slavr935.c

单片机开发资料光盘-双龙-686M.zip

#include <io8515.h>
#define BIT(x)	(1 << (x))
void delay(unsigned char t)
{
 unsigned char i;
 unsigned char j;
 for (i=0;i<t;i++)
   for(j=1;j;j++);
}            
void led_pb(unsigned char t)
{
 unsigned char i;
   DDRB=0xff;
    for (i=0;i<8;i++)
      {
       PORTB=~BIT(i);
       delay(t);
      }
   PORTB=0xff;   
}
void led_pd(unsigned char t)
{
 unsigned char i;
   DDRD=0xff;
    for (i=0;i<8;i++)
      {
       PORTD=~BIT(i);
       delay(t);
      }
   PORTD=0xff;   
}
void led_pc(unsigned char t)
{
 unsigned char i;
   DDRC=0xff;
    for (i=0;i<8;i++)
      {
       PORTC=~BIT(i);
       delay(t);
      }
   PORTC=0xff;   
}
void led_pa(unsigned char t)
{
 unsigned char i;
   DDRA=0xff;
    for (i=8;i>0;i--)
      {
       PORTA=~BIT(i-1);
       delay(t);
      }
   PORTA=0xff;   
}
void main (void) 
{
 unsigned char dt;
    while (1)
    {
      for (dt=5;dt<200;dt+=25)
        {
         led_pb(dt);
         led_pd(dt);
         led_pc(dt);
         led_pa(dt);
        } 
    } 
}