现在显示出来.....cm  定时器A没有进入中断  我想知道问题出在哪里了，怎么改，小白一个  急急急，毕业设计
#include <msp430g2553.h>

#include<stdio.h>
#include<math.h>
unsigned int result1_start,result1_end;
unsigned char index=0;
unsigned int temp;
float distance;
unsigned char juli0_cm;
unsigned char juli1_cm;
unsigned char juli2_cm;
unsigned char juli4_cm;

unsigned char font6x8[][6] = {     
{0x00,0x00,0x60,0x60,0x00,0x00},//.(0)
{0x00,0x3E,0x51,0x49,0x45,0x3E},//0(1)
{0x00,0x00,0x42,0x7F,0x40,0x00},//1(2)
{0x00,0x42,0x61,0x51,0x49,0x46},//2(3)
{0x00,0x21,0x41,0x45,0x4B,0x31},//3(4)
{0x00,0x18,0x14,0x12,0x7F,0x10},//4(5)
{0x00,0x27,0x45,0x45,0x45,0x39},//5(6)
{0x00,0x3C,0x4A,0x49,0x49,0x30},//6(7)
{0x00,0x01,0x71,0x09,0x05,0x03},//7(8)
{0x00,0x36,0x49,0x49,0x49,0x36},//8(9)
{0x00,0x06,0x49,0x49,0x29,0x1E},//9(10)
{0x00,0x38,0x44,0x44,0x44,0x20},//c(11)
{0x00,0x7E,0x02,0x0C,0x02,0x7C},//m(12)
};
void CloseWDTCTL()
{
    WDTCTL=WDTPW+WDTHOLD;
}
void ClockInit()
{
  if (CALBC1_1MHZ ==0XFF || CALDCO_1MHZ == 0XFF)
  {  P1OUT = 0X01;   }
    BCSCTL1=CALBC1_1MHZ;
    DCOCTL=CALDCO_1MHZ;
}


void PortInit()
{
  P2DIR &=~BIT1;
  P2SEL |=BIT1;
  P2DIR |=BIT0;
}
void Timer1Init()
{
  TACCTL1=CAP+CCIS_0+CM_3+CCIE+SCS;
  TA1CTL|=TASSEL_2+ID_0+MC_2+TAIE+TACLR;
  TACCR1=0;
  TACTL &=~CCIFG;
}
void send_15us()
{
  P2OUT &=~BIT0;
  delay_nus(20);
  P2OUT |=BIT0;
  delay_nus(15);
  P2OUT &=~BIT0;
}


void main(void)
{
  CloseWDTCTL();
  P1DIR=0x7f;
  P1OUT=0;
  PortInit();
  ClockInit();
  delay_nms(200);

  LCD_Init();
  Timer1Init();
  display_char(1,1,juli0_cm);
  display_char(2,1,juli1_cm);
  display_char(3,1,juli2_cm);
  display_char(4,1,0x00);
  display_char(5,1,juli4_cm);
  display_char(6,1,0x0b);
  display_char(7,1,0x0c);
  _EINT();
  while(1)
  {
    send_15us();
     delay_nms(100);
  }
}
#pragma vector=TIMER1_A3_VECTOR
__interrupt void TAIV_ISR(void)
{
  switch(TAIV)
  {
  case 2:
    if(TACCTL1&CCI)
    {
      result1_start=CCR1;
      index=0;
      break;
    }
    else
    {
      unsigned int juli;
      result1_end=CCR1;
      if(result1_end>result1_start)
        temp=result1_end-result1_start;
      else
        temp=result1_end+index*65535-result1_start;
      distance=temp*340/10000/2;
      juli=distance*10+1/2;
      juli0_cm=juli/1000+0x01;
      juli1_cm=juli%1000/100+0x01;
      juli2_cm=juli%100/10+0x01;
      juli4_cm=juli%10+0x01;
      index=0;
      break;
    }
  case 10:index++;break;
  default:break;
  }
  TACCTL1 &=~COV;
}
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