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EPWM同步的问题

Troublemaker
Expert 2117 points


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！

  • 0
    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
    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 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;