两个51相互之间单片机如何进行串口通信

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只进行发送是数据的单片机
 1 #include<reg52.h>
 2 #define unit unsigned int 
 3 #define uchar unsigned char 
 4 
 5 sbit key=P3^7;
 6 
 7 /*void delayms(unit xms)
 8 {
 9     unit i,j;
10     for(i=xms;i>0;i--)
11        for(j=580;j>0;j--);
12 } */
13 
14 void send(uchar date)
15 {
16     SBUF=date;
17     while(!TI);
18     TI=0;
19 }
20 
21 void chuaninit()
22 {
23     TMOD=0X20;
24     TH1=0Xfd;
25     TL1=0Xfd;
26     SM0=0;
27     SM1=1;
28     ES=1;
29     EA=1;
30     TR1=1;
31 }
32 
33 void key1()
34 {
35     uchar d;
36     if(key==0)
37     {
38         d=2;
39         send(d);
40     }
41     else
42     {
43         d=4;
44         send(d);
45     }    
46 }
47 
48 void main()
49 {
50     chuaninit();
51     while(1)
52     {
53         key1();
54     }
55         
56 }

只进行数据接受的单片机
 1 #include<reg52.h>
 2 #define unit unsigned int 
 3 #define uchar unsigned char 
 4 typedef unsigned char u8;
 5 
 6 sbit led=P3^7;
 7 sbit LSA=P2^2;
 8 sbit LSB=P2^3;
 9 sbit LSC=P2^4;
10 
11 u8 code smgduan[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
12                     0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};//显示0~F的值
13 
14 void chuaninit()
15 {
16     TMOD=0X20;
17     TH1=0Xfd;
18     TL1=0Xfd;
19     SM0=0;
20     SM1=1;
21     REN=1;
22     ES=1;
23     EA=1;
24     TR1=1;
25 }
26 
27 void display(uchar num)
28 {
29     LSA=1;
30     LSB=1;
31     LSC=1;
32     P0=smgduan[num];
33 }
34 
35 
36 void main()
37 {
38     chuaninit();
39     LSA=1;
40     LSB=1;
41     LSC=1;
42     P0=smgduan[3];
43     while(1);
44 }
45 
46 void chuan() interrupt 4
47 {
48     uchar a;
49     RI=0;
50     a=SBUF;
51     display(a);
52 }