msp430g2553 用捕获的方法测脉宽长度，但一直测的有问题，求救啊

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楼主 | 2020-12-3 09:31 | 只看该作者回帖奖励

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msp430g2553, se, ov, RF, cis

msp430g2553 用捕获的方法测脉宽长度，但一直测的有问题，求救啊
程序如下:

#include "msp430g2553.h"
unsigned int start,end,overflow;
float num;
void main( void )
{
  WDTCTL = WDTPW + WDTHOLD;
  BCSCTL1 = CALBC1_8MHZ;
  DCOCTL = CALDCO_8MHZ;
  TA1CTL = TASSEL_1 + MC_2 + TAIE;
  TA1CCTL2 = CM_1 + CCIS_1 + CAP + CCIE + SCS;


  P2DIR |=BIT4;
  P2DIR &=~BIT5;
  P2SEL |=BIT5;
  _EINT();
  while(1);
}

#pragma vector = TIMER1_A1_VECTOR
__interrupt void Timer_A(void)
{
  switch(TA1IV)
  {
  case 4:
      if(TA1CCTL2&CM0)
      {
      start = TA1CCR2;
      TA1CCTL2 = CM_2 + CCIS_1 + CAP + CCIE + SCS;
      overflow = 0;
      }
      else if(TA1CCTL2&CM1)
      {
      end = TA1CCR2;
      TA1CCTL2 = CM_1 + CCIS_1 + CAP + CCIE + SCS;
      num = (end  + overflow*65535 - start);
      }
      break;
  case 10:
      overflow++;
      break;
  default:break;
  }

}

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