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28035的同步EPWM1SYNCI输入信号

user3900194
Genius 4261 points


请问几个问题：

（1）dsp28035中的同步信号，一般用时，PWM2以PWM1基准，能不能PWM1以PWM2为基准？

（2）EPWM1SYNCI的输入信号能不能是EPWM2SYNCO，或者是EPWM6SYNCO？

（3）不不能用PWM6作为PWM12345的同步输入信号呢？

  • 0
    TI__Guru** 101655 points
    参考芯片手册第222页:www.ti.com.cn/.../sprui10.pdf
    The synchronization signals daisy chain the ePWM modules together. Each module can be configured to either use or ignore its synchronization input. The clock synchronization input and output signal are brought out to pins only for ePWM1 (ePWM module #1).
    同步指其他从模块和主模块PWM1保持同步，主模块是整个PWM系统的基本时基，后面的从PWM模块靠主模块PWM1的CTR=0信号来同步，PWM1不存在同步问题
  • 0 回复 Green Deng
    Genius 4261 points
    收到，非常感谢您的答疑
  • 0 回复 Green Deng
    Genius 4261 points
    我是不是还可以这样：PWM1不使能同步信号，以PWM2基准，PWM3/45/6以PWM2为基准参数，下面配置可以吗？
    EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;
    EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO;

    EPwm2Regs.TBCTL.bit.PHSEN = TB_DISABLE;
    EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO;
    EPwm2Regs.TBPHS.half.TBPHS = 0;

    EPwm3Regs.TBCTL.bit.PHSEN = TB_ENABLE;
    EPwm3Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN;
    EPwm3Regs.TBPHS.half.TBPHS = 180;

    EPwm4Regs.TBCTL.bit.PHSEN = TB_ENABLE;
    EPwm4Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN;
    EPwm4Regs.TBPHS.half.TBPHS = 180;

    EPwm5Regs.TBCTL.bit.PHSEN = TB_ENABLE;
    EPwm5Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN;
    EPwm5Regs.TBPHS.half.TBPHS = 0;

    EPwm6Regs.TBCTL.bit.PHSEN = TB_ENABLE;
    EPwm6Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN;
    EPwm6Regs.TBPHS.half.TBPHS = 0;