Displays the binary representation of an unsigned char using an MSP430

main.c

//
//  main.c
//  BlinkingLEDs
//
//  Created by David Roberts on 30/06/2011.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#include <io.h>


int main (void)
{	
    // disable the watchdog timer
    WDTCTL = WDTPW + WDTHOLD;
	
    unsigned char value = 5;
    unsigned char mask = 128;
    
    // all pins in off state
    P1OUT = 0;
    
    // set pins 0, 5, 6 as outputs
    P1DIR |= BIT0;
    P1DIR |= BIT6;
    P1DIR |= BIT5;
    
    // display starting LED 
    P1OUT = 32; 
    volatile unsigned int i;
    for (i=0; i<60000; i++);
    
    // flash off
    P1OUT = 0;
    for (i=0; i<60000; i++);
    
    // iterate through each bit in value, comparing to mask
    for (i=0; i<8; i++) {
        
        // set red/white to display if 1/0
        if ((value & mask) == mask){
            P1OUT |= 1;
        }
        else {
            P1OUT |= 64;
        }
        
        // shift mask along to compare next bit
        mask = mask >> 1;
        
        // display bit LED
        volatile unsigned int j;        
        for(j=0; j<60000; j++);
        
        // flash off
        P1OUT = 0;
        for (j=0; j<60000; j++);
    }
    
    // display ending LED
    P1OUT = 32; 
    for (i=0; i<60000; i++);
    P1OUT = 0;
    
    
    while(1);
    return 0;
}