#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
#define LCD_DATA P0   //定义数据线D0-D7
sbit LCD_RS=P1^0;    //定义寄存器选择位
sbit LCD_RW=P1^1;   //定义读写信号线位
sbit LCD_E=P1^2;   //定义使能信号位
sbit LCD_BUSY=LCD_DATA^7; //检测LCD状态字中BUSY标识
sbit hang1=P2^5;        //键控第一行显示
sbit hang2=P2^6;        //键控第二行显示
sbit both=P2^7;     //键控两行显示

void LCD_Init(void);
void LCD_Write_Data(uchar dat);
void LCD_Write_Cmd(uchar cmd,BusyC);
uchar LCD_Read_Data(void);
void LCD_Disp_Char(uchar X,uchar Y,uchar DData);
void LCD_Disp_String(uchar X,uchar Y,uchar code *DData);
void LCD_Delay(uint ms);
uchar LCD_Check_Busy(void);

uchar code school_name[]={"wodedianzimeng"};
uchar code email[]={"39543855@163.com"};

void main(void)
{
while(1)          
{
   if(hang1==0)        //按键1按下控制第一行显示      
    LCD_Delay(5) ;     //延时去抖动
   if(hang1==0)      //再次确认键1按下
   {
      while(hang1==0);     //等待键起 显示
   LCD_Init();
   LCD_Disp_String(0,0,school_name);
}

if(hang2==0)     //按键2控制第二行显示
    LCD_Delay(5);
if(hang2==0)
     {
   while(hang2==0);
   LCD_Init();
   LCD_Disp_String(0,1,email);
}

if(both==0)      //按键3控制两行都显示
      LCD_Delay(1);
if(both==0)
     {
    while(both==0);
   LCD_Delay(400) ;
   LCD_Init();
   LCD_Disp_String(0,0,school_name);
    LCD_Disp_String(0,1,email);
}  
}

}

void LCD_Init(void)     
{
LCD_DATA=0;     
LCD_Write_Cmd(0x38,0);    //三次显示模式设置，不检测忙信号
LCD_Delay(5);
LCD_Write_Cmd(0x38,0);
LCD_Delay(5);
LCD_Write_Cmd(0x38,0);
LCD_Delay(5);

LCD_Write_Cmd(0x38,1);   //显示模式设置，开始要求检测忙信号：8位、2行、5X7点阵
LCD_Write_Cmd(0x08,1);   //关闭显示
LCD_Write_Cmd(0x01,1);   //清屏
LCD_Write_Cmd(0x06,1);   //显示光标移动设置：文字不动，光标自动右移
LCD_Write_Cmd(0x0C,1);   //显示开及光标设置：光标关、光标不闪烁
}

void LCD_Write_Data(uchar dat)
{
LCD_Check_Busy();
LCD_DATA=dat;
LCD_RS=1;
LCD_RW=0;
LCD_E=0;
LCD_Delay(5);
LCD_E=1;
}

void LCD_Write_Cmd(uchar cmd,BusyC)
{
if(BusyC) LCD_Check_Busy();
LCD_DATA=cmd;
LCD_RS=0;
LCD_RW=0;
LCD_E=0;
LCD_Delay(5);
LCD_E=1;
}

uchar LCD_Read_Data(void)
{
LCD_RS=1;
LCD_RW=1;
LCD_E=0;
LCD_Delay(5);
LCD_E=1;
return(LCD_DATA);
}

uchar LCD_Check_Busy(void)
{
LCD_DATA=0xFF;
LCD_RS=0;
LCD_RW=1;
LCD_E=0;
LCD_Delay(5);
LCD_E=1;
while(LCD_DATA & 0x80);
return(LCD_DATA);
}

void LCD_Disp_Char(uchar X,uchar Y,uchar DData)
{
Y &=0x01;
X &=0x0F;
if(Y) X|=0x40;
X|=0x80;
LCD_Write_Cmd(X,0);
LCD_Write_Data(DData);
}

void LCD_Disp_String(uchar X,uchar Y,uchar code *DData)
{
uchar StringLength;
StringLength=0;
Y &=0x01;
X &=0x0F;
while(DData[StringLength]>0x20)
{
   if(X<=0x0F)
{
    LCD_Disp_Char(X,Y,DData[StringLength]);
        StringLength++;
   X++;
     }
}
}

void LCD_Delay(uint ms)
{
uchar i;
while(ms--)
{
    for(i=0;i<250;i++);
   }
}