两单片机间的串口通信

单片机间的串口通信

注意：

将两单片机的RXD和TXD交叉连接，并GND共地...

程序功能：

发送单片机发送0至F 16字符在接收单片机数码管显示;

///发送单片机的程序
#include
 
void delay()  //X毫秒
{
 uint i,j;
 for(i=10;i>0;i--)
  for(j=110;j>0;j--);
}
 
void send(uchar key_num)
{
 
SBUF=key_num;
while(!TI);
TI=0;
}
 
void keyscan()
{
uchar temp,key;
P1=0xfe;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
  {
delay();
temp=P1;
temp=temp&0xf0;
 
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xee:
key=0;
break;
case 0xde:
key=1;
break;
case 0xbe:
key=2;
break;
case 0x7e:
key=3;
break;
}
while(temp!=0xf0)
{ temp=P3;
temp=temp&0xf0;
}
send(key);
}
}
 
P1=0xfd;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
  {
delay();
temp=P1;
temp=temp&0xf0;
 
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xed:
key=4;
break;
case 0xdd:
key=5;
break;
case 0xbd:
key=6;
break;
case 0x7d:
key=7;
break;
}
while(temp!=0xf0)
{ temp=P3;
temp=temp&0xf0;
}
send(key);
}
}
 
P1=0xfb;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
  {
delay();
temp=P1;
temp=temp&0xf0;
 
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xeb:
key=8;
break;
case 0xdb:
key=9;
break;
case 0xbb:
key=10;
break;
case 0x7b:
key=11;
break;
}
while(temp!=0xf0)
{ temp=P3;
temp=temp&0xf0;
}
send(key);
}
}
 
P1=0xf7;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
  {
delay();
temp=P1;
temp=temp&0xf0;
 
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xe7:
key=12;
break;
case 0xd7:
key=13;
break;
case 0xb7:
key=14;
break;
case 0x77:
key=15;
break;
}
while(temp!=0xf0)
{ temp=P3;
temp=temp&0xf0;
}
send(key);
}
}
 
 
}
 
void main()
{
TMOD=0x20;
TH1=0xfd;
TL1=0xfd;
TR1=1;
SM0=0;
SM1=1;
EA=1;
ES=1;
while(1)
{
keyscan();
}
 
}
 
 

接收单片机的程序

 

#include
 
#define uint unsigned int
#define uchar unsigned char
 
uchar code tabled[16]=
{0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
 
void display(uchar num)
{
P0=tabled[num];  //数码管段选  P0口；
P2=0;          //数码管位选；
}
 
void main()
{
TMOD=0x20;
TH1=0xfd;
TL1=0xfd;
TR1=1;
REN=1;
SM0=0;
SM1=1;
EA=1;
ES=1;
while(1);
 
}
 
void ser() interrupt 4
{
uchar a;
RI=0;
a=SBUF;
display(a);
}