原创 LCD1602滚动显示

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//LCD1602头文件

/*--------------------------------------------------------------*/
//File: LCD1602_8A.H
//Date: 08-8-9 //08-8-8 //08-8-27  //08-8-26
//Time: 20:10
//Modi: 08-8-10 9:51
//Note: LCD1602 The Best Driver for you!
//  Welcome to use. Have a good day!

/*--------------------------------------------------------------*/
//防止被重复定义
#ifndef __LCD1602_8A_H__   
#define __LCD1602_8A_H__
//所需头文件
#include <intrins.h>

/*--------------------------------------------------------------*/
//LCD1602与单片机接口定义
sfr  LCD_IO = 0xA0;   //P0-0x80,P1-0x90,P2-0xA0,P3-0xB0;
sbit LCD_RS = P3^2;   //LCD数据/命令选择端(H/L)
sbit LCD_RW = P3^3;   //LCD  读/写  选择端(H/L)
sbit LCD_EN = P3^4;   //LCD使能控制端
sbit LCD_BZ = LCD_IO^7;  //LCD忙标志位

/*--------------------------------------------------------------*/
//函数声明
void LCD_busy  (void);             //检测LCD是否忙
void LCD_init  (void);             //LCD初始化
void LCD_clr   (void);             //LCD清屏
void LCD_cmd   (unsigned char cmd);          //写入指令
void LCD_dat   (unsigned char dat);          //写入数据
void LCD_pos   (unsigned char x, unsigned char y);      //显示定位
void LCD_printc(unsigned char x, unsigned char y, unsigned char c);  //定位输出字符
void LCD_prints(unsigned char x, unsigned char y, unsigned char *s); //定位输出字符串

/*--------------------------------------------------------------*/
//检测LCD忙状态
void LCD_busy(void)
{
 do
 {
  LCD_EN = 0;
  LCD_RS = 0;   //指令
  LCD_RW = 1;   //读出
  LCD_IO = 0xff;  
  LCD_EN = 1;
  _nop_();   //高电平读出 延迟时间1us
 }while(LCD_BZ);   //LCD_BZ=1表示忙,LCD_BZ=0表示空闲
 LCD_EN = 0;
}

/*--------------------------------------------------------------*/
//写入指令
void LCD_cmd(unsigned char cmd)   
{
 LCD_busy();    //检测忙
 LCD_RS = 0;    //指令
 LCD_RW = 0;    //写入
 LCD_EN = 1;
 LCD_IO = cmd;   //传指令
 LCD_EN = 0;    //下降沿有效
}

/*--------------------------------------------------------------*/
//写入数据
void LCD_dat(unsigned char dat) 
{
 LCD_busy();    //检测忙
 LCD_RS = 1;    //数据
 LCD_RW = 0;    //写入
 LCD_EN = 1;
 LCD_IO = dat;   //传数据
 LCD_EN = 0;    //下降沿有效
}

/*--------------------------------------------------------------*/
//显示定位
void LCD_pos(unsigned char x, unsigned char y)
{
 if(y) LCD_cmd(x|0xc0);//y=1第二行显示,y=0第一行显示 0<=x<16
 else LCD_cmd(x|0x80);//数据指针=80+地址码(00H~27H,40H~67H)
}

/*--------------------------------------------------------------*/
//LCD清屏
void LCD_clr(void)
{
 LCD_cmd(0x01);
}

/*--------------------------------------------------------------*/
//定位输出字符
void LCD_printc(unsigned char x, unsigned char y, unsigned char c)
{
 LCD_pos(x,y);
 LCD_dat(c);
}

/*--------------------------------------------------------------*/
//定位输出字符串
void LCD_prints(unsigned char x, unsigned char y, unsigned char *s)
{
 LCD_pos(x,y);
 while(*s)
 {
  LCD_dat(*s);
  s++;
 }
}

/*--------------------------------------------------------------*/
//LCD初始化
void LCD_init(void)
{
 LCD_cmd(0x38);   //设置LCD为16X2显示,5X7点阵,八位数据接口 
 LCD_cmd(0x06);   //LCD显示光标移动设置(光标地址指针加1,整屏显示不移动)
 LCD_cmd(0x0c);   //LCD开显示及光标设置(光标不闪烁,不显示"_")
 LCD_cmd(0x01);   //清屏
}

/*--------------------------------------------------------------*/
#endif

//主函数

#include <AT89X52.H>
#include "LCD1602_8A.H"

//延时500ms 函数定义
void delay500ms(void)
{
    unsigned char i,j,k;
    for(i=15;i>0;i--)
    for(j=66;j>0;j--)
    for(k=251;k>0;k--);
}

void main(void)
{
 unsigned char code tab[]={"       Hello! Welcome you to our shcool! Have a good time!"};
 unsigned char *s=tab;
 LCD_init();
 while(1)
 {
  LCD_clr();
  LCD_prints(5,0,"!*^ ^*!");
  LCD_printc(8,0,'_');
  LCD_prints(0,1,s++);
  if(*s=='\0')  s="tab";
  delay500ms();
 } 
}