51单片机总线与非总线的程序对比

#include 
#define uchar unsigned char
#define uint unsigned int
uchar code table[]="The distance is ";
uchar code table1[]="     00.0cm     ";
sbit shuru=P1^0;
sbit yidianling=P1^0;
sbit yidianyi=P1^3;//延时
void delay(uint z)
{
    uint x,y;
    for(x=z;x>0;x--)
        for(y=110;y>0;y--);
}

//1602写地址
void write_com(uchar com)
{
    yidianling=0;
    yidianyi=0;
    P0=com;
    delay(5);
    shuru=1;
    delay(5);
    shuru=0;
} 
//1602写数据                                                                        
void write_data(uchar date)
{
    yidianling=1;
    yidianyi=0;
    P0=date;
    delay(5);
    shuru=1;
    delay(5);
    shuru=0;
}
//初始化
void init()
{
    uchar num;
    shuru=0;    
    write_com(0x38);
    write_com(0x0c);
    write_com(0x06);
    write_com(0x01);
    write_com(0x10);
    write_com(0x80);
    for(num=0;num<16;num++)
    {
        write_data(table[num]);
        delay(2);
    }
    write_com(0x80+0x40);//0x53
    for(num=0;num<16;num++)
    {
        write_data(table1[num]);
        delay(2);
    }
}
//1602选 写的位置和数据
void write_sfm(uchar add,uchar date)
{
    write_com(0x80+0x40+add);
    write_data(0x30+date);    
}
//主函数
void main()
{
    P1=0xff;
    P0=0xff;
    init();
    while(1)；
}

#include 
#include 
#define LCD_COM XBYTE[0XD]
#define LCD_Data XBYTE[0xD001]
delay()
{
 unsigned short i,j;
 for(i=0;i<=200;i++)
 {
  for(j=0;j<=200;j++);
 }
}
void main()
{ 
 LED=0X55;
 LCD_COM=0X01;
 delay();
 LED=0XAA;
 delay();
 LED=0X55;
 LCD_COM=0X01;
 delay();
 LED=0XAA;
 LCD_COM=0X38;
 delay();
 LCD_COM=0X38;
 delay();
 LCD_COM=0X38;
 delay();
 LCD_COM=0X38;
 delay();
 LCD_COM=0X08;
 delay();
 LED=0XAA;
 LCD_COM=0X01;
 delay();
 LCD_COM=0X06;
 delay();
 LCD_COM=0X0F;
 delay();
 while(1);
}

LCD_Data='a';

#define LCD_COM XBYTE[0XD]
#define LCD_Data XBYTE[0xD001]