM3=1;

    InitEPwm1Gpio();
    InitEPwm3Gpio();


    DINT;

    InitPieCtrl();

    IER = 0x0000;
    IFR = 0x0000;

    InitPieVectTable();
    EALLOW;
    EDIS;

    EALLOW;
    CpuSysRegs.PCLKCR0.bit.TBCLKSYNC =0;
    EDIS;

    InitEPwm1Example();
    InitEPwm3Example();


    EALLOW;
    CpuSysRegs.PCLKCR0.bit.TBCLKSYNC =1;
    EDIS;

 
    EPwm1TimerIntCount = 0;
    EPwm3TimerIntCount = 0;

    EINT;  // Enable Global interrupt INTM 
    ERTM;  // Enable Global realtime interrupt DBGM 

  
        for(;;)
        {
            asm ("          NOP");
        }
    }


void InitEPwm1Example()
{

    EPwm1Regs.TBPRD = 140;                  // Set timer period
    EPwm1Regs.TBPHS.bit.TBPHS = 0x0000;           // Phase is 0
    EPwm1Regs.TBCTR = 0x0000;                     // Clear counter

    EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; 
    EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;        // Disable phase loading
    EPwm1Regs.TBCTL.bit.CLKDIV = 0;
    EPwm1Regs.TBCTL.bit.HSPCLKDIV =1;    // Clock ratio to SYSCLKOUT


    EPwm1Regs.TBSTS.all = 0;

    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;


    EPwm1Regs.CMPA.bit.CMPA = 70;


    //
    // Set actions
    //
    EPwm1Regs.AQCTLA.bit.CAU =AQ_SET;           
    EPwm1Regs.AQCTLA.bit.CAD =AQ_CLEAR;

    EPwm1Regs.AQCTLB.bit.CAU =AQ_CLEAR;
    EPwm1Regs.AQCTLB.bit.CAD =AQ_SET;

    EPwm1Regs.AQSFRC.all = 0;
    EPwm1Regs.AQCSFRC.all = 0;


    EPwm1Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE;
    EPwm1Regs.DBCTL.bit.POLSEL =  DB_ACTV_HIC;

    EPwm1Regs.DBCTL.bit.IN_MODE = DBA_ALL;

    EPwm1Regs.DBRED.bit.DBRED  =10;
    EPwm1Regs.DBFED.bit.DBFED  =10;

}

void InitEPwm3Example()
{

    EPwm3Regs.TBCTL.bit.CLKDIV = 0;
    EPwm3Regs.TBCTL.bit.HSPCLKDIV =1;    // Clock ratio to SYSCLKOUT'
    EPwm3Regs.TBCTL.bit.CTRMODE = 2; 
    EPwm3Regs.TBCTL.bit.PHSEN = 0;        // Disable phase loading

    EPwm3Regs.TBSTS.all = 0;
    EPwm3Regs.TBPHS.bit.TBPHS = 0;           // Phase is 0
    EPwm3Regs.TBCTR = 0;                     // Clear counter
    EPwm3Regs.TBPRD = 140;                  // Set timer period
    EPwm3Regs.TBSTS.all = 0;

    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;

    EPwm3Regs.CMPA.bit.CMPA = 70;

    EPwm3Regs.AQCTLA.bit.CAU =AQ_SET;           
    EPwm3Regs.AQCTLA.bit.CAD =AQ_CLEAR;

    EPwm3Regs.AQCTLB.bit.CAU =AQ_CLEAR;
    EPwm3Regs.AQCTLB.bit.CAD =AQ_SET;

    EPwm3Regs.AQSFRC.all = 0;
    EPwm3Regs.AQCSFRC.all = 0;



    EPwm3Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE;
    EPwm3Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC;
    EPwm3Regs.DBCTL.bit.IN_MODE = DBA_ALL;

    EPwm3Regs.DBRED.bit.DBRED  = 10;
    EPwm3Regs.DBFED.bit.DBFED  = 10;

}