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/*****************************************************************
//功能：利用定時器A的捕捉能測量脈沖信號的脈寬
//
//
//                MSP430F449
//             -----------------
//         /|\|              XIN|-
//          | |                 | 32kHz
//          --|RST          XOUT|-
//            |                 |
//            |        P1.5/ACLK|---+
//            |                 |   |
//            |         P2.0/TA2|<--+
//            |                 |
//            |                 |
//說明：ACLK要進行8分頻(4K),并將其作為外部的要捕獲的脈沖;
//MCLK=SMCLK=8M;
*****************************************************************/
#include  <msp430x44x.h>
int pwm_start,pwm_end,pwm_wide=0;

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  P1DIR = 0x20;                   //  P1.5 輸出
  P1SEL = 0x20;              // P1.5輸出ACLK
 
  P2SEL|=BIT0;                              //P2.0 CCI2A
 
  SCFI0 |= FN_4;
  SCFQCTL = 121;                   // (121+1) ×32768 *2= 7.99Mhz
  FLL_CTL0=DCOPLUS+OSCCAP1;       //MCLK=SMCLK=8M
 
  FLL_CTL1 |= FLL_DIV_8;                         //ACLK要進行8分頻,ACLK=4K
 
 
  TACCTL2 =CAP+CM_3+CCIS_0+SCS+CCIE;  //捕獲模式，上升和下降都捕獲，選擇CCI2A，同步，捕獲中斷開        
                                      //Capture input select: 0 - CCI2A
  TACTL = TASSEL_2 + MC_2 ;    //SMCLK=8M,L連續計數模式
  _EINT();                 //開總中斷
  LPM0;
  _NOP();
  pwm_wide=pwm_end-pwm_start;

  while(1);
}

// Timer_A3 Interrupt Vector (TAIV) handler
#pragma vector=TIMERA1_VECTOR
__interrupt void Timer_A(void)
{
 
  switch(TAIV)
 {case 2:break;
  case 4:
     if(TACCTL2 & CCI)
        pwm_start=CCR2;  
     else
        pwm_end=CCR2;
     //pwm_wide=pwm_end-pwm_start;
     break;
  case 10:
     break;
  }
  LPM0_EXIT;
}