Timer Input Capture Mode Interrupt not Triggered

[seanasl]

Dear All ,

I am rather new to MSP430. I have the following code to capture an input signal from a sensor (using function generator for testing now). However , the interrupt is not triggered upon the function generator power up. I am using P1.0 to connect to a led while P1.1(TA0) used as capture input.

Any comments or mistake i have made ?? Thank you.

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#include  <msp430x14x.h>

unsigned int new_cap=0;

void main(void)

{

 volatile unsigned int i;

 WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer

 for (i=0; i<5000; i++);                   // Delay for crystal stabilization

 

 P1DIR = 0x01;                             // Set P1.0 out,1.1 input dir

   

 P1SEL = 0x02;                             // Set P1.1 to TA0  

 CCTL0 = CM_1 + CCIS_0 + CAP + CCIE; // Rising edge + CCI0A (P1.1)

                                            // + Capture Mode + Interrupt

  

 TACTL = TASSEL_3 + MC_1;                  // SMCLK + Continuous Mode

 _BIS_SR(GIE);                 // LPM0 + Enable global ints

while(1){

for (i=0; i<50000; i++)

  P1OUT &= ~0x01;                           // LED off

  for (i=0; i<50000; i++)

  P1OUT |= 0x01;

}

    _BIS_SR(LPM0_bits + GIE);                 // LPM0 + Enable global ints

  

}

#pragma vector=TIMERA0_VECTOR

__interrupt void TimerA0(void)

{

   new_cap = TACCR0;

}

[LaunchRed]

TA0 is not capture input. TA0 is output.

Search in Datasheet specific device, for inputs, for example:

In case msp430g2553:

.