LCD1602显示接收的串口通讯字串

#include <reg52.h>

typedef unsigned int uint;
typedef unsigned char uchar;


void delay(uint z){
	uint x,y;
	for(x=z;x>0;--x)
		for(y=110;y>0;--y);
}

uchar posit = 0x00;

sbit lcd_en_port=P3^4;
sbit lcd_rs_port=P3^5;
sbit lcd_rw_port=P3^6;
sbit dula=P2^6;//数码管的段选信号
sbit wela=P2^7; //数码管的位选信号


void lcd_busy_wait() /*LCD1602 忙等待*/
{
    lcd_rs_port = 0;
    lcd_rw_port = 1;
    lcd_en_port = 1;
    P0 = 0xff;
    while (P0&0x80);
    lcd_en_port = 0; 

}
void lcd_command_write(uchar com){
	lcd_rs_port=0;
	lcd_rw_port=0;
	lcd_en_port=0;
	P0=com;
	lcd_en_port=1;
	lcd_en_port=0;
}

void lcd_data_write(uchar _data){
	lcd_rs_port=1;
	lcd_rw_port=0;
	lcd_en_port=0;
	P0=_data;
	lcd_en_port=1;
	lcd_en_port=0;
}

void lcd_char_write(uchar _posit,uchar _data){
	uchar row,col,addr=0x00;
	row=(_posit>>4)&0x01;
	col=_posit&0x0f;
	addr=col;
	if(row){
		addr+=0x40;
	}
	addr+=0x80;
	lcd_busy_wait();
	lcd_command_write(addr);
	lcd_busy_wait();
	lcd_data_write(_data);
	P0=0xff;
}

void lcd_char_show(uchar content){
	lcd_char_write(posit++,content);
	if(posit>=0x20){
		posit=0x00;
	}
}

void lcd_system_reset() /*LCD1602 初始化*/
{
	dula=1;
	wela=1;
    delay(15);
    lcd_command_write(0x38);
    delay(5);
    lcd_command_write(0x38);
    delay(5);
    lcd_command_write(0x38);
	//have to read
	lcd_busy_wait();
    lcd_command_write(0x01);
	lcd_busy_wait();
    lcd_command_write(0x06);
	lcd_busy_wait();
    lcd_command_write(0x0c); 
	P0 = 0xff; /*释放数据端口*/
}

void ser_system_reset(){
	TMOD=0x20;
	TH1=0xfd;
	TL1=0xfd;
	TR1=1;
	REN=1;
	SM0=0;
	SM1=1;
	EA=1;
	ES=1;
}

void ser() interrupt 4{
	uchar _content;
	if(RI){
		//EA=0;
		_content=SBUF;
		lcd_char_show(_content);
		RI=0;
		SBUF=_content;
		//while(!TI);
		TI=0;
		//EA=1;
	}
}

void main(){
	uchar num;
	lcd_system_reset();
	ser_system_reset();
	while(1);
}