TI中文支持网EPwm1Regs.TBPRD = 2500; //period register EPwm1Regs.TBPHS.half.TBPHS=0; // Set Phase register to zero
EPwm1Regs.TBCTL.bit.CTRMODE = 2; // Up-Down mode // Symmetrical mode
EPwm1Regs.TBCTL.bit.PHSEN = 0; // Master module
EPwm1Regs.TBCTL.bit.PRDLD = 0;
EPwm1Regs.TBCTL.bit.SYNCOSEL = 1; // Sync down-stream module
EPwm1Regs.TBCTL.bit.HSPCLKDIV =1;//1; //TBCLK=50M
EPwm1Regs.TBCTL.bit.CLKDIV = 0;
EPwm1Regs.CMPCTL.bit.SHDWAMODE = 0;
EPwm1Regs.CMPCTL.bit.SHDWBMODE = 0;
EPwm1Regs.CMPCTL.bit.LOADAMODE = 0; //1// load on CTR=Zero
EPwm1Regs.CMPCTL.bit.LOADBMODE = 0; //1// load on CTR=Zero
EPwm1Regs.AQCTLA.bit.CAU = 2; // set actions for EPWM1A
EPwm1Regs.AQCTLA.bit.CAD = 1; // active high EPwm1Regs.AQCTLB.bit.CAU = 1; // set actions for EPWM1B
EPwm1Regs.AQCTLB.bit.CAD = 2; //active low
EPwm1Regs.DBFED =200; // 4us
EPwm1Regs.DBRED =200; // 4us
//EPwm1Regs.DBCTL.bit.POLSEL = 1; // Active Lo complementary
EPwm1Regs.DBCTL.bit.POLSEL = 2; // Active Hi complementary
EPwm1Regs.DBCTL.bit.OUT_MODE = 3; // enable Dead-band module
像这样依次配置6路PWM，用示波器检测的时候发现，每一路的波形之间有一个相位差，也就意味着这6个定时器不是同步启动的，请问有什么方法可以让6个定时器同步启动吗？以获得6路同步的波形。
cheng Chang1：
6路是指PWM1A PWM2A…PWM6A，而且给的占空比都是相同的。
EPwm1Regs.TBPRD = 2500; //period register EPwm1Regs.TBPHS.half.TBPHS=0; // Set Phase register to zero
EPwm1Regs.TBCTL.bit.CTRMODE = 2; // Up-Down mode // Symmetrical mode
EPwm1Regs.TBCTL.bit.PHSEN = 0; // Master module
EPwm1Regs.TBCTL.bit.PRDLD = 0;
EPwm1Regs.TBCTL.bit.SYNCOSEL = 1; // Sync down-stream module
EPwm1Regs.TBCTL.bit.HSPCLKDIV =1;//1; //TBCLK=50M
EPwm1Regs.TBCTL.bit.CLKDIV = 0;
EPwm1Regs.CMPCTL.bit.SHDWAMODE = 0;
EPwm1Regs.CMPCTL.bit.SHDWBMODE = 0;
EPwm1Regs.CMPCTL.bit.LOADAMODE = 0; //1// load on CTR=Zero
EPwm1Regs.CMPCTL.bit.LOADBMODE = 0; //1// load on CTR=Zero
EPwm1Regs.AQCTLA.bit.CAU = 2; // set actions for EPWM1A
EPwm1Regs.AQCTLA.bit.CAD = 1; // active high EPwm1Regs.AQCTLB.bit.CAU = 1; // set actions for EPWM1B
EPwm1Regs.AQCTLB.bit.CAD = 2; //active low
EPwm1Regs.DBFED =200; // 4us
EPwm1Regs.DBRED =200; // 4us
//EPwm1Regs.DBCTL.bit.POLSEL = 1; // Active Lo complementary
EPwm1Regs.DBCTL.bit.POLSEL = 2; // Active Hi complementary
EPwm1Regs.DBCTL.bit.OUT_MODE = 3; // enable Dead-band module
像这样依次配置6路PWM，用示波器检测的时候发现，每一路的波形之间有一个相位差，也就意味着这6个定时器不是同步启动的，请问有什么方法可以让6个定时器同步启动吗？以获得6路同步的波形。
rookiecalf：
回复 cheng Chang1:
有和例程类似地做如下的时基同步吗：
EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; EDIS;
InitEPwm1Example(); InitEPwm2Example(); InitEPwm3Example();
EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; EDIS;
EPwm1Regs.TBPRD = 2500; //period register EPwm1Regs.TBPHS.half.TBPHS=0; // Set Phase register to zero
EPwm1Regs.TBCTL.bit.CTRMODE = 2; // Up-Down mode // Symmetrical mode
