MSP432 DriverLib Timer Interrupts

// Includes
#include "driverlib.h"

// Macros
#define main_BUTTON_PORT	(GPIO_PORT_P1)
#define main_BUTTON_PIN		(GPIO_PIN1)
#define main_GREEN_PORT		(GPIO_PORT_P2)
#define main_GREEN_PIN		(GPIO_PIN1)
#define main_RED_PORT		(GPIO_PORT_P1)
#define main_RED_PIN		(GPIO_PIN0)

#define main_TIMER_ONEMIN_MODULE		(TIMER_A0_MODULE)
#define main_TIMER_ONEMIN_CLOCK			(TIMER_A_CLOCKSOURCE_SMCLK)
#define main_TIMER_ONEMIN_CLOCKDIVIDER		(TIMER_A_CLOCKSOURCE_DIVIDER_64)
#define main_TIMER_ONEMIN_PERIOD		(58594) // Assumes 62.5kHz clock with divider of 64
#define main_TIMER_QUARTERSEC_MODULE		(TIMER_A1_MODULE)
#define main_TIMER_QUARTERSEC_CLOCK		(TIMER_A_CLOCKSOURCE_SMCLK)
#define main_TIMER_QUARTERSEC_CLOCKDIVIDER	(TIMER_A_CLOCKSOURCE_DIVIDER_1)
#define main_TIMER_QUARTERSEC_PERIOD		(15625) // Assumes 62.5kHz clock with divider of 1
#define main_TIMER_ONESEC_MODULE		(TIMER_A2_MODULE)
#define main_TIMER_ONESEC_CLOCK			(TIMER_A_CLOCKSOURCE_SMCLK)
#define main_TIMER_ONESEC_CLOCKDIVIDER		(TIMER_A_CLOCKSOURCE_DIVIDER_1)
#define main_TIMER_ONESEC_PERIOD		(62500) // Assumes 62.5kHz clock with divider of 1

// Local function definitions
void main_buttonInterruptHandler(void);
void main_oneMinuteInterruptHandler(void);
void main_oneSecondInterruptHandler(void);
void main_quarterSecondInterruptHandler(void);

int main(void) 
{
	Timer_A_UpModeConfig TimerConfig;

    WDT_A_holdTimer();

    // Configure SMCLK
    CS_setDCOFrequency(8000000); // Set DCO clock frequency to 8MHz
    CS_initClockSignal(CS_SMCLK, CS_DCOCLK_SELECT, CS_CLOCK_DIVIDER_128); // Set SMCLK to DCO/128 (62.5kHz)

    // Initialize timers and timer interrupts
    TimerConfig.captureCompareInterruptEnable_CCR0_CCIE = TIMER_A_CCIE_CCR0_INTERRUPT_DISABLE;
    TimerConfig.clockSource = main_TIMER_ONEMIN_CLOCK;
    TimerConfig.clockSourceDivider = main_TIMER_ONEMIN_CLOCKDIVIDER;
    TimerConfig.timerClear = TIMER_A_DO_CLEAR;
    TimerConfig.timerInterruptEnable_TAIE = TIMER_A_TAIE_INTERRUPT_DISABLE;
    TimerConfig.timerPeriod = main_TIMER_ONEMIN_PERIOD;
    Timer_A_configureUpMode(main_TIMER_ONEMIN_MODULE, &TimerConfig);

    TimerConfig.clockSourceDivider = main_TIMER_QUARTERSEC_CLOCKDIVIDER;
    TimerConfig.timerPeriod = main_TIMER_QUARTERSEC_PERIOD;
    Timer_A_configureUpMode(main_TIMER_QUARTERSEC_MODULE, &TimerConfig);

    TimerConfig.timerPeriod = main_TIMER_ONESEC_PERIOD;
    Timer_A_configureUpMode(main_TIMER_ONESEC_MODULE, &TimerConfig);

    Timer_A_registerInterrupt(main_TIMER_ONEMIN_MODULE, TIMER_A_CCR0_INTERRUPT, main_oneMinuteInterruptHandler);
    Timer_A_registerInterrupt(main_TIMER_ONESEC_MODULE, TIMER_A_CCR0_INTERRUPT, main_oneSecondInterruptHandler);
    Timer_A_registerInterrupt(main_TIMER_QUARTERSEC_MODULE, TIMER_A_CCR0_INTERRUPT, main_quarterSecondInterruptHandler);
    Timer_A_enableInterrupt(main_TIMER_ONEMIN_MODULE);
    Timer_A_enableInterrupt(main_TIMER_ONESEC_MODULE);
    Timer_A_enableInterrupt(main_TIMER_QUARTERSEC_MODULE);

    // Initialize LEDs
    GPIO_setAsOutputPin(main_GREEN_PORT, main_GREEN_PIN);
    GPIO_setAsOutputPin(main_RED_PORT, main_RED_PIN);
    GPIO_setOutputLowOnPin(main_GREEN_PORT, main_GREEN_PIN);
    GPIO_setOutputLowOnPin(main_RED_PORT, main_RED_PIN);

    // Initialize GPIO and interrupt for button
    GPIO_setAsInputPinWithPullUpResistor(main_BUTTON_PORT, main_BUTTON_PIN);
    GPIO_interruptEdgeSelect(main_BUTTON_PORT, main_BUTTON_PIN, GPIO_HIGH_TO_LOW_TRANSITION);
    GPIO_registerInterrupt(main_BUTTON_PORT, main_buttonInterruptHandler);
    GPIO_enableInterrupt(main_BUTTON_PORT, main_BUTTON_PIN);

    while(1);
}

void main_buttonInterruptHandler(void)
{
	if( GPIO_getInterruptStatus(main_BUTTON_PORT, main_BUTTON_PIN) )
	{
		GPIO_clearInterruptFlag(main_BUTTON_PORT, main_BUTTON_PIN);
		GPIO_toggleOutputOnPin(main_GREEN_PORT, main_GREEN_PIN);
		GPIO_toggleOutputOnPin(main_RED_PORT, main_RED_PIN);
	}
}

void main_oneMinuteInterruptHandler(void)
{
	GPIO_toggleOutputOnPin(main_GREEN_PORT, main_GREEN_PIN);
}

void main_oneSecondInterruptHandler(void)
{
	GPIO_toggleOutputOnPin(main_GREEN_PORT, main_GREEN_PIN);
}

void main_quarterSecondInterruptHandler(void)
{
	GPIO_toggleOutputOnPin(main_GREEN_PORT, main_GREEN_PIN);
}