求助各位大侠，我的程序那里有问题啊？

#include <reg51.h>
#include <intrins.h> 
#define uchar unsigned char
#define uint  unsigned int
#define LCD_data  P0             //数据口
sbit LCD_RS  =  P3^5;            //寄存器选择输入
sbit LCD_RW  =  P2^0;            //液晶读/写控制
sbit LCD_EN  =  P3^4;            //液晶使能控制
sbit LCD_PSB =  P2^1;            //串/并方式控制
sbit wela    =  P2^7;
sbit dula    =  P2^6;            //关闭LED灯
sbit wr=P3^6;
sbit rd=P3^7;
sbit fm=P2^3;
uint temp;
uchar p=3,q=1,jianzhi;
uint a1,a2,a3,date,q1;
uchar code dis1[] = {"毕业设计电子秤"};
uchar code dis2[] = {"单价:"};
uchar code dis3[] = {"重量:"};
uchar code dis4[] = {"总价:"};
uchar code table[]="0123456789";
uchar code table1[]="Kg";
uchar code table2[]={"元"};
uchar code dis5[] = {"2012毕业设计电子秤"};
uchar code dis6[] = {"姓名：钱志伟"};
uchar code dis7[] = {"学号：5901108126"};
uchar code dis8[] = {"欢迎老师批评指正"};
#define delayNOP(); {_nop_();_nop_();_nop_();_nop_();};//宏定义延时4个CPU
uchar IRDIS[2];
uchar IRCOM[4];
void delay0(uchar x);  //x*0.14MS
void beep();
void  dataconv();
void lcd_pos(uchar X,uchar Y);  //确定显示位置
     uint AD_read();
     key_read ();
void disp_ad();
void disp_dy();
void disp_kj();
void disp_jianpan(uchar jian);
void  disp_zongjia(uint qian);

void delay(int ms)
{
    while(ms--)
 {
      uchar i;
   for(i=0;i<250;i++) 
    {
     _nop_();     
  _nop_();
  _nop_();
  _nop_();
    }
 }
}  
bit lcd_busy()
 {                         
    bit result;
    LCD_RS = 0;
    LCD_RW = 1;
    LCD_EN = 1;
    delayNOP();
    result = (bit)(P0&0x80);
    LCD_EN = 0;
    return(result);
 }
/*******************************************************************/
/*                                                                 */
/*写指令数据到LCD                                                  */
/*RS=L，RW=L，E=高脉冲，D0-D7=指令码。                             */
/*                                                                 */
/*******************************************************************/
void lcd_wcmd(uchar cmd)
{                         
   while(lcd_busy());
    LCD_RS = 0;
    LCD_RW = 0;
    LCD_EN = 0;
    _nop_();
    _nop_();
    P0 = cmd;
    delayNOP();
    LCD_EN = 1;
    delayNOP();
    LCD_EN = 0; 
}
/*******************************************************************/
/*                                                                 */
/*写显示数据到LCD                                                  */
/*RS=H，RW=L，E=高脉冲，D0-D7=数据。                               */
/*                                                                 */
/*******************************************************************/
void lcd_wdat(uchar dat)
{                         
   while(lcd_busy());
    LCD_RS = 1;
    LCD_RW = 0;
    LCD_EN = 0;
    P0 = dat;
    delayNOP();
    LCD_EN = 1;
    delayNOP();
    LCD_EN = 0;
}
void lcd_init()
{

    LCD_PSB = 1;         //并口方式
   
    lcd_wcmd(0x34);      //扩充指令操作
    delay(5);
    lcd_wcmd(0x30);      //基本指令操作
    delay(5);
    lcd_wcmd(0x0F);      //显示开，开光标
    delay(5);
    lcd_wcmd(0x01);      //清除LCD的显示内容
    delay(5);
}
  main()
 {
    uchar w;
   
    uchar jiage[3];
   
    while(1)
    {
    
    delay(10);                 //延时
    wela=0;
    dula=0;
    lcd_init();                //初始化LCD            
    disp_kj();//开机界面的显示
    delay(500);
     disp_dy();//显示价格重量等固定的文字
       disp_ad();//AD转换值的显示
     while(q)//判断标志位q是否为0，为0表示键盘按了确定键
     { uchar n=2;
       w=key_read ();//调出键值
       disp_jianpan(w);//将键值显示
       jiage[n]=jianzhi;//将键值存入数组中
       p++;
       n--;
     }
     q=1;
      p=3;
     q1=jiage[2]*100+jiage[1]*10+jiage[0];//得到按键数
     disp_zongjia(q1);//总价的计算和显示
   }
}

void delay0(uchar x)    //x*0.14MS
{
  uchar i;
  while(x--)
 {
  for (i = 0; i<13; i++) {}
 }
}
void lcd_pos(uchar X,uchar Y)
{                         
   uchar  pos;
   if (X==0)
     {X=0x80;}
   else if (X==1)
     {X=0x90;}
   else if (X==2)
     {X=0x88;}
   else if (X==3)
     {X=0x98;}
   pos = X+Y ; 
   lcd_wcmd(pos);     //显示地址
}
/*AD转换函数*/
uint AD_read()
{
  wela=1;
  P0=0;
  _nop_();
  wr=0;
   _nop_();
  wr=1;
  P0=0xff;
  delay(10);
 
  P0=0;
  rd=0;
  _nop_();
  P1=0xff;
  temp=P1;
  return temp;

}