MSP430F5529: MSP430F5529 communication issue over I2C with Battery BoosterPack BOOSTXL-BATPAKII

    if(UCB1IFG & UCTXIFG)
    {
        //Send first byte of data
        UCB1TXBUF = 0x02;
        printf("Sent 0x0d \n");
    }
    else
    {
        printf("Transmit Interrupt pending \n");
    }

    //Poll for transmit interrupt flag.
    while(!(UCB1IFG & UCTXIFG))                 // If UCTXIFG == 0, then wait
    {
        ;                                       // Wait for TXBUF to be empty
    }

    if(UCB1IFG & UCTXIFG)
    {
        //Send second byte of data
        UCB1TXBUF = 0x03;
        printf("Sent 0x0c \n");
    }
    else
    {
        printf("Transmit Interrupt pending \n");
    }

/**
  * @brief  Receive data from bq27441-g1 through i2c bus
  * @param  
  * @retval  0 : Operation normal
  *         -1 : Could not read data
  */
int USCI_I2C_READ(char *buffer, int num, int cmd)
{
    char *PRxData;
    int i=0;

    // Transmitter, Send start condition with addr + write
    UCB1CTL1 |= UCTR | UCTXSTT;

    /* Send command to bq27441 */
    if(UCB1IFG & UCTXIFG)
    {
        UCB1TXBUF = cmd;
    }

    //Timeout
    for (i=0; i<1000; i++) {
    	if(UCB1IFG & UCTXIFG)
    		break;
    }


    /* I2C could not send command
     * So we could not read data from bq27441
     * So we just return
     */
    if (i == 1000) {
    	return -1;
    }
    /* Start of RX buffer */
    PRxData = buffer;

    // Receiver, Send restart condition with addr + read
    UCB1CTL1 &= ~UCTR;
    UCB1CTL1 |= UCTXSTT;

    while (num > 0) {
    	for (i=0; i<1000; i++) {
			if (UCB1IFG & UCRXIFG) {
				/* Load TX buffer */
				*PRxData = UCB1RXBUF;

				/* Decrement TX byte counter */
				num--;
				PRxData++;

UCB1IFG &= ~UCRXIFG;
				break;
			}
    	}

    	if (i == 1000) {
    	   	return -1;
    	}
    }

    //Send stop condition.
    UCB1CTL1 |= UCTXSTP;

    /* Clear USCI_B1 TX int flag */
    UCB1IFG &= ~UCTXIFG;

    return 0;
}

/*
 * This function fetches the battery capacity remaining.
 *
 * @return
 * The compensated battery capacity remaining. Units are mAh.
 */
uint8_t ioport_get_battery_capacity(void)
{
    // Transmitter, Send start condition
    UCB1CTL1 |= UCTR | UCTXSTT;

    //Poll for transmit interrupt flag.
    while(!(UCB1IFG & UCTXIFG))
    {
        ;
    }

    /* Send command to bq27441 */
    if(UCB1IFG & UCTXIFG)
    {
        //Send first byte of data
        UCB1TXBUF = 0x0c;
    }

    int i;
    //Timeout
    for (i=0; i<1000; i++)
    {
        if(UCB1IFG & UCTXIFG)
            break;
    }

    /* I2C could not send command, So we could not read data from bq27441
     * So just return
     */
    if (i == 1000)
    {
        return -1;
    }

    ////////////////////////////////////////////////////////////////////////////
    // Set master in Receive mode, Send start condition
    UCB1CTL1 &= ~UCTR;
    UCB1CTL1 |= UCTXSTT;

    //Read a byte from the data received
    char *PRxData;
    char *buffer;

    /* Start of RX buffer */
    PRxData = buffer;

    for (i=0; i<1000; i++)
    {
        if (UCB1IFG & UCRXIFG)
        {
            /* Load TX buffer */
            *PRxData = UCB1RXBUF;

            PRxData++;

            UCB1IFG &= ~UCRXIFG;
            break;
        }
    }

    if (i == 1000)
    {
        return -1;
    }

    for (i=0; i<1000; i++)
    {
        if (UCB1IFG & UCRXIFG)
        {
            /* Load TX buffer */
            *PRxData = UCB1RXBUF;

            PRxData++;

            UCB1IFG &= ~UCRXIFG;
            break;
        }
    }

    if (i == 1000)
    {
        return -1;
    }


    printf("Data Received: %s \n",buffer);

    //Send stop condition.
    UCB1CTL1 |= UCTXSTP;

    /* Clear USCI_B1 TX int flag */
    UCB1IFG &= ~UCTXIFG;

    return 0;
}