#include "msp430.h"
#include "in430.h"

const unsigned int FAST = 5000;
const unsigned int SLOW = 15000;

void toggleLeds(int,int,unsigned int);

int main(void)
{
    WDTCTL = WDTPW + WDTHOLD; // init watchdog timer to off

    P1DIR |= 0x03; // set LED output to P1.0 and P1.1
    // similar: P1DIR |= BIT0 + BIT1;

    P1OUT |= BIT0 + BIT1; // turn on LEDs

    P1DIR &= ~0x04; // set P1.2 as input
    P1REN |=  0x04; // enable resistor on P1.2
    P1IE  |=  0x04; // enable interrupts on P1.2

    // set up Timer A
    BCSCTL3 |= LFXT1S_2;        // ACLK on sourced to the VLO
    TACCTL0 = CCIE;             // enable interrupts for Timer A

    __bis_SR_register( GIE + LPM3_bits ); // enable interrupts and sleep
                                          // (LPM3 leaves only ACLK running)
}

#pragma vector=PORT1_VECTOR    // button ISR
interrupt void Port_1 ( void )
{
    toggleLeds(5,FAST,BIT0+BIT1); // blink both LEDs fast to signal button ISR
    P1OUT |= 0x03;  // turn on LEDs

    // restart the timer
    TAR = 0;                    // reset the counter
    TACCR0 = 48000;             // set the count up value: approx. 4s
                                // (VLO around 12kHz) * 2 (ID_1) = 8s
    TACTL = MC_1+TASSEL_1+ID_1; // Timer A count up (MC_1) using
                                // ACLK (TASSEL_1) divided by 2 (ID_1)
    P1IFG &= ~0x04; // clear interrupt flag
}

#pragma vector=TIMERA0_VECTOR    // Timer A ISR
interrupt void Timer_A ( void )
{
    TACTL = MC_0;       // timer halted

    P1OUT &= ~0x03;     // turn off LEDs
    toggleLeds(10,SLOW,BIT0); // blink 	red LED slow
    P1OUT &= ~0x03;     // turn off LEDs
}

void toggleLeds (int howMany, int timeout, unsigned int leds )
{
    int i,j = 0;
    // to get some blinking for sure
    if(howMany == 1) {
        howMany = 2;
    }
    for ( j=0; j<howMany; j++) {

        P1OUT ^= leds;  // toggle LEDs
        for ( i=0; i<timeout; i++) {
            __no_operation();
        }
    }
    P1OUT &= ~leds; // turn off LEDs
}

void toggleBothLeds (int howMany, int timeout )
{
    int i,j = 0;
    // to get some blinking for sure
    if(howMany == 1) {
        howMany = 2;
    }
    for ( j=0; j<howMany; j++) {

        P1OUT ^= 0x03;  // toggle LEDs
        for ( i=0; i<timeout; i++) {
            __no_operation();
        }

        P1OUT &= ~0x01; // turn off one LED
        for ( i=0; i<timeout; i++) {
            __no_operation();
        }
    }
}