28335中6个EPWM同步怎么实现？

您好！
需要置1.
  SysCtrlRegs.PCLKCR1.bit.EPWM1ENCLK = 1;    // ePWM1
  SysCtrlRegs.PCLKCR1.bit.EPWM2ENCLK = 1;    // ePWM2
  SysCtrlRegs.PCLKCR1.bit.EPWM3ENCLK = 1;    // ePWM3
  SysCtrlRegs.PCLKCR1.bit.EPWM4ENCLK = 1;    // ePWM4
  SysCtrlRegs.PCLKCR1.bit.EPWM5ENCLK = 1;    // ePWM5
  SysCtrlRegs.PCLKCR1.bit.EPWM6ENCLK = 1;    // ePWM6
如果要实现内部同步的话，可以参考以下代码中的几句话，另外以下代码是从ePWM用户指南中81页中摘录出来的，http://www.ti.com/lit/ug/sprug04a/sprug04a.pdf

//=====================================================================
// Configuration
//=====================================================================
// Initialization Time
//========================// EPWM Module 1 config
EPwm1Regs.TBPRD = 800; // Period = 1600 TBCLK counts
EPwm1Regs.TBPHS.half.TBPHS = 0; // Set Phase register to zero
EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Symmetrical mode
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Master module
EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO; // Sync down-stream module
EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR=Zero
EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR=Zero
EPwm1Regs.AQCTLA.bit.CAU = AQ_SET; // set actions for EPWM1A
EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR;
EPwm1Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; // enable Dead-band module
EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; // Active Hi complementary
EPwm1Regs.DBFED = 50; // FED = 50 TBCLKs
EPwm1Regs.DBRED = 50; // RED = 50 TBCLKs
// EPWM Module 2 config
EPwm2Regs.TBPRD = 800; // Period = 1600 TBCLK counts
EPwm2Regs.TBPHS.half.TBPHS = 0; // Set Phase register to zero
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Symmetrical mode
EPwm2Regs.TBCTL.bit.PHSEN = TB_ENABLE; // Slave module
EPwm2Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // sync flow-through
EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR=Zero
EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR=Zero
EPwm2Regs.AQCTLA.bit.CAU = AQ_SET; // set actions for EPWM2A
EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR;
EPwm2Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; // enable Dead-band module
EPwm2Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; // Active Hi complementary
EPwm2Regs.DBFED = 50; // FED = 50 TBCLKs
EPwm2Regs.DBRED = 50; // RED = 50 TBCLKs
// EPWM Module 3 config
EPwm3Regs.TBPRD = 800; // Period = 1600 TBCLK counts
EPwm3Regs.TBPHS.half.TBPHS = 0; // Set Phase register to zero
EPwm3Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Symmetrical mode
EPwm3Regs.TBCTL.bit.PHSEN = TB_ENABLE; // Slave module
EPwm3Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm3Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // sync flow-through
EPwm3Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm3Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm3Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR=Zero
EPwm3Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR=Zero
EPwm3Regs.AQCTLA.bit.CAU = AQ_SET; // set actions for EPWM3A
EPwm3Regs.AQCTLA.bit.CAD = AQ_CLEAR;
EPwm3Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; // enable Dead-band module
EPwm3Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; // Active Hi complementary
EPwm3Regs.DBFED = 50; // FED = 50 TBCLKs
EPwm3Regs.DBRED = 50; // RED = 50 TBCLKs
// Run Time (Note: Example execution of one run-time instant)
//=========================================================
EPwm1Regs.CMPA.half.CMPA = 500; // adjust duty for output EPWM1A
EPwm2Regs.CMPA.half.CMPA = 600; // adjust duty for output EPWM2A
EPwm3Regs.CMPA.half.CMPA = 700; // adjust duty for output EPWM3A
                                                                         Young Hu 
C2000 FAE

实验程序如下：
void main(void)
[  
        DeviceInit();        // Device Life support & GPIO
        // Configure PWM1AB
        PWM_ComplPairDB_CNF(1, 400, 1, 0);
        // Configure PWM4
        PWM_1ch_CNF(4, 400, 1, 0);
         SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
for(;;);
]
我在DeviceInit() 函数中定义了EPWM的时钟：
SysCtrlRegs.PCLKCR1.bit.EPWM1ENCLK = 1;  // ePWM1
  SysCtrlRegs.PCLKCR1.bit.EPWM2ENCLK = 1;  // ePWM2
  SysCtrlRegs.PCLKCR1.bit.EPWM3ENCLK = 1;  // ePWM3
  SysCtrlRegs.PCLKCR1.bit.EPWM4ENCLK = 1;  // ePWM4
  SysCtrlRegs.PCLKCR1.bit.EPWM5ENCLK = 0;  // ePWM5
  SysCtrlRegs.PCLKCR1.bit.EPWM6ENCLK = 0;  // ePWM6
  SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;   // Enable TBCLK within the ePWM
在main 函数中
初始化设置了EPWM1 和EPWM4：
最后使能了SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
为什么非但不能使两个EPWM同步，连波形都产生不了，这是为什么？
另注：当DeviceInit() 中设置成：
SysCtrlRegs.PCLKCR1.bit.EPWM1ENCLK = 1;  // ePWM1
  SysCtrlRegs.PCLKCR1.bit.EPWM2ENCLK = 1;  // ePWM2
  SysCtrlRegs.PCLKCR1.bit.EPWM3ENCLK = 1;  // ePWM3
  SysCtrlRegs.PCLKCR1.bit.EPWM4ENCLK = 1;  // ePWM4
  SysCtrlRegs.PCLKCR1.bit.EPWM5ENCLK = 0;  // ePWM5
  SysCtrlRegs.PCLKCR1.bit.EPWM6ENCLK = 0;  // ePWM6
  SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;   // Enable TBCLK within the ePWM
且main函数：
void main(void)
[  
        DeviceInit();        // Device Life support & GPIO
        // Configure PWM1AB
        PWM_ComplPairDB_CNF(1, 400, 1, 0);
        // Configure PWM4
        PWM_1ch_CNF(4, 400, 1, 0);
for(;;);
]
此时是有波形的，也就是强调了，ＥＰＷＭ的寄存器设置是没有问题的。
谢谢解答！

楼主，上一种设置TBCLKSYNC 时，有如下操作吗?：
EALLOW;
  SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
  EDIS;