EPwm1Regs.TBCTL.bit.PHSEN = 0; // Master module
EPwm1Regs.TBCTL.bit.PRDLD = 0;
EPwm1Regs.TBCTL.bit.SYNCOSEL = 1; // Sync down-stream module
EPwm1Regs.TBCTL.bit.HSPCLKDIV =1;//1; //TBCLK=50M
EPwm1Regs.TBCTL.bit.CLKDIV = 0;
EPwm1Regs.CMPCTL.bit.SHDWAMODE = 0;
EPwm1Regs.CMPCTL.bit.SHDWBMODE = 0;
EPwm1Regs.CMPCTL.bit.LOADAMODE = 0; //1// load on CTR=Zero
EPwm1Regs.CMPCTL.bit.LOADBMODE = 0; //1// load on CTR=Zero
EPwm1Regs.AQCTLA.bit.CAU = 2; // set actions for EPWM1A
EPwm1Regs.AQCTLA.bit.CAD = 1; // active high EPwm1Regs.AQCTLB.bit.CAU = 1; // set actions for EPWM1B
EPwm1Regs.AQCTLB.bit.CAD = 2; //active low
EPwm1Regs.DBFED =200; // 4us
EPwm1Regs.DBRED =200; // 4us
//EPwm1Regs.DBCTL.bit.POLSEL = 1; // Active Lo complementary
EPwm1Regs.DBCTL.bit.POLSEL = 2; // Active Hi complementary
EPwm1Regs.DBCTL.bit.OUT_MODE = 3; // enable Dead-band module
像这样依次配置6路PWM，用示波器检测的时候发现，每一路的波形之间有一个相位差，也就意味着这6个定时器不是同步启动的，请问有什么方法可以让6个定时器同步启动吗？以获得6路同步的波形。
囧：
首先，由于PWM之间内部线路传输延迟的问题，不可能通过相位同步始终没有任何误差。安装EPWM的userguide的说明，如果TBCLK是 SYSCLKOUT，那会有2个SYSCLK的误差
第二你的代码是master的代码，假如PWM2是slave，那需要修改以下两句代码：
EPwm1Regs.TBCTL.bit.PHSEN = 0， EPwm1Regs.TBCTL.bit.SYNCOSEL = 0；
这样就能保证误差是2个SYSCLK的同步
第三，你可以通过相位寄存器来补回两个SYSCLK的延时，比如PWM2，那只需要修改以下寄存器就可以：
EPwm1Regs.TBPHS.half.TBPHS=2;，可能你在调试的时候回发现并不完全是2个周期，每个PWM都可以根据实际情况调整，因为这也会被外部电路影响
EPwm1Regs.TBPRD = 2500; //period register EPwm1Regs.TBPHS.half.TBPHS=0; // Set Phase register to zero
EPwm1Regs.TBCTL.bit.CTRMODE = 2; // Up-Down mode // Symmetrical mode
EPwm1Regs.TBCTL.bit.PHSEN = 0; // Master module
EPwm1Regs.TBCTL.bit.PRDLD = 0;
EPwm1Regs.TBCTL.bit.SYNCOSEL = 1; // Sync down-stream module
EPwm1Regs.TBCTL.bit.HSPCLKDIV =1;//1; //TBCLK=50M
EPwm1Regs.TBCTL.bit.CLKDIV = 0;
EPwm1Regs.CMPCTL.bit.SHDWAMODE = 0;
EPwm1Regs.CMPCTL.bit.SHDWBMODE = 0;
EPwm1Regs.CMPCTL.bit.LOADAMODE = 0; //1// load on CTR=Zero
EPwm1Regs.CMPCTL.bit.LOADBMODE = 0; //1// load on CTR=Zero
EPwm1Regs.AQCTLA.bit.CAU = 2; // set actions for EPWM1A
EPwm1Regs.AQCTLA.bit.CAD = 1; // active high EPwm1Regs.AQCTLB.bit.CAU = 1; // set actions for EPWM1B
EPwm1Regs.AQCTLB.bit.CAD = 2; //active low
EPwm1Regs.DBFED =200; // 4us
EPwm1Regs.DBRED =200; // 4us
//EPwm1Regs.DBCTL.bit.POLSEL = 1; // Active Lo complementary
EPwm1Regs.DBCTL.bit.POLSEL = 2; // Active Hi complementary
EPwm1Regs.DBCTL.bit.OUT_MODE = 3; // enable Dead-band module
像这样依次配置6路PWM，用示波器检测的时候发现，每一路的波形之间有一个相位差，也就意味着这6个定时器不是同步启动的，请问有什么方法可以让6个定时器同步启动吗？以获得6路同步的波形。
Eric Ma：
用这个就行了：
EALLOW;SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;EDIS;
InitEPwm1Example(); InitEPwm2Example();InitEPwm3Example();
EALLOW;SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;EDIS;
Eric
