TMS320F280049: EPWM1和EPWM2发出的PWM波形不同步

TMS320F280049工作频率是100MHZ,EPWM1和EPWM2初始化如下:

看图片发现PWM1，黄色波形下降沿是是同步的，PWM2,PWM3图片也就是黄色波形的上升沿是不同步的，相差25us的样子。不知道为什么会一边同步一边不同步？

void EPWM1_Init(void)
{

EPwm1Regs.TBPRD = 2500-1; // 设定定时器周期
EPwm1Regs.TBPHS.bit.TBPHS = 0x0000; // 初始化相位
EPwm1Regs.TBCTR = 0x0000; // 初始化（清空）TB计数器

EPwm1Regs.CMPA.bit.CMPA = 0; // 设定高边值
EPwm1Regs.CMPB.bit.CMPB = 0; // 设定低边值

EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; //设置TB计数器为增减计数模式
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // 关闭相位载入
EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO; //关闭各PWM间的同步
EPwm1Regs.TBCTL.bit.PHSDIR = TB_UP;
EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // 调节本值可以设置TB速率，详见开发文档
EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1; // 调节本值可以设置TB速率，详见开发文档
EPwm1Regs.TBCTL.bit.FREE_SOFT = 0x03; //不停止，free-run 模式
EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW;

EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; //打开CC子模块下的影子寄存器A
EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // Load on Zero
EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;

// 设定事件触发结果，当CMPx == TBCTR时该如何动作，此处需要高边A和低边B的动作随着TB增减而相反
EPwm1Regs.AQCTLA.bit.CAU = AQ_SET;
EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR;
EPwm1Regs.AQCTLB.bit.CBU = AQ_NO_ACTION;
EPwm1Regs.AQCTLB.bit.CBD = AQ_NO_ACTION;

//死区控制
EPwm1Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; //0x3 MODE2 AHC high level delay
EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_LOC; //0x1
EPwm1Regs.DBCTL.bit.IN_MODE = DBA_ALL; //死去输入控制模式
EPwm1Regs.DBRED.all = 120; // 120上升沿延时 0us 0个(15MHz) 注意：只有10位，最大1023
EPwm1Regs.DBFED.all = 120; // 120下降沿延时 0us (15MHz) 注意：只有10位，最大1023

EPwm1Regs.ETSEL.bit.SOCAEN = ON; // 打开ePWM1的SOCA脉冲
EPwm1Regs.ETSEL.bit.SOCASEL = ET_CTR_ZERO; // TB计数器等予0时触发事件//TB计数器等予周期时触发事件
EPwm1Regs.ETPS.bit.SOCAPRD = 0x01; // 在第一次事件时生成脉冲

EALLOW;

EPwm1Regs.TZCTL.bit.TZA = TZ_FORCE_HI; // EPWMA会被强制置高

EPwm1Regs.TZCTL.bit.TZB = TZ_FORCE_HI; // EPWMB会被强制置高

EPwm1Regs.TZFRC.bit.OST=1;

EDIS;
}

void EPWM2_Init(void)
{

EPwm2Regs.TBPRD = 2500-1 // 设定定时器周期
EPwm2Regs.TBPHS.bit.TBPHS = 0x0000; // 初始化相位
EPwm2Regs.TBCTR = 0x0000; // 初始化（清空）TB计数器

EPwm2Regs.CMPA.bit.CMPA = 0; // 设定高边值
EPwm2Regs.CMPB.bit.CMPB = 0; // 设定低边值

EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; //设置TB计数器为增减计数模式
EPwm2Regs.TBCTL.bit.PHSEN = TB_ENABLE; // 关闭相位载入
EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; //关闭各PWM间的同步
EPwm2Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // 调节本值可以设置TB速率，详见开发文档
EPwm2Regs.TBCTL.bit.CLKDIV = TB_DIV1; // 调节本值可以设置TB速率，详见开发文档
EPwm2Regs.TBCTL.bit.FREE_SOFT = 0x03; //不停止，free-run 模式
EPwm2Regs.TBCTL.bit.PHSDIR=TB_UP;
EPwm2Regs.TBCTL.bit.PRDLD =TB_SHADOW;

EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; //打开CC子模块下的影子寄存器A
EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // Load on Zero
EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;

// 设定事件触发结果，当CMPx == TBCTR时该如何动作，此处需要高边A和低边B的动作随着TB增减而相反
EPwm2Regs.AQCTLA.bit.CAU = AQ_SET;
EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR;
EPwm2Regs.AQCTLB.bit.CBU = AQ_NO_ACTION;
EPwm2Regs.AQCTLB.bit.CBD = AQ_NO_ACTION;

//死区控制
EPwm2Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; //0x3 MODE2 AHC high level delay
EPwm2Regs.DBCTL.bit.POLSEL = DB_ACTV_LOC; //0x1
EPwm2Regs.DBCTL.bit.IN_MODE = DBA_ALL;//DBA_ALL;
EPwm2Regs.DBRED.all = 120; //120 上升沿延时 0us 0个(15MHz) 注意：只有10位，最大1023
EPwm2Regs.DBFED.all = 120; //120 下降沿延时 0us (15MHz) 注意：只有10位，最大1023

EALLOW;

EPwm2Regs.TZCTL.bit.TZA = TZ_FORCE_HI; // EPWMA会被强制置高

EPwm2Regs.TZCTL.bit.TZB = TZ_FORCE_HI; // EPWMB会被强制置高

EPwm2Regs.TZFRC.bit.OST=1;
EDIS;

}

发PWM波程序如下:

InvPower.SpwmData0是一个正弦数据表

void InvSpwm(void)
{
Uint16 temp1;

if(InvPower.SpwmData0>=0)
{

temp1=InvPower.SpwmData0;

if(temp1>(2500-1))temp1=2500-1;

EPwm1Regs.CMPA.bit.CMPA =2499-temp1;

EPwm2Regs.CMPA.bit.CMPA =2499;
}
else
{

temp1=-InvPower.SpwmData0;

if(temp1>(2500-1))temp1=2500-1;

EPwm1Regs.CMPA.bit.CMPA =temp1;

EPwm2Regs.CMPA.bit.CMPA =0;
}

}

PWM1图片；

PWM2图片:

PWM3图片: