point-p.c

口若悬河口若悬河口若悬河口若悬河口若悬河口若悬河口若悬河口若悬河口若悬河

#include <reg52.h>
bit tm21s=0;
void main()
{
void delay(unsigned char i);
void init();
unsigned char a[4]={0xfe,0xfd,0xfb,0xf7};
unsigned char *p[4]={&a[0],&a[1],&a[2],&a[3]};
unsigned char i,**b;
b=p;
init();	  //调用初始化
while(1)
if(tm21s)
{
tm21s=0;
P0=**b;
b++;
i++;
if(i==4){i=0;b=p;}
}
}
//**初始化T2，自动重装，50MS中断一次 **//
void init()
{
T2CON=0x04;
RCAP2H=0x3c;RCAP2L=0xb0;
ET2=1;
EA=1;
}
//**中断入口，1秒设置**//
timer2() interrupt 5
{
unsigned char t;
t++;
if(t==50)
{t=0;
tm21s=1;
}}