MSP 430 - Number Counter Led 0.1

/*
--------------------------------
  MSP 430
  Number Counter on Led 0.1
  Software developed by: Utroz(Raphael) and Kaddoush(Pablo)
  Blog: http://oakcoders.blogspot.com/
--------------------------------
*/

#include "io430.h"

/* Bit 0x01 = LED_RED */
#define LED_RED 0x01

/* Bit 0x02 = LED_GREEN */
#define LED_GREEN 0x02

/* Padrões de Decremento */
#define COUNT_RED 0x0A
#define COUNT_GREEN 0x01

/* Valores padrões */
#define TIME 0xEA60
#define NULL 0x00

/* Tempo de Espera */
void delay_time(volatile unsigned int i)
{
    do (i--);
    while (i != NULL);
}

/* Inicializa Led Red */
void start_led_red(void)
{
        /* Porta respectiva ao Led Red */
        P1DIR |= LED_RED;

        /* Sobrecarga XOR na porta (Liga). */
        P1OUT ^= LED_RED;
        delay_time(TIME);

        /* Sobrecarga XOR na porta (Desliga). */
        P1OUT ^= LED_RED;
        delay_time(TIME);
}

/* Inicializa Led Green */
void start_led_green(void)
{
         /* Porta respectiva ao Led Green */
        P1DIR |= LED_GREEN;

        /* Sobrecarga XOR na porta (Liga). */
        P1OUT ^= LED_GREEN;
        delay_time(TIME);

        /* Sobrecarga XOR na porta (Desliga). */
        P1OUT ^= LED_GREEN;
        delay_time(TIME);
}

void main(void)
{
        unsigned short int x;

        //Valor de entrada.
        x = 52;

        // Desativa o WatchDog Timer.
    WDTCTL = WDTPW + WDTHOLD;

        do
        {
        while(x >= COUNT_RED)
            {
                    /* Chama a função do Led Red */
                    start_led_red();
                    x-= COUNT_RED;
        }
            /* Desliga a porta do Led */
            P1DIR &= NULL;

            while(x > (COUNT_GREEN-1))
            {
                    /* Chama a função do Led Green */
                    start_led_green();
                    x-= COUNT_GREEN;
        }
            /* Desliga a porta do Led */
            P1DIR &= NULL;
        } while(x > NULL);
}