Rc5 remote decode for MSP430

#include "msp430x22x4.h"

/* RC5 Protocol Receiver algorithm
using Hardware-Interrupt based on Capture/Compare Mode
using MSP430. Algorithm-Only - Test Code
*/

/* Prototypes */
void sysInit(void);
void setupIR(void);
void setupTimer(void);

/* GPIO Constants */
#define LED0 0x01
#define LED1 0x02
#define IRIN 0x04

#define BIT_TIME_3BY4 17

int IRData=0;
int BitCount=0;

void main(void)
{
__disable_interrupt();
sysInit();
setupIR();
setupTimer();
__enable_interrupt();

__bis_SR_register(LPM3_bits + GIE);
}

void sysInit(void) {
WDTCTL = WDTPW + WDTHOLD;
BCSCTL3 |= LFXT1S_2;
}

void setupIR(void) {
P1DIR |= LED0 + LED1;
P1OUT |= LED1;
P1OUT &= ~LED0;
P1SEL |= IRIN;
P1DIR &= ~IRIN;
}

void setupTimer(void) {

TACCTL1 = CM_2 + CCIS_0 + SCS + CAP + CCIE;
TACTL = TASSEL_1 + MC_2 + TAIE;
}

#pragma vector=TIMERA1_VECTOR
__interrupt void ReceiveIR(void)
{
switch (TAIV)
{
case 2: {
P1OUT |= LED0;
if (BitCount > 12) {
BitCount =0;
TAR=0;
TACCTL1 = CM_2 + CCIS_0 + SCS + CAP + CCIE;
TACCTL1 &= ~CCIFG;
P1OUT &= ~LED0;
break;
}
if (TACCTL1 & CAP) {
TACCTL1 &= ~CAP;
TACCR1 += BIT_TIME_3BY4;
} else {
IRData <<= 1;
if (TACCTL1 & SCCI) { IRData |= 0x01;}
TAR =0;
TACCTL1 = CM_3 + CCIS_0 + SCS + CAP + CCIE;
BitCount++;
}
break;
}
case 4: break;
case 10: break;
}
}