2-bit couner (button demo)

/*
 * ButtonTest by James Trimble, Capt, USAF
 * USAFA ECE Automata Club
 * Description: Uses polling to detect button presses, then increments a 2-bit counter
 * which is displayed on the on-board LEDs tied to P1.0 and P1.6
 */

#include <msp430.h> 

/*
 * main.c
 */
int main(void) {
    WDTCTL = WDTPW | WDTHOLD;	// Stop watchdog timer
	
    P1DIR |= 0x41; // Configure P1.0 and P1.6 for output
    P1DIR &= ~0x08; // Configure P1.3 for input
    P1REN |= 0x08; // Enable the resistor for P1.3

    char counter = 0x00;

    while (1==1) {
    	if (!(P1IN & 0x08)) { // If bit 3 is low
    		int i = 0;
    		for (i; i < 10000; i++); // Delay for debouncing
    		if (!(P1IN & 0x08)) { // If bit 3 is low
    			counter++;
    			if (counter == 4) {
    				counter = 0;
    			}
    	    	if (counter & 0x02) { // If bit 1 is set
    	    		P1OUT |= 0x01; // Turn on bit 0
    	    	}
    	    	else {
    	    		P1OUT &= ~0x01; // Turn off bit 0
    	    	}


    	    	if (counter & 0x01) { // If bit 0 is set
    	    		P1OUT |= 0x40; // Turn on bit 6
    	    	}
    	    	else {
    	    		P1OUT &= ~0x40; // Turn off bit 6
    	    	}
    		}
    		// wait for the button to be released
    		while (!(P1IN & 0x08));
    	}

    }
	return 0;
}

Code might be slightly clearer:

P1DIR |= BIT6 | BIT0; // Configure P1.0 and P1.6 for output

Could use that throughout. No change in functionality, but maybe a little more readable.

I agree. I'll rewrite it to make it more clear.