F5638 on TS430PZ100USB board RTC weirdness

/* --COPYRIGHT--,BSD
 * Copyright (c) 2014, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * --/COPYRIGHT--*/
//******************************************************************************
//!
//! RTC_B in Calendar mode, Interruptions every 1s, 1m, and 5th day of
//!     week at 5:00pm
//!
//!  This program demonstrates the RTC mode by triggering an interrupt every
//!  second and minute. This code toggles P1.0 every second. This code
//!  recommends an external LFXT1 crystal for RTC accuracy.
//!  Note that if XT1 is not present the code loops in an infinite loop.
//!  ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
//!
//!  Tested On: MSP430F6638
//!             -----------------
//!        /|\ |              XIN|-
//!         |  |                 | 32kHz
//!         ---|RST          XOUT|-
//!            |                 |
//!            |            P1.0 |--> Toggles every second
//!            |                 |
//!
//!
//! This example uses the following peripherals and I/O signals.  You must
//! review these and change as needed for your own board:
//! - RTC peripheral
//! - UCS peripheral
//! - GPIO Port peripheral
//!
//! This example uses the following interrupt handlers.  To use this example
//! in your own application you must add these interrupt handlers to your
//! vector table.
//! - RTC_B_VECTOR
//!
//******************************************************************************
#include "driverlib.h"

volatile Calendar newTime;

void main(void)
{
        Calendar currentTime;

        WDT_A_hold(WDT_A_BASE);

        //Set P1.0 to output direction
        GPIO_setAsOutputPin(
                GPIO_PORT_P1,
                GPIO_PIN0
                );

        //Initialize LFXT1
        UCS_LFXT1Start(UCS_XT1_DRIVE3,
                       UCS_XCAP_3
                       );

        //Setup Current Time for Calendar
        currentTime.Seconds    = 0x00;
        currentTime.Minutes    = 0x26;
        currentTime.Hours      = 0x13;
        currentTime.DayOfWeek  = 0x03;
        currentTime.DayOfMonth = 0x20;
        currentTime.Month      = 0x07;
        currentTime.Year       = 0x2011;

        //Initialize Calendar Mode of RTC
        /*
         * Base Address of the RTC_B
         * Pass in current time, intialized above
         * Use BCD as Calendar Register Format
         */
        RTC_B_calendarInit(RTC_B_BASE,
                           currentTime,
                           RTC_B_FORMAT_BCD);

        //Setup Calendar Alarm for 5:00pm on the 5th day of the week.
        //Note: Does not specify day of the week.
        RTC_B_setCalendarAlarm(RTC_B_BASE,
                               0x00,
                               0x17,
                               RTC_B_ALARMCONDITION_OFF,
                               0x05);

        //Specify an interrupt to assert every minute
        RTC_B_setCalendarEvent(RTC_B_BASE,
                               RTC_B_CALENDAREVENT_MINUTECHANGE);

        //Enable interrupt for RTC Ready Status, which asserts when the RTC
        //Calendar registers are ready to read.
        //Also, enable interrupts for the Calendar alarm and Calendar event.
        RTC_B_clearInterrupt(RTC_B_BASE,
                             RTCRDYIFG + RTCTEVIFG + RTCAIFG);
        RTC_B_enableInterrupt(RTC_B_BASE,
                              RTCRDYIE + RTCTEVIE + RTCAIE);

        //Start RTC Clock
        RTC_B_startClock(RTC_B_BASE);

        //Enter LPM3 mode with interrupts enabled
        __bis_SR_register(LPM0_bits + GIE);
        __no_operation();
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=RTC_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(RTC_VECTOR)))
#endif
void RTC_B_ISR(void)
{
        switch (__even_in_range(RTCIV, 16)) {
        case 0: break;  //No interrupts
        case 2:         //RTCRDYIFG
                //Toggle P1.0 every second
                GPIO_toggleOutputOnPin(
                        GPIO_PORT_P1,
                        GPIO_PIN0);
                break;
        case 4:         //RTCEVIFG
                //Interrupts every minute
                __no_operation();

                //Read out New Time a Minute Later BREAKPOINT HERE
                newTime = RTC_B_getCalendarTime(RTC_B_BASE);
                break;
        case 6:         //RTCAIFG
                //Interrupts 5:00pm on 5th day of week
                __no_operation();
                break;
        case 8: break;  //RT0PSIFG
        case 10: break; //RT1PSIFG
        case 12: break; //Reserved
        case 14: break; //Reserved
        case 16: break; //Reserved
        default: break;
        }
}