lcd1602.h

关于proteus的仿真实例

#ifndef _LCD1602_H__
#define _LCD1602_H__

#include "absacc.h"

//以下常数定义来自LCD数据手册  
#define LCD_LINE_1                              0x00
#define LCD_LINE_2                              0x40

#define LCD_ClEAR_SCREEN                0x01    //清屏
#define LCD_HOMING                      0x02    //光标返回原点  
#define LCD_AC_UP                           0x06        //地址计数器自动+1
#define LCD_AC_DOWN                             0x04    //地址计数器自动-1,default
#define LCD_MOVE                            0x05    //画面可平移  
#define LCD_NO_MOVE                             0x04    //画面不可平移,default

#define LCD_SHOW                            0x0c    //显示开
#define LCD_HIDE                            0x08    //显示关
#define LCD_NO_CURSOR                   0x0c    //无光标
#define LCD_CURSOR_NO_FLASH             0x0e    //显示光标不闪烁
#define LCD_CURSOR_FLASH                0x0f    //显示光标不闪烁

#define LCD_PIC_MOVE                    0x18    //画面平移一个字符  
#define LCD_CURSOR_MOVE                 0x10    //光标平移一个字符  
#define LCD_RIGHT_MOVE                  0x14    //右移
#define LCD_lEFT_MOVE                   0x10    //左移                    
#define LCD_SET_7                           0x38    //8位接口，双行显示，5＊7字符  
#define LCD_SET_10                              0x3c    //8位接口，双行显示，5＊10字符  

//以下编址由硬件决定，这里是基于51MCU&CPLD实验板
//RS=P2.0，RW=P2.1
#define LCD_CW XBYTE[0xfceb]
#define LCD_CR XBYTE[0xfeeb]
#define LCD_DW XBYTE[0xfdeb] 
#define LCD_DR XBYTE[0xffeb]

#define LCD_CGRAM_ADDR(addr) (0x40|addr)
#define LCD_DDRAM_ADDR(addr) (0x80|addr)

delay(unsigned char time)
{
        while(--time);
}

//LCD状态检测,根据最高位判断LCD是否忙
unsigned char LCD_BUSY(void)
{
        delay(20);//Protues仿真环境下必须延时
        if((bit)(LCD_CR & 0x80)) return (1);
        else  return (0);
}

//将要显示的字符写入LCD  
void Print(unsigned char *str,unsigned char n){
 unsigned char i;
 for(i=0;i<n;i++){
   while(LCD_BUSY());
   LCD_DW = *str;//直接针对外部地址些 movx指令  
   str++;
 }
}

//LCD初始化
void LCD_Init(void)
{
        while(LCD_BUSY());      LCD_CW = LCD_SET_7;             
        while(LCD_BUSY());      LCD_CW = LCD_AC_UP;     
        while(LCD_BUSY());      LCD_CW = LCD_SHOW;
}

//光标位置设定，由行列参数确定（1，16）（2，1）
void LCD_SET_CURSOR(unsigned char line,unsigned char column)
{
        while(LCD_BUSY());
        switch(line){
         case 1: LCD_CW = 0x80 + column-1;//光标定位
        break;
         case 2: LCD_CW = 0xc0 + column-1;//光标定位
                break;
         default: break;
        }
}

//显示光标设定
void LCD_CURSOR_ONOFF(unsigned char cursor_flag)
{
        while(LCD_BUSY());
        switch(cursor_flag) {
         case 1: LCD_CW = LCD_NO_CURSOR;//无光标
        break;
         case 2: LCD_CW = LCD_CURSOR_NO_FLASH;//有光标不闪烁
                break;
         case 3: LCD_CW = LCD_CURSOR_FLASH;//有光标闪烁
                break;
         default: break;
        }
}
#endif