#include<iocc2530.h>
#define uchar unsigned char
#define uint unsigned int
#define LED1 P1_0

void Initial(void)
{
  P1DIR|=0X01;
  P1&=~0X01;
}

void Delay(uint time)
{
  while(time--);
}

void ON_OFF_LED(uint CYCLE , uint PWM_LOW)
{
  LED1=1;
  Delay(CYCLE);
  Delay(PWM_LOW);
  LED1=0; 
}

main()
{
  uint CYCLE=600,PWM_LOW=0;
  Initial();
  while(1)
  {    
    //明到暗
    for(PWM_LOW=0;PWM_LOW<CYCLE;PWM_LOW++)
    {
      ON_OFF_LED(CYCLE-PWM_LOW , PWM_LOW);
    }
    //暗到明
    for(PWM_LOW=CYCLE;PWM_LOW>0;PWM_LOW--)
    {
      ON_OFF_LED(CYCLE-PWM_LOW , PWM_LOW);        
    }   
  }
}