想请教一下各位大佬，为什么LCD1602显示屏上一直显示0？ -

/************************************
*********STC89C52**********
**********12MHz晶振*********/
#include "reg51.h"
#include<stdio.h>
#include<intrins.h>
#define uint8 unsigned char
#define uint16 unsigned int
#define uchar unsigned char
#define uint unsigned int
uint16 cnt2ms; //10ms计时器
uint8 cnt1s; //1秒计数器
//电阻--------------------------------
#define Z1 13700053.00
#define Z2 3685279.00
float RZ=0;
unsigned long RX=0;
unsigned long RX2=0;
unsigned long RX3=0;
unsigned long RX4=0;
unsigned long RX5=0;
unsigned long RX6=0;
unsigned long RX7=0;
unsigned long RX8=0;
unsigned long RX9=0;
//电感--------------------------------
float LZ=0;
#define C1 0.1461
//电容--------------------------------
float CZ=0;
float CX=0;
#define R1 42874
uint8 KL=0; //
unsigned int Pulsecnt=0; //脉冲个数
unsigned int Pulsenum; //脉冲个数
uint8 start=0; //
uint16 PulseTime; //10ms计数器
uint16 Pulse; //10ms计数器
bit flag=0;
uint8 CH=0; //
unsigned long x;
void Init_Extint(void);
void TimerInitProc();
void Init_System(void);
void Display(uint8 chose_dat, uint8 dat);
void ShowDisp(uint8 tPulsenum, uint8 tPulsecnt, uint8 tcnt1s);
void DelayMs(uint8 Ms);
uint8 Pulse_FLAG=0;
uint8 Pulse_5=0;
/********************************按键*****************************************/
sbit K1=P1^3;
sbit K2=P1^4;
sbit K3=P1^5;
sbit A0=P2^1;
sbit A1=P2^0;
sbit RED=P3^6;
sbit YEW=P3^4;
sbit GRE=P3^3;
/********************************LCD液晶**************************************/
#define LCD_Data P0 //LCD的数据口
sbit LCD_BF=LCD_Data^7; //LCD的忙信号位
sbit LCD_RS=P1^0;
sbit LCD_RW=P1^1;
sbit LCD_EN=P1^2;
#define LCD_GO_HOME 0x02 //AC=0，光标、画面回HOME位
//输入方式设置
#define LCD_AC_AUTO_INCREMENT 0x06 //数据读、写操作后，AC自动增一
#define LCD_AC_AUTO_DECREASE 0x04 //数据读、写操作后，AC自动减一
#define LCD_MOVE_ENABLE 0x05 //数据读、写操作，画面平移
#define LCD_MOVE_DISENABLE 0x04 //数据读、写操作，画面不动
//设置显示、光标及闪烁开、关
#define LCD_DISPLAY_ON 0x0C //显示开
#define LCD_DISPLAY_OFF 0x08 //显示关
#define LCD_CURSOR_ON 0x0A //光标显示
#define LCD_CURSOR_OFF 0x08 //光标不显示
#define LCD_CURSOR_BLINK_ON 0x09 //光标闪烁
#define LCD_CURSOR_BLINK_OFF 0x08 //光标不闪烁
//光标、画面移动，不影响DDRAM
#define LCD_LEFT_MOVE 0x18 //LCD显示左移一位
#define LCD_RIGHT_MOVE 0x1C //LCD显示右移一位
#define LCD_CURSOR_LEFT_MOVE 0x10 //光标左移一位
#define LCD_CURSOR_RIGHT_MOVE 0x14 //光标右移一位
//工作方式设置
#define LCD_DISPLAY_DOUBLE_LINE 0x38 //两行显示
#define LCD_DISPLAY_SINGLE_LINE 0x30 //单行显示
/*定义子程序*/
void LCD_ClrAll(void); //清屏
void Judge_LCD_busy(void); //检测是否忙碌
void LCD_Write(uchar WriteData); //写控制字
void LCD_write_data(uchar LCD_data); //写数据显示
void LCD_cursor(uchar x); //光标起始地址
