MSP432 Driverlib

/*
 * -------------------------------------------
 *    MSP432 DriverLib - v2_20_00_08 
 * -------------------------------------------
 *
 * --COPYRIGHT--,BSD,BSD
 * Copyright (c) 2014, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
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 *
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 *    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,
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 * --/COPYRIGHT--*/
/*******************************************************************************
 * MSP432 Toggle P1.0, Up Mode, LFXT ACLK
 *
 * Description: Toggle P1.0 using software and TA_0 ISR. Timer0_A is
 * configured for up mode, thus the timer overflows when TAR counts
 * to CCR0. In this example, CCR0 is loaded with 130 which makes the LED
 * toggle every four milliseconds..
 * ACLK = 32 kHz, MCLK = SMCLK = default DCO ~1MHz
 * TACLK = ACLK
 *
 *         MSP432P401
 *      -------------------
 *  /|\|                   |
 *   | |                   |
 *   --|RST                |
 *     |                   |
 *     |               P1.0|-->LED
 *     |                   |
 *
 * Author: Timothy Logan
 * Modifier: Ryan Brown
*******************************************************************************/
/* DriverLib Includes */
#include "driverlib.h"

/* Application Defines  */
#define TIMER_PERIOD    130

/* Timer_A UpMode Configuration Parameter */
const Timer_A_UpModeConfig upConfig =
{
        TIMER_A_CLOCKSOURCE_ACLK,               // ACLK Clock Source
        TIMER_A_CLOCKSOURCE_DIVIDER_1,          // ACLK/1 = 32 kHz
        TIMER_PERIOD,                           // 4 ms period
        TIMER_A_TAIE_INTERRUPT_DISABLE,         // Disable Timer interrupt
        TIMER_A_CCIE_CCR0_INTERRUPT_ENABLE ,    // Enable CCR0 interrupt
        TIMER_A_DO_CLEAR                        // Clear value
};

int main(void)
{
    /* Stop WDT  */
    MAP_WDT_A_holdTimer();

    /* Configuring P1.0 as output */
    MAP_GPIO_setAsOutputPin(GPIO_PORT_P1, GPIO_PIN0);
    MAP_GPIO_setOutputLowOnPin(GPIO_PORT_P1, GPIO_PIN0);

    /* Initializing ACLK to LFXT (effectively 32khz) */
    MAP_CS_initClockSignal(CS_ACLK, CS_LFXTCLK_SELECT, CS_CLOCK_DIVIDER_1);

    /* Configuring Timer_A1 for Up Mode */
    MAP_Timer_A_configureUpMode(TIMER_A1_MODULE, &upConfig);

    /* Enabling interrupts and starting the timer */
    MAP_Interrupt_enableSleepOnIsrExit();
    MAP_Interrupt_enableInterrupt(INT_TA1_0);
    MAP_Timer_A_startCounter(TIMER_A1_MODULE, TIMER_A_UP_MODE);
    
    /* Enabling MASTER interrupts */
    MAP_Interrupt_enableMaster();  

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

void timer_a_0_isr(void)
{
    MAP_GPIO_toggleOutputOnPin(GPIO_PORT_P1, GPIO_PIN0);
    MAP_Timer_A_clearCaptureCompareInterrupt(TIMER_A1_MODULE,
            TIMER_A_CAPTURECOMPARE_REGISTER_0);
}