单片机双机通信问题

只看该作者 · 2015-11-15 11:22

将两个单片机的TXD RXD交叉连接 GND共地后，按一个单片机的键盘，另一个单片机显示数字，下面是自己写的程序，实现不了这个功能，求大神指导
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit wela=P2^7;
sbit dula=P2^6;
uchar flag;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71
};
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void init()
{
TMOD=0x20;
TH1=0xfd;
TL1=0xfd;
TR1=1;
SCON=0x50;
EA=1;
ES=1;
}
void display(uchar num)
{
P0=table[num];
dula=1;
dula=0;
}
void send(uchar key_num)
{
while(1)
{
if(flag==1)
{
flag=0;
ES=0;
TI=1;
SBUF=key_num;
while(!TI);
TI=0;
ES=1;
}
}
}
void keyscan()
{
uchar key,temp;
P3=0xfe;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
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);
}
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
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);
}
}
P3=0xfb;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
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);
}
}
P3=0xf7;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
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()
{
init();
P0=0xc0;
wela=1;
wela=0;
while(1)
{
keyscan();
}
}
void ser() interrupt 4
{
uchar a;
RI=0;
a=SBUF;
flag=1;
display(a);
}