MSP430 PWM

#include "msp430.h"

#define INC 20
#define MIN 1000
#define MAX 7000

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;
  P1DIR |= 0x01;

  unsigned int pwm = MIN;
  int UP = 1;

  for (;;)
  {
    unsigned int i;

    if (pwm <= MIN)
      {UP = 1;}
    if (pwm >= MAX)
      {UP = 0;}

    if (UP == 1)
      {pwm = pwm + INC;}
    if (UP == 0)
      {pwm = pwm - INC;}

    P1OUT ^= 0x01;

    for (i=pwm ; i!=0 ; i--);
  }
}