delay.c

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#include<reg52.h>
#define unit unsigned int 
sbit P30=P3^0;
sbit P10=P1^0;
int a[4]={0xfe,0xfd,0xfb,0xf7};
int c[]={'a','b','c','d'};	//转为ASCII{0X61，0X62，0X63，0X64}
int *b;
void main()
{
int i;
void run(int a[]);
void delay(int i);		    
b=a;
while(1)
{
delay(8000);
run(a+i);
P0=c[i];
i++;
P2=*b;
b++;
P10=~P10;
if(i==4)
{b=a;
i=0;						 
}}
}
void delay(int k)
{
int i,j;
for(i=0;i<k;i++)

for(j=0;j<121;j++)
{;;}
}
void run(int *point)
{
//int j=0;
*b=*point;
P30=~P30;
}