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代码如下,求解TMS320F28027 PWM 设计在用UP-DOWN 模式下出不来PWM 急

代码如下,求解TMS320F28027  PWM 设计在用UP-DOWN 模式下出不来PWM 急
   
GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 1;   //设置为PWM模式
   GpioCtrlRegs.GPAPUD.bit.GPIO0 =  1;   // disable pullup on GPIO0
   GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 1;   //设置为PWM模式
   GpioCtrlRegs.GPAPUD.bit.GPIO1 =  1;   // disable pullup on GPIO0
   //设置时钟 系统时钟/HSPCLKDIV*CLKDIV
   EPwm1Regs.TBCTL.bit.HSPCLKDIV = 0x00;
   EPwm1Regs.TBCTL.bit.CLKDIV = 0x00;
   //如上设置时间为1/50M = 20ns
   EPwm1Regs.TBPRD= 1000;               // 设置周期为20u 1MHZ的频率
   //不用同步
   EPwm1Regs.TBCTL.bit.SYNCOSEL=0x00;
   EPwm1Regs.TBCTL.bit.PHSEN  = 0X00;   // 同步信号使能信号
   EPwm1Regs.TBPHS.half.TBPHS = 0X00;   //同步信号使能后偏移信号
   EPwm1Regs.TBCTR            =0X00;
   EPwm1Regs.TBCTL.bit.CTRMODE = 0X02;  //计数模式
   EPwm1Regs.TBCTL.bit.PRDLD = 0X00;    //设置TBPRD的加载模式 为上下
   EPwm1Regs.CMPCTL.bit.SHDWAMODE = 0x00;
   EPwm1Regs.CMPCTL.bit.SHDWBMODE = 0x00;
   EPwm1Regs.CMPCTL.bit.LOADAMODE  = 0X00;
   EPwm1Regs.CMPCTL.bit.LOADBMODE  = 0X00;
   EPwm1Regs.AQCTLA.bit.ZRO = 0X02;//设置计数器到达额定值的时候的动作
   EPwm1Regs.AQCTLA.bit.CAU = 0X01;//设置计数器到达CMPA值时的动作
   EPwm1Regs.CMPA.half.CMPA =       500;