2.28

#include<reg52.h>


#define LCD1602_DB P0
sbit LCD1602_RS = P2^4;
sbit LCD1602_RW = P2^5;
sbit LCD1602_E = P2^6;


void InitLcd1602();
void LcdShowStr(unsigned char x,unsigned char y,unsigned char *str,unsigned char len);


bit flag = 0;
unsigned char code str1[] = "ZHOUTAO";
unsigned char code str2[] = "Welcome";


void main()
{
unsigned char pdata bufMove1[16+sizeof(str1)+16];
unsigned char pdata bufMove2[16+sizeof(str2)+16];
    unsigned char index = 0;
unsigned char i;


EA = 1;
TMOD = 0x01;
TH0 = 0xD8;
TL0 = 0xF0;
ET0 = 1;
TR0 = 1;


InitLcd1602();


    for(i=0;i<16;i++)
{
   bufMove1[i] = ' ';
bufMove2[i] = ' ' ;
}
for(i=0;i<(sizeof(str1)-1);i++)
{
   bufMove1[16+i] = str1[i];
bufMove2[16+i] = str2[i];
}
for(i=(16+sizeof(str1)-1);i<sizeof(bufMove1);i++)
{
   bufMove1[i] = ' ';
bufMove2[i] = ' ';
}


while(1)
{
///////////////////////////////////////静态显示
   /*InitLcd1602();
   LcdShowStr(3,0,str1);
   LcdShowStr(0,1,str2);*/
///////////////////////////////////////动态显示
        /*InitLcd1602();
LcdShowStr(3,0,str1);
LcdShowStr(0,1,str2);*/
///////////////////////////////////////滚动显示 
        if(flag == 1)
{
   flag = 0;
LcdShowStr(0,0,bufMove1+index,16);
LcdShowStr(0,1,bufMove2+index,16);
index++;
if(index >= (16+sizeof(str1)-1))
{
   index = 0;
}
}
}
}


void InterruptTimer0() interrupt 1
{
     static unsigned char cnt = 0;


     TH0 = 0xD8;
TL0 = 0xF0;
cnt++;
if(cnt > 50)
{
   cnt = 0;
flag = 1;
}
}


void LcdWaitReady()
{
    unsigned char sta;


LCD1602_DB = 0xFF;
LCD1602_RS = 0;
LCD1602_RW = 1;
do{
   LCD1602_E = 1;
sta = LCD1602_DB;
LCD1602_E = 0;
}while(sta & 0x80);
}


void LcdWriteCmd(unsigned char cmd)
{
    LcdWaitReady();
LCD1602_RS = 0;
LCD1602_RW = 0;
LCD1602_DB = cmd;
LCD1602_E = 1;
LCD1602_E = 0;
}


void LcdWriteDat(unsigned char dat)
{
    LcdWaitReady();
LCD1602_RS = 1;
LCD1602_RW = 0;
LCD1602_DB = dat;
LCD1602_E = 1;
LCD1602_E = 0;
}


void LcdSetCursor(unsigned char x,unsigned char y)
{
    unsigned char addr;


if(y == 0)
{
  addr = 0x00 + x; 
}
else
{
  addr = 0x40 + x;
}
LcdWriteCmd(addr|0x80);
}


/*void delay(unsigned char cnt)
{
    unsigned char i,j;
    for(i=0;i<255;i++)
{
       for(j=0;j<cnt;j++);
    }
}*/


void LcdShowStr(unsigned char x,unsigned char y,unsigned char *str,unsigned char len)
{
    LcdSetCursor(x,y);
while(len--)
{
   LcdWriteDat(*str++);
//delay(100);
}
}


void InitLcd1602()
{
    LcdWriteCmd(0x38);
LcdWriteCmd(0x0C);
LcdWriteCmd(0x06);
LcdWriteCmd(0x01);
}