求教啊，DSP28335怎么实现错误联防的功能？PWM正常输出，当TZ1低电平时强制PWM输出低

#include "DSP2833x_Device.h"    // DSP2833xHeaderfile Include File

#include "DSP2833x_Examples.h"  // DSP2833xExamples Include File

// Prototypestatements for functions found within this file.

interrupt void EPWM1_TZINT_ISR(void);

void InitEPwm1Example();

void main(void)

{

   InitSysCtrl();

   InitEPwm1Gpio();

EALLOW;

   GpioCtrlRegs.GPAMUX1.bit.GPIO12=0x1;

EDIS;

   DINT;

   InitPieCtrl();

// Disable CPUinterrupts and clear all CPU interrupt flags:

   IER = 0x0000;

   IFR = 0x0000;

   InitPieVectTable();

   EALLOW; // This isneeded to write to EALLOW protected registers

   PieVectTable.EPWM1_TZINT = &EPWM1_TZINT_ISR;//EPWM1_TZINT_ISR;

   EDIS;   // This isneeded to disable write to EALLOW protected registers

   InitEPwm1Example();

//   InitEPwm2Example();

   IER|=M_INT2;

   PieCtrlRegs.PIEIER2.bit.INTx1=1;

   EINT;  // EnableGlobal interrupt INTM

   ERTM;  // EnableGlobal realtime interrupt DBGM

// Step 6. IDLEloop. Just sit and loop forever (optional):

   for(;;)

   {

       __asm("          NOP");

   }

}

void InitEPwm1Example()

{

   EPwm1Regs.TBPRD = 937.5;                        // Set timer period

   EPwm1Regs.TBPHS.half.TBPHS = 0x0000;           // Phase is 0

   EPwm1Regs.TBCTR = 0x0000;                      // Clear counter

   EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up

   EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;        // Disable phase loading

   EPwm1Regs.TBCTL.bit.HSPCLKdiv = TB_div4;       // Clock ratio to SYSCLKOUT

   EPwm1Regs.TBCTL.bit.CLKdiv = TB_div4;

   EPwm1Regs.TBCTL.bit.SYNCOSEL=0x01;

   EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;    // Load registers every ZERO

   EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;

   EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;

   EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;

   // Set actions

   EPwm1Regs.AQCTLA.bit.ZRO = 0x2;//AQ_SET;             // Set PWM1A on Zero

   EPwm1Regs.AQCTLA.bit.PRD = 0x1;//AQ_CLEAR;

   // Active Low PWMs - Setup Deadband

   EPwm1Regs.DBCTL.bit.OUT_MODE = 0x3;//DB_FULL_ENABLE;

   EPwm1Regs.DBCTL.bit.POLSEL = 0x2;//DB_ACTV_LO;

   EPwm1Regs.DBCTL.bit.IN_MODE = 0x0;//DBA_ALL;

   EPwm1Regs.DBRED = 30;//EPWM1_MIN_DB;

   EPwm1Regs.DBFED = 30;//EPWM1_MIN_DB;

  // EPwm1_DB_Direction = DB_UP;

   EPwm1Regs.TZSEL.bit.OSHT1=1;

   EPwm1Regs.TZEINT.bit.OST=1;

   // Interrupt where we will change the Deadband

   EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO;     // Select INT on Zero event

   EPwm1Regs.ETSEL.bit.INTEN = 1;                // Enable INT

   EPwm1Regs.ETPS.bit.INTPRD = ET_3RD;           // Generate INT on 3rd event

}

// Interruptroutines uses in this example:

interrupt void EPWM1_TZINT_ISR(void)

{

          EPwm1Regs.TZCTL.bit.TZA=0x2;

          EPwm1Regs.TZCTL.bit.TZB=0x2;

          EPwm1Regs.ETCLR.bit.INT=1;

          PieCtrlRegs.PIEACK.all=PIEACK_GROUP2;

          EPwm1Regs.AQSFRC.all=0xc0;

          EPwm1Regs.AQCSFRC.bit.CSFA=0x1;

          EPwm1Regs.AQCSFRC.bit.CSFB=0x1;

      asm ("      ESTOP0");

      for(;;);

}

有人么?新人求教啊

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