launchpad c2000 hrpwm

只看该作者 · 2013-4-23 10:19

谁能帮忙解释一下这段程序了！做什么用的啊？

while (update ==1)
{

      for(DutyFine =1; DutyFine <256 ;DutyFine ++)
      {

         // Example, write to the HRPWM extension of CMPA
         PWM_setCmpAHr(myPwm1, DutyFine << 8);
         PWM_setCmpAHr(myPwm2, DutyFine << 8);

         // Example, 16-bit write to CMPAHR
         PWM_setCmpAHr(myPwm3, DutyFine << 8);
         PWM_setCmpAHr(myPwm4, DutyFine << 8);

         for (i=0;i<10000;i++){                         // Dummy delay between MEP changes
         }

      }

2万 · 2013-4-24 00:11

目测设置pwm周期

只看该作者 · 2013-9-2 21:16

pmp 发表于 2013-4-24 00:11
目测设置pwm周期

???

只看该作者 · 2013-12-16 16:22

应该就是这段程序：
   for(DutyFine =1; DutyFine <256 ;DutyFine ++)
      {
      // Example, write to the HRPWM extension of CMPA
      EPwm1Regs.CMPA.half.CMPAHR = DutyFine << 8;    // Left shift by 8 to write into MSB bits
      EPwm2Regs.CMPA.half.CMPAHR = DutyFine << 8;    // Left shift by 8 to write into MSB bits

      // Example, 32-bit write to CMPA:CMPAHR
      EPwm3Regs.CMPA.all = ((Uint32)EPwm3Regs.CMPA.half.CMPA << 16) + (DutyFine << 8);
      EPwm4Regs.CMPA.all = ((Uint32)EPwm4Regs.CMPA.half.CMPA << 16) + (DutyFine << 8);

for (i=0;i<10000;i++){}                      // Dummy delay between MEP changes
}
但是不确定具体的作用，更新CMPAHR？，mep的值在哪里设置？还是系统时钟对应确定的mep，如60MHZ下180ps？

launchpad c2000 hrpwm

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