void LCD_printc(unsigned char lcd_data) ; //输出一个字符
void LCD_prints(unsigned char *lcd_string);//输出一个字符串
/*LCD1602忙碌判断子程序*/
void Judge_LCD_busy(void) //判断LCD1602是否忙状态
{
while(1)
{
LCD_EN=0;
LCD_RS=0;
LCD_RW=1;
LCD_Data=0xff;
LCD_EN=1; //EN 是1-0 使能
if(!LCD_BF)break; //LCD_BF=1表示忙碌，需要等待
}
LCD_EN=0;
}
/******LCD清屏***************/
void LCD_ClrAll(void)
{
Judge_LCD_busy(); //判断是否忙碌
LCD_RS=0;
LCD_RW=0;
LCD_Data=0x01;
LCD_EN=1;
LCD_EN=0;
}
/*******LCD写数据定义各种模式*********/
void LCD_Write(uchar WriteData) //写指令到LCD
{
Judge_LCD_busy();
LCD_RS=0;
LCD_RW=0;
P0=WriteData; //把WriteDate的数据送到数据口
LCD_EN=1;
LCD_EN=0;
}
/********LCD显示数据***********/
void LCD_write_data(uchar LCD_data) //输入一个字节数据到LCD
{
Judge_LCD_busy();
LCD_RS=1;
LCD_RW=0;
P0=LCD_data;
LCD_EN=1;
LCD_EN=0;
}
/****光标位置的确定***/
void LCD_cursor(uchar x) //LCD光标定位到x处
{
LCD_Write(0x80+x); //第一行地址是0x80
}
/*输入一个字符*/
void LCD_printc(unsigned char lcd_data)
{
LCD_write_data(lcd_data);
}
/*输出字符串*/
void LCD_prints(unsigned char *lcd_string)
{
unsigned char i=0;
while(lcd_string[i]!=0x00)
{
LCD_write_data(lcd_string[i]);
i++;
}
}
/*初始化程序*/
void LCD_initial(void) //初始化LCD
{
LCD_Write(LCD_AC_AUTO_INCREMENT|LCD_MOVE_DISENABLE);
LCD_Write(LCD_DISPLAY_ON|LCD_CURSOR_OFF);
LCD_Write(LCD_DISPLAY_DOUBLE_LINE);
LCD_ClrAll();
}
/****延时******/
void delay_1ms(uint x)
{
uint j;
uchar i;
for(j=0;j<x;j++)
{
for(i=0;i<120;i++);
}
}
void Key_SM(void){
if(K3==0){
delay_1ms(5);
if(K3==0){
YEW=1;RED=0;
GRE=1;
LCD_cursor(0x00);
LCD_prints(" MEASURE Lx ");
//----电感档-------
A0=0;
A1=1;
CH=2;//电感档
while(K3==0){}
}
}
if(K2==0){
delay_1ms(5);
if(K2==0){
GRE=1;YEW=0;
RED=1;
LCD_cursor(0x00);
LCD_prints(" MEASURE Rx ");
//----电阻档-------
A0=1;
A1=0;
CH=1;//电阻档
while(K2==0){}
}
}
if(K1==0){
delay_1ms(5);
if(K1==0){
YEW=1;GRE=0;RED=1;
LCD_cursor(0x00);
LCD_prints(" MEASURE Cx ");
//----电容档-------
A0=0;
A1=0;
CH=3;//电容档
while(K1==0){}
}
}
}
void Value_to_ASCII(unsigned long value,uchar add)
{
unsigned char temp[] = "0000.000K ";
temp[0] = value/1000000 + 0x30;//数值改成字符，液晶显示需要ASCII码
value = value%1000000;
temp[1] = value/100000 + 0x30;
value = value%100000;
temp[2] = value/10000 + 0x30;
value = value%10000;
temp[3] = value/1000 + 0x30;
value = value%1000;
temp[5] = value/100 + 0x30;
value = value%100;
temp[6] = value/10 + 0x30;
value = value%10;
temp[7] = value + 0x30;
LCD_cursor(add); //光标起始地址，第一行地址是0x00~0x0F,第二行地址是0x40~0x4f
LCD_prints(temp);
}
void Value_to_ASCIIL(unsigned long value,uchar add)
{
unsigned char temp[] = "000000uH ";
temp[0] = value/100000 + 0x30;
value = value%100000;
