TMS320F280049C: TZ异常触发

我的故障显示标志位判断如下：

if(HAL_getPwmEnableStatus(halHandle) == true) //HW OC charles
{

  if(HAL_getTripFaults(halHandle) != 0)
  {
  temp_error_value = EPWM_getTripZoneFlagStatus(halHandle->pwmHandle[0]) | EPWM_getTripZoneFlagStatus(halHandle->pwmHandle[1]) | EPWM_getTripZoneFlagStatus(halHandle-     >pwmHandle[2]);

motorVars.faultNow.bit.moduleOverCurrent = 1;
Flag_Faults_II = (Flag_Faults_II | ((uint64_t)0x01 << (1 - 1)));//故障定义位1 硬件过流

  }

}

static inline uint16_t HAL_getTripFaults(HAL_Handle handle)
{
HAL_Obj *obj = (HAL_Obj *)handle;
uint16_t tripFault = 0;

tripFault = (EPWM_getTripZoneFlagStatus(obj->pwmHandle[0]) &
(EPWM_TZ_FLAG_OST | EPWM_TZ_FLAG_DCAEVT1 | EPWM_TZ_FLAG_DCAEVT2)) |
(EPWM_getTripZoneFlagStatus(obj->pwmHandle[1]) &
(EPWM_TZ_FLAG_OST | EPWM_TZ_FLAG_DCAEVT1 | EPWM_TZ_FLAG_DCAEVT2)) |
(EPWM_getTripZoneFlagStatus(obj->pwmHandle[2]) &
(EPWM_TZ_FLAG_OST | EPWM_TZ_FLAG_DCAEVT1 | EPWM_TZ_FLAG_DCAEVT2));

}

故障出现在停机时刻，我当前的停机控制做了一个逻辑，降速到3000转上桥臂全部断开，下桥臂全部闭合制动，在此制动过程中如果检测电流大于设定阈值将PWM全关闭（软件强制触发TZ的方式）

在故障时刻temp_error_value 读取到的值为EPWM_TZ_FLAG_OST；TZ口原先用示波器测量过未发现明显下探信号，但是信号干扰比较大，为了排除原因选择了将外部输入信号上拉。