MSP430 Making an RTC and timed LED but apparently made a "busy wait"

Hi,

Im trying to count time on an artificial RTC (Im using a MSP430G2553 which doesnt have an inbuilt one) and simultaneously blink an LED at 5 second intervals. 

Eventually I want to count the number of pulses I get in a square wave and store it with a timestamp from this RTC and thought the LED step would at least show me if my RTC is working. 

I'm very VERY new to this (first ever embedded C) and I'm struggling with it a lot. This code is the product of days worth of researching and its still not working.

#include <msp430g2553.h>

#include "RTC.h"

volatile unsigned

int RTC_Counter = 0; // TIMERA0

interrupt service routine

#pragma vector=TIMERA0_VECTOR __

interrupt void Timer_A (void)

{

incrementSeconds();

RTC_Counter ++;

if(RTC_Counter > 5)

{

P1OUT = 0b00000001;

RTC_Counter = 0;

}

else {

LPM3_EXIT;

}

}

void init()

{

WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer

setTime(0x12, 0 , 0, 0); //intialise to 12:00:00AM

CCR0 = 32768 - 1;

P1DIR |= 0x00; //P1.0 output direction

TACTL = TASSEL_1+MC_1; //ACLK, UPMODE

CCTL0 |= CCIE; //ENABLE

CCRO INTERUPT _EINT(); //Enable Global interrupts

}

void main(void)

{

init();

while(1)

{

LPM3; //Enter Low power mode

}

}