EPWM同频率输出的问题

只看该作者 · 2013-7-12 10:46

让EPWM1和EPWM2以相同的频率输出，只是前后相位不同，EPWM1主要设置如下（频率为100Hz）
EPwm1Regs.TBPRD = 18750;
EPwm1Regs.TBPHS.half.TBPHS = 0;
EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN;
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;
EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm1Regs.TBCTL.bit.SYNCOSEL =TB_CTR_ZERO;

EPwm1Regs.TBCTL.bit.HSPCLKDIV = 2;
EPwm1Regs.TBCTL.bit.CLKDIV = 2;

EPwm1Regs.CMPA.half.CMPA = 12500;
EPwm1Regs.CMPB = 6250;
EPWM2的主要设置如下：
EPwm2Regs.TBPRD = 18750;
EPwm2Regs.TBPHS.half.TBPHS = 12500;
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN;
EPwm2Regs.TBCTL.bit.PHSEN = TB_ENABLE; //使能PHASE寄存器
EPwm2Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN;

EPwm2Regs.CMPA.half.CMPA = 12500;
EPwm2Regs.CMPB = 6250;
为什么EPWM2的输出频率是800Hz，为什么不是同频率呢？例程上的例子是这么设置的，只不过相位相同？求教导！！！