#include <msp430g2231.h>
#include <stdint.h>

enum event_type {
	EVENT_NONE = 0,
	EVENT_PWM1_ON,
	EVENT_PWM2_ON,
	EVENT_PWM1_OFF,
	EVENT_PWM2_OFF,
};

struct event {
	uint8_t time;
	enum event_type type;
};

static struct event events[] = {
	{ .time = 0, .type = EVENT_PWM1_ON, },
//	{ .time = 0, .type = EVENT_PWM2_ON, },
	{ .time = 1, .type = EVENT_PWM1_OFF, },
//	{ .time = 20, .type = EVENT_PWM2_OFF, },
	{ .time = 0, .type = EVENT_NONE, },
};

int main(void) {
	uint8_t i = 0;
	WDTCTL = WDTPW | WDTHOLD;
	P1DIR = BIT0 | BIT6;
	P1OUT = BIT0;
	TACCTL0 = CCIE;
	_BIS_SR(GIE);
	TACTL = TASSEL_2 | MC_2 | ID_3;
	TACCR0 = 100;
//	_BIS_SR(CPUOFF + GIE);
	while (1) {
		__delay_cycles(20000);
		--events[1].time;
	}
	return 0;
}

static inline void timer_event(struct event *event)
{
	switch(event->type) {
	case EVENT_PWM1_ON:
		P1OUT |= BIT0;
		break;
	case EVENT_PWM1_OFF:
		P1OUT &= ~BIT0;
		break;
	case EVENT_PWM2_ON:
		P1OUT |= BIT6;
		break;
	case EVENT_PWM2_OFF:
		P1OUT &= ~BIT6;
		break;
	default:
		break;
	}
}

#pragma vector=TIMERA0_VECTOR
__interrupt void timera_intr(void)
{
	static uint8_t i = 0;

	if (events[i].type == EVENT_NONE)
		i = 0;
	if (i == 0)
		TAR = 0;
found_event:

	timer_event(&events[i]);

	++i;
	if (events[i].type != EVENT_NONE && events[i].time <= TAR) {
		goto found_event;
	}
	if (events[i].type == EVENT_NONE) {
		TACCR0 = 255 + events[0].time;
	} else {
		TACCR0 = events[i].time;
	}
}