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单片机51系列测试串口的简单程序反回输入字符

#include <AT89X51.H>
#include <stdio.h>
#include <stdlib.h>
#include "LCD.h"

void delay(unsigned long time);
extern char code pic[];


void LCDHalf()
{
	unsigned char i,j;
	for(i=0;i<4;i++)
	{
		LCDWriteCom1(0xb8|i);
		LCDWriteCom2(0xb8|i);
		LCDWriteCom1(0);
		LCDWriteCom2(0);
		for(j=0;j<60;j++)
			{
				LCDWriteDat1(j);
				LCDWriteDat2(j);

			}
					
	}

}
char code CHARSHAPE[]={
					0xfa,0x11,0x11,0xfa,      //A
					0xfd,0x92,0x92,0x6c,		//B
					0x7c,0x82,0x82,0x44,		//C
					0xfd,0xc6,0xc6,0x7c,	

						};
void LCDShowChar(char x0,char page,char ch)
{
	char j,x1;
	char code *pChrShp;
	x1=x0+3;	//字符宽度
	ch=ch-65;
	pChrShp=CHARSHAPE;
	LCDWriteCom1(0xb8|(page&3));	//社定字符显示页
	LCDWriteCom2(0xb8|(page&3));
	if(x0<60&&x1<60)
			LCDWriteCom1(x0);	
		else if(x0<60)
		{	
			LCDWriteCom1(x0);
			LCDWriteCom2(0);
		}
		else if(x0>=60)
			LCDWriteCom2(x0-60);
	   	for(j=x0;j<=x1;j++)
		{
			if(j<60)LCDWriteDat1(*(pChrShp+(j-x0)));
			else LCDWriteDat2(*(pChrShp+(j-x0)));
				
		}

		


}
void LCDDisp(char x0,char x1,char page0,char page1,char code *pic)
{
	char i,j;
	char w;
	for(i=page0;i<=page1;i++)
	{
		LCDWriteCom1(0xb8|i);
		LCDWriteCom2(0xb8|i);
		if(x0<60&&x1<60)
				LCDWriteCom1(x0);	
			else if(x0<60)
			{	
				LCDWriteCom1(x0);
				LCDWriteCom2(0);
			}
			else if(x0>=60)
				LCDWriteCom2(x0-60);
			w=x1-x0;	
		for(j=x0;j<=x1;j++)
		{
			if(j<60)LCDWriteDat1(*(pic+(j-x0)+(i-page0)*w));
			else LCDWriteDat2(*(pic+(j-x0)+(i-page0)*w));
				
		}	

	}
	

}
void delay(unsigned long time)
{	
	unsigned long i; 
	for(i=0;i<time;i++);


}
/////////////////////////////////////////////////////////////////////
void InitCom()
{
	TMOD=0x20;		//定时器设为方式2
	TL1=0xf4;		//设置定时器溢出周期：22.1184M---9600b/s
	TH1=0xf4;
	PCON=0x80;		
	TR1=1;
	SCON=0x50;
	IE=0;
	TI=1;
}

char code s0[15]="Hello World";
void cominterrupt(void )interrupt 4 using 3
{
	char i,temp;

	if(TI==1)
	{TI=0;
	   
	return;
	}
	else if(RI==1)
	{	
		RI=0;
		temp=SBUF;
		SBUF=temp-1;
		return;
	}
}
void main()
{	
	unsigned char ch1[10];
	int x,y;	
	unsigned char dat;
	InitCom();	
//	LCDInit();	
//	LCDClear();
	EA=1;
	ES=1;
	while(1){	

	printf("hfgh");
		
	}
}