1.当按下按钮时，LCD显示为"time=0",再按一下时"time=1",依次递加到"time=24"当按24次时
 2.当确认某个时间时，按住按钮保持2秒以上，便可确认设置成功
 3.LCD是8x2的，第一排可以显示"Set Time",第二排显示时间"time=0"
 4.用的是单片机8051f226


 //#include <reg52.h>
#include <c8051f200.h>   
#define uchar unsigned char
#define uint unsigned int

#define LCD_DATA P3               //data port for LCD interface


sbit LCD_RS=P2^6;                 //LCD control pins
sbit LCD_RW=P0^5;
sbit LCD_EN=P2^0;
sbit key = P1^1;
sbit LCD=P1^7;


void delay(uint);
void lcd_com(uchar com);          //LCD command code
void lcd_data(uchar da);
void PORT_Init (void);                                //ASCII character to be display on LCD
void init();


void lcd_msg1(char*msg)
{
   char*pstr;
   pstr=msg;
   while(*pstr)
   {
      lcd_data(*pstr++);
    }
}


void delay(uint z)               //delay for z ms
{
    uint x,y;
   
    for(x=z;x>0;x--)
    for(y=100;y>0;y--);
}

void lcd_com(uchar com)          //8 bits interface,to LCD command
{
    LCD_DATA=com;
    LCD_RW=0;
    LCD_RS=0;
    LCD_EN=1;
    delay(5);
    LCD_EN=0;

}

void lcd_data(uchar da)            //send a byte to LCD data port
{
    LCD_DATA=da;
    LCD_RW=0;                  //data byte sent to the data bus
    LCD_RS=1;
    LCD_EN=1;
    delay(5);
    LCD_EN=0;
   
}

void init()
{
   

    lcd_com(0x38);            //LCD initialized 8-bit interface
    lcd_com(0x0c);         //display on, cursor off
    lcd_com(0x06);          //cursor moving direction
    lcd_com(0x01);         //clear display            
    lcd_com(0x02);            //cursor home         
}

void main()
{
    LCD_RW=0;
    LCD_EN=0;

    init();

     while(1)
        {
        if(key==0)
        {
   
           LCD=1;
           lcd_com(0x80);                                                
           lcd_msg1("Set Time");
           delay(10);
           lcd_com(0xc0);
           lcd_msg1("Time=1");
           delay(10);
         }
         if(key==1)
         {
           LCD=0;
          }
}}
void PORT_Init (void)
{
   PRT1CF |= 0x82;
  
}