F28035 用外部输入过流信号至TZ1封锁PWM慢是怎么回事

只看该作者 · 2017-9-7 16:15

用TZ引脚接受外部输入过流信号来触发封锁PWM，但是很慢，经过排查，发现同步（Sync）貌似有问题，我用软件给OSHT置1就可以封锁，但是外部触发就是很慢，而且一点外部过流信号消失又会发出PWM，TZ配置如下：
EALLOW;
// CPU Halt Trip
EPwm1Regs.TZSEL.bit.CBC6=0x1;
EPwm2Regs.TZSEL.bit.CBC6=0x1;
EPwm3Regs.TZSEL.bit.CBC6=0x1;
EPwm1Regs.TZSEL.bit.OSHT1 = 1;  //enable TZ1 for OSHT
EPwm2Regs.TZSEL.bit.OSHT1 = 1;  //enable TZ1 for OSHT
EPwm3Regs.TZSEL.bit.OSHT1 = 1;  //enable TZ1 for OSHT

// What do we want the OST/CBC events to do?
// TZA events can force EPWMxA
// TZB events can force EPWMxB

EPwm1Regs.TZCTL.bit.TZA = TZ_FORCE_LO; // EPWMxA will go low
EPwm1Regs.TZCTL.bit.TZB = TZ_FORCE_LO; // EPWMxB will go low

EPwm2Regs.TZCTL.bit.TZA = TZ_FORCE_LO; // EPWMxA will go low
EPwm2Regs.TZCTL.bit.TZB = TZ_FORCE_LO; // EPWMxB will go low

EPwm3Regs.TZCTL.bit.TZA = TZ_FORCE_LO; // EPWMxA will go low
EPwm3Regs.TZCTL.bit.TZB = TZ_FORCE_LO; // EPWMxB will go low

EDIS;

// Clear any spurious OV trip
EPwm1Regs.TZCLR.bit.OST = 1;
EPwm2Regs.TZCLR.bit.OST = 1;
EPwm3Regs.TZCLR.bit.OST = 1;

PWM配置如下：
#define PWM_INIT_MACRO(ch1,ch2,ch3,v) \
      /* Setup Sync*/ \
      (*ePWM[ch1]).TBCTL.bit.SYNCOSEL = 0;    /* Pass through*/ \
   (*ePWM[ch2]).TBCTL.bit.SYNCOSEL = 0;    /* Pass through*/ \
   (*ePWM[ch3]).TBCTL.bit.SYNCOSEL = 0;    /* Pass through*/ \
     \
      /* Allow each timer to be sync'ed*/ \
      (*ePWM[ch1]).TBCTL.bit.PHSEN = 1; \
      (*ePWM[ch2]).TBCTL.bit.PHSEN = 1; \
      (*ePWM[ch3]).TBCTL.bit.PHSEN = 1; \
         \
      /* Init Timer-Base Period Register for EPWM1-EPWM3*/ \
      (*ePWM[ch1]).TBPRD = v.PeriodMax; \
      (*ePWM[ch2]).TBPRD = v.PeriodMax; \
      (*ePWM[ch3]).TBPRD = v.PeriodMax; \
\
      /* Init Timer-Base Phase Register for EPWM1-EPWM3*/ \
      (*ePWM[ch1]).TBPHS.half.TBPHS = 0; \
      (*ePWM[ch2]).TBPHS.half.TBPHS = 0; \
      (*ePWM[ch3]).TBPHS.half.TBPHS = 0; \
\
      /* Init Timer-Base Control Register for EPWM1-EPWM3*/ \
      (*ePWM[ch1]).TBCTL.all = PWM_INIT_STATE; \
   (*ePWM[ch2]).TBCTL.all = PWM_INIT_STATE; \
   (*ePWM[ch3]).TBCTL.all = PWM_INIT_STATE; \
\
      /* Init Compare Control Register for EPWM1-EPWM3*/ \
      (*ePWM[ch1]).CMPCTL.all = CMPCTL_INIT_STATE; \
      (*ePWM[ch2]).CMPCTL.all = CMPCTL_INIT_STATE; \
      (*ePWM[ch3]).CMPCTL.all = CMPCTL_INIT_STATE; \
\
      /* Init Action Qualifier Output A Register for EPWM1-EPWM3*/ \
      (*ePWM[ch1]).AQCTLA.all = AQCTLA_INIT_STATE; \
      (*ePWM[ch2]).AQCTLA.all = AQCTLA_INIT_STATE; \
      (*ePWM[ch3]).AQCTLA.all = AQCTLA_INIT_STATE; \
\
      /* Init Dead-Band Generator Control Register for EPWM1-EPWM3*/ \
      (*ePWM[ch1]).DBCTL.all = DBCTL_INIT_STATE; \
      (*ePWM[ch2]).DBCTL.all = DBCTL_INIT_STATE; \
      (*ePWM[ch3]).DBCTL.all = DBCTL_INIT_STATE; \
\
      /* Init Dead-Band Generator for EPWM1-EPWM3*/ \
      (*ePWM[ch1]).DBFED = v.Deadband; \
      (*ePWM[ch1]).DBRED = v.Deadband; \
      (*ePWM[ch2]).DBFED = v.Deadband; \
      (*ePWM[ch2]).DBRED = v.Deadband; \
      (*ePWM[ch3]).DBFED = v.Deadband; \
      (*ePWM[ch3]).DBRED = v.Deadband; \
\
      /* Init PWM Chopper Control Register for EPWM1-EPWM3*/ \
      (*ePWM[ch1]).PCCTL.all = PCCTL_INIT_STATE; \
      (*ePWM[ch2]).PCCTL.all = PCCTL_INIT_STATE; \
      (*ePWM[ch3]).PCCTL.all = PCCTL_INIT_STATE; \
      \
      EALLOW;                      /* Enable EALLOW */ \
\
      /* Init Trip Zone Select Register*/ \
      (*ePWM[ch1]).TZSEL.all = TZSEL_INIT_STATE; \
      (*ePWM[ch2]).TZSEL.all = TZSEL_INIT_STATE; \
      (*ePWM[ch3]).TZSEL.all = TZSEL_INIT_STATE; \
\
      EDIS;                      /* Disable EALLOW*/

基本上都是参考TI官方的程序做的，查了寄存器也看不出什么问题