rtc_ex1_countmode.c

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/* --COPYRIGHT--,BSD
 * Copyright (c) 2017, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
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 *
 * *  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.
 *
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 *    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,
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//******************************************************************************
//******************************************************************************
#include "driverlib.h"
#include "Board.h"
 
//*****************************************************************************
//
//Interval time used for RTC
//
//*****************************************************************************
#define INTERVAL_TIME 32768
 
void main (void)
{
    WDT_A_hold(WDT_A_BASE);
 
    //Set LED1 to output direction
    GPIO_setAsOutputPin(
        GPIO_PORT_LED1,
        GPIO_PIN_LED1
        );
 
    /*
     * Disable the GPIO power-on default high-impedance mode to activate
     * previously configured port settings
     */
    PMM_unlockLPM5();
 
    //Set DCO FLL reference = REFO
    CS_initClockSignal(
        CS_FLLREF,
        CS_REFOCLK_SELECT,
        CS_CLOCK_DIVIDER_1
        );
 
    //Set SMCLK = REFO
    CS_initClockSignal(
        CS_SMCLK,
        CS_REFOCLK_SELECT,
        CS_CLOCK_DIVIDER_1
        );
 
    //Initialize RTC
    RTC_init(RTC_BASE,
        INTERVAL_TIME,
        RTC_CLOCKPREDIVIDER_1);
 
    RTC_clearInterrupt(RTC_BASE,
        RTC_OVERFLOW_INTERRUPT_FLAG);
 
    //Enable interrupt for RTC overflow
    RTC_enableInterrupt(RTC_BASE,
        RTC_OVERFLOW_INTERRUPT);
 
    //Start RTC Clock with clock source SMCLK
    RTC_start(RTC_BASE, RTC_CLOCKSOURCE_SMCLK);
 
    //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_ISR (void)
{
    switch (__even_in_range(RTCIV,2)){
        case 0: break;  //No interrupts
        case 2:         //RTC overflow
            //Toggle LED1
            GPIO_toggleOutputOnPin(
            GPIO_PORT_LED1,
            GPIO_PIN_LED1);
            break;
        default: break;
    }
}