cpu_1.c

用单片机控制74LS244做的串口通信系统。

//多机通信
//cpu_1.c
//包含头文件
#include<reg51.h>
//宏定义
#define uchar unsigned char
#define uint unsigned int
#define ADDRESS1 0x01
#define ADDRESS2 0x02
//延时子程序
delay()
{
 uint j;
 uchar k;
 for(j=0;j<50000;j++)
    for(k=0;k<10;k++);
}
//主程序
main()
{
SCON=0XD8;
PCON=0X80;
TMOD=0x20;
TH1=0xff;
TL1=0XFF;
TR1=1;
while(1)
{
TB8=1;
SBUF=ADDRESS1;
while(!TI);
TI=0;
P1=0XF9;
delay();
while(!RI);
RI=0;
if(SBUF==ADDRESS1)
{
TB8=0;
SBUF=0XF8;
while(!TI);
TI=0;
P0=0XF8;
delay();

}
TB8=1;
SBUF=ADDRESS2;
while(!TI);
TI=0;
P1=0XA4;
delay();
while(!RI);
RI=0;
if(SBUF==ADDRESS2)
{
 TB8=0;
SBUF=0X80;
while(!TI);
TI=0;
P0=0X80;
delay();

}
}
}