temp[1] = value/10000 + 0x30;
value = value%10000;
temp[2] = value/1000 + 0x30;
value = value%1000;
temp[3] = value/100 + 0x30;
value = value%100;
temp[4] = value/10 + 0x30;
value = value%10;
temp[5] = value + 0x30;
LCD_cursor(add); //光标起始地址，第一行地址是0x00~0x0F,第二行地址是0x40~0x4f
LCD_prints(temp);
}
void Value_to_ASCIIC(unsigned long value,uchar add)
{
unsigned char temp[] = "00000.0pF ";
temp[0] = value/100000 + 0x30;
value = value%100000;
temp[1] = value/10000 + 0x30;
value = value%10000;
temp[2] = value/1000 + 0x30;
value = value%1000;
temp[3] = value/100 + 0x30;
value = value%100;
temp[4] = value/10 + 0x30;
value = value%10;
temp[6] = value + 0x30;
LCD_cursor(add); //光标起始地址，第一行地址是0x00~0x0F,第二行地址是0x40~0x4f
LCD_prints(temp);
}
//--------------------主程序--------------------------------
void main()
{
TMOD=0x51; //设置定时器0，方式1：:1位定时器
TH1=0;
TL1=0;
TH0=(65536-2100)/256; //设定定时周期
TL0=(65536-2100)%256;
TR0=1;
TR1=1;
ET1=1;
ET0=1;
EA=1;
//----电阻档-------
A0=1;
A1=0;
LCD_initial();
delay_1ms(50);
LCD_initial();
delay_1ms(50);
LCD_cursor(0x00);
LCD_prints(" MEASURE Rx ");
GRE=1;
YEW=0;
RED=1;
LCD_cursor(0x45);
CH=1;
while(1)
{
Key_SM();
if(flag==1){
flag=0;
x=Pulsenum*65536+TL1;//计算1s内的脉冲个数，频率=脉冲个数
if(CH==1){
RZ=(Z1/x);//测量100到1000
RX=RZ-1000;
RX=RX>>1;
if(RX>=100){
RX=RX+100;
}else{RX=0;}
if(x==0){RX=0;RX2=0;RX3=0;RX4=0;RX5=0;RX6=0;RX7=0;RX8=0;RX9=0;}
if(RX>1000000){RX=1000000; }
RX2=(RX+RX3+RX4+RX5+RX6+RX7+RX8+RX9)>>3;//求平均提高精度
RX9=RX8;RX8=RX7;RX7=RX6;RX6=RX5;RX5=RX4;RX4=RX3;RX3=RX;
//保存上一次的阻值
Value_to_ASCII(RX2,0x44);//更新阻值显示
}
if(CH==2){
LZ=(x*39*C1)/100000;
LZ=LZ*x;
LZ=1000000/LZ;
if(x==0)LZ=0;
if(LZ>999999)LZ=999999; //限制最高值
Value_to_ASCIIL(LZ,0x44);//更新电感值显示
}
if(CH==3){
CZ=660000/x;
if(x==0||x>30500)CZ=0;
if(CZ>999999)CZ=999999; //限制最高值
Value_to_ASCIIC(CZ,0x44);//更新电容值显示
}
cnt2ms=0;
Pulsenum=0;
TH1=0;
TL1=0;
TR1=1;
}
}
}
/*******************************************************************************
* 函数名：Extio interrupt
* 函数功能：/TO引脚下降沿进入中断
* 入口参数：无
* 返回：无
*******************************************************************************/
void T1_interrupt(void) interrupt 3 using 0
{
Pulsenum++; //保存测得脉冲值
}
/********************************************************************
函数功能：定时器/计时器1中断处理
入口参数：null
返回：null
备注：null
********************************************************************/
void Timer0IntProc() interrupt 1 using 0 //2ms
{
TH0=(65536-2000)/256;
TL0=(65536-2000)%256;
cnt2ms++;
if(cnt2ms==500) //1s计时到
{
cnt2ms = 0;
flag=1;
}
}

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