EPWM同步的问题

Troublemaker

希望28335中6个EPWM同步：我在主程序main中编写以下程序：

SysCtrlRegs.PCLKCR1.bit.EPWM1ENCLK = 0; // ePWM1-ePWM6 使能（请问这里是设置成0还是1？）
SysCtrlRegs.PCLKCR1.bit.EPWM2ENCLK = 0;
SysCtrlRegs.PCLKCR1.bit.EPWM3ENCLK = 0;
SysCtrlRegs.PCLKCR1.bit.EPWM4ENCLK = 0;
SysCtrlRegs.PCLKCR1.bit.EPWM5ENCLK = 0;
SysCtrlRegs.PCLKCR1.bit.EPWM6ENCLK = 0;

SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;

EPWM1init();//对ePWM1-ePWM6 寄存器进行配置
EPWM2init();
EPWM3init();
EPWM4init();
EPWM5init();
EPWM6init();

SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;

请问上述程序能不能实现EPWM模块的同步，对不对？

谢谢！

13 年多前

0 Young Hu 13 年多前

TI__Mastermind 29385 points

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

0 Troublemaker 13 年多前

Expert 2117 points

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！

0 Forrest 13 年多前回复 Troublemaker

Guru 17055 points

楼主，上一种设置TBCLKSYNC 时，有如下操作吗?：

EALLOW;

SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;

EDIS;

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EPWM同步的问题