lcd1602.c

51edn开发板程序

/*---------------------------------------------------------------------
                         LCD1602.C文件 LCD1602的函数  
  作者：Computer-lov     创建日期:2004.11.12    最后修改日期:2004.11.12
  版本：1.0
----------------------------------------------------------------------*/
#include "at89x52.h"
#include "MyType.h"
#include "lcd1602.h"

#define LCD_EN P1_2
#define LCD_RS P1_0
#define LCD_RW P1_1
#define LCD_BUSY P0_7
#define LCD_DATA P0

#ifdef LCD

void LcdCheckBusy(void)   //检测LCD状态，看它是不是还在忙呢
{
 while(1)
  {
   LCD_EN=0;
   LCD_RS=0;
   LCD_RW=1;
   LCD_DATA=0xFF;
   LCD_EN=1;
   if(!LCD_BUSY)break;
  }
 LCD_EN=0;
}

void LcdCls(void)          //LCD清屏
{
 EA=0;
 LcdCheckBusy();
 LCD_RS=0;
 LCD_RW=0;
 LCD_EN=1;
 LCD_DATA=1;
 LCD_EN=0;
 EA=1;
}

void LcdWriteInstruction(uint8 LcdInstruction)   //写指令到LCD
{
 EA=0;
 LcdCheckBusy();
 LCD_RS=0;
 LCD_RW=0;
 LCD_EN=1;
 LCD_DATA=LcdInstruction;
 LCD_EN=0;
 EA=1;
}

void LcdWriteData(uint8 LcdData)      //输出一个字节数据到LCD
{
 EA=0;
 LcdCheckBusy();
 LCD_RS=1;
 LCD_RW=0;
 LCD_EN=1;
 LCD_DATA=LcdData;
 LCD_EN=0;
 EA=1;
}
 
void LcdSetPosition(uint8 x)            //LCD光标定位到x处
{
 LcdWriteInstruction(0x80+x);
}

/*void LcdGoHome(void)                         //LCD光标归位
{
 LcdWriteInstruction(LCD_GO_HOME);
}*/
/*
void LcdPrintc(uint8 LcdData)          //输出一个字符到LCD
{
 LcdWriteData(LcdData);
}*/

void LcdPrints(uint8 *LcdString)       //输出一个字符串到LCD
{
 uint8 i=0;
 while(LcdString[i]!=0x00)
  {
   LcdWriteData(LcdString[i]);
   i++;
  } 
}

void LcdInit(void)                        //初始化LCD
{
 LcdWriteInstruction(LCD_AC_AUTO_INCREMENT|LCD_MOVE_DISENABLE);
 LcdWriteInstruction(LCD_DISPLAY_ON|LCD_CURSOR_OFF);
 LcdWriteInstruction(LCD_DISPLAY_DOUBLE_LINE);
 LcdSetPosition(0);
 LcdCls();
}

#endif