ttt.c

msp430 脉冲检测程序利用TIMERB的CCI1B检测脉冲个数及频率

#include  <msp430x44x.h>

int start=0;

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  FLL_CTL0 |= XCAP18PF;                     // Set load capacitance
  
  P1DIR |= BIT5;                             // Set P1.1,4,5 as outputs
  P1SEL |= BIT5;                             // Select P1.1,4,5 as clocks

  P2SEL |= BIT2;
  
  TBCTL |= TBSSEL0 + TBCLR + TBIE + MC1;
  TBCCTL1 = CM1 + CAP + CCIE;

  _EINT();
  TBCTL |= TBCLR;
  TBCCR1 = 0;
  while(1);                                 // Loop in place
}

#pragma vector=TIMERB1_VECTOR
__interrupt void Timer_B(void)
{
  switch( TBIV )
 {
   case  2: 
     
     start=TBR;//记录初始时间
     _NOP();
     
            break;                          // CCR1 not used
   
   case 14: 
            break;
 }
  
}