用430做捕获。。。结果上升沿转下降沿捕获出了问题，跪求解决

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楼主 | 2020-12-3 09:38 | 只看该作者回帖奖励

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se, AC, define, CAPTURE, NEC

#define CM_0             (0*0x4000u) /* Capture mode: 0 - disabled */
#define CM_1             (1*0x4000u) /* Capture mode: 1 - pos. edge */
#define CM_2             (2*0x4000u) /* Capture mode: 1 - neg. edge */
#define CM_3             (3*0x4000u) /* Capture mode: 1 - both edges */
#define TBSSEL__ACLK TBSSEL_1
#define TASSEL__ACLK TASSEL_1
#define TASSEL__ACLK2 TASSEL_0
#include "msp430g2553.h"
int start,en;
  long int sum;
  int overflow=0;
void main( void )
{
int i;
WDTCTL = WDTPW + WDTHOLD;
  //BCSCTL1 = CALBC1_16MHZ;
  //DCOCTL = CALDCO_16MHZ;
  TA0CCTL1 = CCIE + CM_1 + SCS + CAP;
  TA0CTL = TASSEL__ACLK + MC_2 + TACLR + TAIE;
  CCTL1 |= CM_1+SCS+CCIS_0+CAP+CCIE; //输入上升沿捕获,CCI0A为捕获信号源
  P2DIR |=BIT4;
  P1DIR &=~BIT2;
  P1SEL |=BIT2;
_EINT();
  while(1)
{
P2OUT |=BIT4;
i=200;
while(i--);
P2OUT &=~BIT4;
i=200;
while(i--);
}
}

#pragma vector=TIMER0_A1_VECTOR
__interrupt void TIMER0_A1_ISR(void)
{

  switch(TA0IV)                                                 //TA中断向量查询
{
case 2:                                                       //是捕获中断  2为CCR1捕获中断向量值
if (TA0CCTL1 & CM0)                         //上升沿捕获
{
TA0CCTL1 &=~ CM_1;
TA0CCTL1 |= CM_2;             //改为下降沿捕获
start = TA0R;
}
  else if (TA0CCTL1 & CM1)                         //下降沿捕获
{
TA0CCTL1 &=~ CM_2;
TA0CCTL1 |= CM_1;                   //改为上升沿捕获
en = TA0R;

sum=overflow*65535+en-start;
  }
  TA0CTL = TASSEL__ACLK + MC_2 + TACLR + TAIE;
  CCTL1 |= CM_1+SCS+CCIS_0+CAP+CCIE;
break;

case 10:                                              //是溢出中断
overflow++;                               //溢出次数自加1

break;

default:
break;
}
}

程序如上，运行时无论如何也进不了那个下降沿的IF段。。。。求帮助

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用430做捕获。。。结果上升沿转下降沿捕获出了问题，跪求解决

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