MSP430 IR Detection

lab5.c

#include "msp430x22x4.h"

/*
  Main program: entry point
*/

void delay (void)
{
	int i;
	i = 30000;                          // SW Delay
	do i--;
	while (i != 0); 
}

int main (void)
{
	int gothit = -1;
	int i;
	
	WDTCTL = WDTPW + WDTHOLD; /* turn off watchdog */

  	P1DIR |= 0x03;       // set red and green led for output
  	P1REN |= 0x04;       // connect resistor to switch
  	P2DIR |= 0x08;
  	P2OUT |= 0x08;
  	P2REN |= 0x16;
  	P1IE  |= 0x04;       // Enable switch as interrupt
  	P1IFG |= 0x04;       // Set interrupt flag to 1 for switch
  	P1IES |= 0x04;       // Set intterupt select high to low edge
  	
  	//ADC stuff
  	ADC10CTL0 = SREF_1 + ADC10SHT_2 + REFON + ADC10ON + ADC10IE;
	  TACCR0 = 30;                              // Delay to allow Ref to settle
	  TACCTL0 |= CCIE;                          // Compare-mode interrupt.
	  TACTL = TASSEL_2 + MC_1;                  // TACLK = SMCLK, Up mode.
	  __bis_SR_register(CPUOFF + GIE);          // LPM0, TA0_ISR will force exit
	  TACCTL0 &= ~CCIE;                         // Disable timer Interrupt
	  ADC10AE0 |= 0x01;                         // P2.0 ADC option select
  	
  	P2OUT ^= 0x08;

	__enable_interrupt(); // enable all interrupts
  	
//  	while (1) {
//  		//P2OUT ^= 0x08;                      // Toggle P1.0 using exclusive-OR
//
//		if (P2IN & 0x16) {
//			P1OUT ^= 0x02;
//			i = 10000;                          // SW Delay
//		    do i--;
//		    while (i != 0); 
//		}			
//	}
	while(1) {
		ADC10CTL0 |= ENC + ADC10SC;             // Sampling and conversion start
	    __bis_SR_register(CPUOFF + GIE);        // LPM0, ADC10_ISR will force exit
	    if (ADC10MEM < 0x3FC /*0x3E8*/) {              // ADC10MEM = A0 > 1.65V?
	      P1OUT &= ~0x01;                       // Clear P1.0 LED off
	      P1OUT |= 0x02;
	      gothit++;
		  for (i = 0; i < gothit; i++) {
		  	P1OUT |= 0x01;                        // Set P1.0 LED on
		    delay();
		   	P1OUT &= ~0x01;
		    delay();
		  }
		  P1OUT &= ~0x02;
		  delay();
	    }
//	    } else {
//	    	//P1OUT &= ~0x02;
//	    }
	}
}

// Port 2 interrupt service routine
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
P2OUT ^= 0x08; //Toggle laser state
P1IFG &= ~0x04; // Toggle interrupt edge
P1IES ^= 0x04;
}

// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
  __bic_SR_register_on_exit(CPUOFF);        // Clear CPUOFF bit from 0(SR)
}

#pragma vector=TIMERA0_VECTOR
__interrupt void TA0_ISR(void)
{
  TACTL = 0;
  LPM0_EXIT;                                // Exit LPM0 on return