TI中文支持网应用中希望用COMP1OUT产生DCAEVT1和DCBEVT1作为OSHT锁驱动，但是配置完毕后测试发现是CBC模式的。
代码如下，帮忙看下那里有问题。
GpioCtrlRegs.AIOMUX1.bit.AIO2 = 3; // SET AIO2 ADCINA2/ COMP1A,AIO2 disabled
Comp1Regs.COMPCTL.bit.COMPDACEN = 1; // Power up Comparator locally
Comp1Regs.COMPCTL.bit.COMPSOURCE = 0; // Connect the inverting input to internal DAC
Comp1Regs.DACVAL.bit.DACVAL = LLC_CURRENT_LIMIT;
Comp1Regs.DACCTL.bit.DACSOURCE = 0; // 0 – DACVAL; 1 – Internal ramp for slope compensation
/***************************************************************************************************/
EPwm1Regs.DCTRIPSEL.bit.DCAHCOMPSEL = DC_COMP1OUT;
EPwm1Regs.TZDCSEL.bit.DCAEVT1 = TZ_DCAH_HI;
EPwm1Regs.DCACTL.bit.EVT1SRCSEL = DC_EVT1;
EPwm1Regs.DCACTL.bit.EVT1FRCSYNCSEL = DC_EVT_ASYNC;
EPwm1Regs.DCTRIPSEL.bit.DCBHCOMPSEL = DC_COMP1OUT;
EPwm1Regs.TZDCSEL.bit.DCBEVT1 = TZ_DCBH_HI;
EPwm1Regs.DCBCTL.bit.EVT1SRCSEL = DC_EVT1;
EPwm1Regs.DCBCTL.bit.EVT1FRCSYNCSEL = DC_EVT_ASYNC;
EPwm1Regs.TZSEL.bit.DCAEVT1 = 1; /* Enable DCAEVT1 as one-shot-trip source for this ePWM module.*/
EPwm1Regs.TZSEL.bit.DCBEVT1 = 1; /* Enable DCBEVT1 as one-shot-trip source for this ePWM module.*/
EPwm1Regs.TZCTL.bit.TZA = TZ_FORCE_LO;
EPwm1Regs.TZCTL.bit.TZB = TZ_FORCE_LO;
EPwm1Regs.TZCTL.bit.DCAEVT1 = TZ_FORCE_LO;
EPwm1Regs.TZCTL.bit.DCBEVT1 = TZ_FORCE_LO;
请问哪里出问题了，为何OSHT变成CBC??
囧：
你的配置有问题，把下面两句注解就好了
EPwm1Regs.TZCTL.bit.DCAEVT1 = TZ_FORCE_LO; EPwm1Regs.TZCTL.bit.DCBEVT1 = TZ_FORCE_LO;
应用中希望用COMP1OUT产生DCAEVT1和DCBEVT1作为OSHT锁驱动，但是配置完毕后测试发现是CBC模式的。
代码如下，帮忙看下那里有问题。
GpioCtrlRegs.AIOMUX1.bit.AIO2 = 3; // SET AIO2 ADCINA2/ COMP1A,AIO2 disabled
Comp1Regs.COMPCTL.bit.COMPDACEN = 1; // Power up Comparator locally
Comp1Regs.COMPCTL.bit.COMPSOURCE = 0; // Connect the inverting input to internal DAC
Comp1Regs.DACVAL.bit.DACVAL = LLC_CURRENT_LIMIT;
Comp1Regs.DACCTL.bit.DACSOURCE = 0; // 0 – DACVAL; 1 – Internal ramp for slope compensation
/***************************************************************************************************/
EPwm1Regs.DCTRIPSEL.bit.DCAHCOMPSEL = DC_COMP1OUT;
EPwm1Regs.TZDCSEL.bit.DCAEVT1 = TZ_DCAH_HI;
EPwm1Regs.DCACTL.bit.EVT1SRCSEL = DC_EVT1;
EPwm1Regs.DCACTL.bit.EVT1FRCSYNCSEL = DC_EVT_ASYNC;
EPwm1Regs.DCTRIPSEL.bit.DCBHCOMPSEL = DC_COMP1OUT;
EPwm1Regs.TZDCSEL.bit.DCBEVT1 = TZ_DCBH_HI;
EPwm1Regs.DCBCTL.bit.EVT1SRCSEL = DC_EVT1;
EPwm1Regs.DCBCTL.bit.EVT1FRCSYNCSEL = DC_EVT_ASYNC;
EPwm1Regs.TZSEL.bit.DCAEVT1 = 1; /* Enable DCAEVT1 as one-shot-trip source for this ePWM module.*/
EPwm1Regs.TZSEL.bit.DCBEVT1 = 1; /* Enable DCBEVT1 as one-shot-trip source for this ePWM module.*/
EPwm1Regs.TZCTL.bit.TZA = TZ_FORCE_LO;
EPwm1Regs.TZCTL.bit.TZB = TZ_FORCE_LO;
EPwm1Regs.TZCTL.bit.DCAEVT1 = TZ_FORCE_LO;
EPwm1Regs.TZCTL.bit.DCBEVT1 = TZ_FORCE_LO;
请问哪里出问题了，为何OSHT变成CBC??
Tommy Wei：
回复 Eric Ma:
谢谢Eric的解答。
问题已经找到，是在代码中关机态和开机态分别使用了软件强制OST造成的。
