MSP432 PWM Variable Duty Cycle Example Not Changing Duty Cycle

/*
 * -------------------------------------------
 *    MSP432 DriverLib - v2_20_00_08 
 * -------------------------------------------
 *
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 * Copyright (c) 2014, Texas Instruments Incorporated
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 *
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/*******************************************************************************
 * MSP432 Timer_A - Variable PWM
 *
 * Description: In this example, the Timer_A module is used to create a precision 
 * PWM with an adjustable duty cycle. The PWM initial period is 200 ms and is
 * output on P2.4. The initial duty cycle of the PWM is 10%, however when the
 * button is pressed on P1.1 the duty cycle is sequentially increased by 10%.
 * Once the duty cycle reaches 90%, the duty cycle is reset to 10% on the
 * following button press.
 *
 *                MSP432P401
 *             ------------------
 *         /|\|                  |
 *          | |                  |
 *          --|RST         P1.1  |<--Toggle Switch
 *            |                  |
 *            |                  |
 *            |            P2.4  |--> Output PWM
 *            |                  |
 *            |                  |
 *
* Author: Timothy Logan
 *******************************************************************************/
/* DriverLib Includes */
#include "driverlib.h"

/* Standard Includes */
#include <stdint.h>

#include <stdbool.h>

/* Timer_A PWM Configuration Parameter */
Timer_A_PWMConfig pwmConfig =
{
        TIMER_A_CLOCKSOURCE_SMCLK,
        TIMER_A_CLOCKSOURCE_DIVIDER_1,
        32000,
        TIMER_A_CAPTURECOMPARE_REGISTER_1,
        TIMER_A_OUTPUTMODE_RESET_SET,
        3200
};

int main(void)
{
    /* Halting the watchdog */
    MAP_WDT_A_holdTimer();

    /* Setting MCLK to REFO at 128Khz for LF mode
     * Setting SMCLK to 64Khz */
    MAP_CS_setReferenceOscillatorFrequency(CS_REFO_128KHZ);
    MAP_CS_initClockSignal(CS_MCLK, CS_REFOCLK_SELECT, CS_CLOCK_DIVIDER_1);
    MAP_CS_initClockSignal(CS_SMCLK, CS_REFOCLK_SELECT, CS_CLOCK_DIVIDER_2);
    MAP_PCM_setPowerState(PCM_AM_LF_VCORE0);

    /* Configuring GPIO2.4 as peripheral output for PWM  and P6.7 for button
     * interrupt */
    MAP_GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P2, GPIO_PIN4,
            GPIO_PRIMARY_MODULE_FUNCTION);
    MAP_GPIO_setAsInputPinWithPullUpResistor(GPIO_PORT_P1, GPIO_PIN1);
    MAP_GPIO_clearInterruptFlag(GPIO_PORT_P1, GPIO_PIN1);
    MAP_GPIO_enableInterrupt(GPIO_PORT_P1, GPIO_PIN1);

    /* Configuring Timer_A to have a period of approximately 500ms and
     * an initial duty cycle of 10% of that (3200 ticks)  */
    MAP_Timer_A_generatePWM(TIMER_A0_MODULE, &pwmConfig);

    /* Enabling interrupts and starting the watchdog timer */
    MAP_Interrupt_enableInterrupt(INT_PORT1);
    MAP_Interrupt_enableSleepOnIsrExit();
    MAP_Interrupt_enableMaster();

    /* Sleeping when not in use */
    while (1)
    {
        MAP_PCM_gotoLPM0();
    }
}

/* Port1 ISR - This ISR will progressively step up the duty cycle of the PWM
 * on a button press
 */
void port1_isr(void)
{
    uint32_t status = MAP_GPIO_getEnabledInterruptStatus(GPIO_PORT_P1);
    MAP_GPIO_clearInterruptFlag(GPIO_PORT_P1, status);

    if (status & GPIO_PIN1)
    {
        if(pwmConfig.dutyCycle == 28800)
            pwmConfig.dutyCycle = 3200;
        else
            pwmConfig.dutyCycle += 3200;

        MAP_Timer_A_generatePWM(TIMER_A0_MODULE, &pwmConfig);
    }
}