单片机求一个串口实验的C语言程序代码

#include <AT89X51.H>//单片机51头文件,存放着单片机的寄存器

unsigned char dat//用于存储单片机接收发送缓冲寄存器SBUF里面的内容

sbit gewei=P2^2//个位选通定义

sbit shiwei=P2^3//十位选通定义

unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x67,0x77,0x7c,0x39,0x5e,0x79,0x71}

//{0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x67,}// 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

void Delay(unsigned int tc) //延时程序

{

while( tc != 0 )

{unsigned int i

for(i=0i<100i++)

tc--}

}

void LED() //LED显示接收到的数据

{

shiwei=0

P0=~table[dat/16]

Delay(8)

shiwei=1

gewei=0

P0=~table[dat%16]

Delay(5)

gewei=1

}

void Init_Com(void)//功能:串口初始化,波特率9600，方式1

{

TMOD = 0x20

PCON = 0x00

SCON = 0x50

TH1 = 0xFd

TL1 = 0xFd

TR1 = 1

}

void main()//主程序功能:实现接收数据并把接收到的数据原样发送回去///////

{

Init_Com()//串口初始化

// P1=0xf0

while(1)

{

if ( RI ) //扫描判断是否接收到数据，

{

dat = SBUF //接收数据SBUF赋与dat

RI=0 //RI清零。

SBUF = dat //在原样把数据发送回去

}

LED()//显示接收到的数据

}

}

#include"reg51.h"

#define uint unsigned int

#define uchar unsigned char

void init()

void display(uchar,uchar,uchar,uchar,uchar,uchar)

sbit wela=P2^7

sbit dula=P2^6

sbit key0=P3^4

sbit key1=P3^5

sbit key2=P3^6

sbit key3=P3^7

uchar aa,bb,cc,bai,shi,ge

uchar code table[]={

0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71}

uchar temp1=0,temp2=0,temp3=0

void delay(uint z)

{

uint x,y

for(x=0x<zx++)

for(y=0y<110y++)

}

void main()

{

init()

while(1)

{

display(aa,bb,cc,bai,shi,ge)

if(key0!=1)

{

delay(5)

if(key0!=1)

{

while(!key0)

display(aa,bb,cc,bai,shi,ge)

temp3++

if(temp3==24)

temp3=0

}

}

if(key1!=1)

{

delay(5)

if(key1!=1)

{

while(!key1)

display(aa,bb,cc,bai,shi,ge)

temp2++

if(temp2==60)

temp2=0

}

}

if(key3!=1)

{

delay(5)

if(key3!=1)

{

temp1=0temp2=0temp3=0

}

}

if(key2!=1)

{

delay(5)

if(key2!=1)

{

temp1=0

}

}

}

}

void init()

{

TMOD=0x01

TH0=(65536-50000)/256

TL0=(65536-50000)%256

EA=1

ET0=1

TR0=1

}

void timer0() interrupt 1

{

uchar a

TH0=(65536-50000)/256

TL0=(65536-50000)%256

a++

if(a==19)

{

a=0

aa=temp3/10

bb=temp3%10

cc=temp2/10

bai=temp2%10

shi=temp1/10

ge=temp1%10

temp1++

if(temp1==60)

{

temp1=0

temp2++

if(temp2==60)

{

temp2=0

temp3++

if(temp3==24)

{

temp1=0temp2=0temp3=0

}

}

}

}

}

void display(uchar aa,uchar bb,uchar cc,uchar bai,uchar shi,uchar ge) //显示子函数

{

dula=1

P0=table[aa]

dula=0

P0=0xff

wela=1

P0=0xfe

wela=0

delay(1)

dula=1

P0=table[bb]

dula=0

P0=0xff

wela=1

P0=0xfd

wela=0

delay(1)

dula=1

P0=table[cc]

dula=0

P0=0xff

wela=1

P0=0xfb

wela=0

delay(1)

dula=1

P0=table[bai]

dula=0

P0=0xff

wela=1

P0=0xf7

wela=0

delay(1)

dula=1

P0=table[shi]

dula=0

P0=0xff

wela=1

P0=0xef

wela=0

delay(1)

dula=1

P0=table[ge]

dula=0

P0=0xff

wela=1

P0=0xdf

wela=0

delay(1)

}

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