lcd.h

At89s52单片机与max527的da程序

#include "main.h"

#define LCD_Data P0
sbit	LCD_RS		=P1^3;
sbit	LCD_WR		=P1^4;
sbit	LCD_E		=P1^5;
sbit    PSB         =P1^6;
/*
返回值Status:	当前地址计数器的值.
*/

unsigned char LCDBusyWait()							//等待LCD就绪
{
	unsigned char Status;
	LCD_RS=0;
	LCD_WR=1;
	LCD_Data=0xFF;
	LCD_E=1;
	Status=LCD_Data;
	LCD_E=0;
	while(Status & 0x80)
	{
   		LCD_E=1;
		Status=LCD_Data;
		LCD_E=0;
	}
	LCD_WR=0;
	return Status;
}

void WriteLCD_Data(unsigned char Data)			//向LCD写入一个字节的数据
{
	LCDBusyWait();
	LCD_RS=1;
	LCD_Data = Data;
	LCD_E=1;
	LCD_E=0;
}

void WriteLCD_Command(unsigned char Command)	//向LCD写入一个字节的命令
{
	LCDBusyWait();
	LCD_RS=0;
	LCD_Data=Command;
	LCD_E=1;
	LCD_E=0;
}

/**********************************改变地址,实现了逐行显示**************************/
unsigned char ChangeAddress(unsigned char StartAddress)
{
	switch(StartAddress)
	{
		case 0x87:WriteLCD_Command(0x90);StartAddress=0x90;break;
		case 0x8F:WriteLCD_Command(0x98);StartAddress=0x98;break;
		case 0x97:WriteLCD_Command(0x88);StartAddress=0x88;break;
		default:StartAddress+=1;
	}
	return StartAddress;
}

/*
WriteLCD 从LCD输出一个字符串：
	StartAddress为起始地址；
	Size为字符串大小；
	Size==0 时由程序自己判断字符串结束标志，否则输出 Size 个字符，不够则填充空格；
	Charactors为要求输出的字符串；
*/
void WriteLCD(unsigned char StartAddress,unsigned char Size,unsigned char Charactors[])
{
	unsigned char *i=Charactors;	  //字符串的首地址
	WriteLCD_Command(StartAddress);
	if(Size) 		//Size不为0
	{
		bit Over=0;
		while(i<(Charactors+Size))		//判断字符串结尾
		{
			if(Over)
			{
				WriteLCD_Data(' ');i++;
				if(i>=(Charactors+Size)) break;
				WriteLCD_Data(' ');i++;
			}
			else
			{

				switch(((*i)*256)+(*(i+1)))
				{

				}
			}
			StartAddress=ChangeAddress(StartAddress); //改变地址,实现了逐行显示
		}
	}
	else			                                //Size为0
	{
		while(*i)						          //判断字符串结尾,*i为0代表结束
		{
			WriteLCD_Data(*i);
			i++;
			WriteLCD_Data(*i);
			i++;
			StartAddress=ChangeAddress(StartAddress);
		}
	}
}



/*********************************功能:写入数字Number, Number为0-99的两位数字***********************/
void WriteLCD_Number(unsigned char Address,unsigned char Number)
{
	if(Address) WriteLCD_Command(Address); //如果地址为0则自动接着原来的位置写.	否则按指定地址写
	if((Number/10)!=0)
	WriteLCD_Data((Number/10)+0x30);	   //取商,取出十位数字
	WriteLCD_Data((Number%10)+0x30);	   //取余,取出个位数字
}


/**********************************功能:显示ASSIC码************************************/
void WriteLCD_CharNumber(unsigned char Address,unsigned char CharNumber)
{	 
    if(Address) 
	WriteLCD_Command(Address);       //如果地址为0则自动接着原来的位置写.	否则按指定地址写
 	WriteLCD_Data(CharNumber);
}


/*******************************功能：显示多位数据*****************************/
void WriteLCD_HalfCharNumber(unsigned char Address,unsigned long HalfCharNumber)
   { 
     static unsigned char Buffer[8];
     unsigned char j;
     unsigned char i=0;
     if(Address) 
     WriteLCD_Command(Address);
     do
     {
       Buffer[i++]=HalfCharNumber%10;         //对每一位进行存储
       HalfCharNumber=HalfCharNumber/10;
     }while(HalfCharNumber!=0);
     for(j=i;j>0;j--)
       WriteLCD_Number(0x00,Buffer[j-1]);
    }



/*********************************功能:小数显示.精确到小数点后面四位*************************/
void  WriteLCD_FloatNumber(unsigned char Address,unsigned int Float_Number)
  {
     static unsigned char Buffer[6];
     unsigned char i=0;
	 if(Address) 
	 WriteLCD_Command(Address);
	 do
	 {
	   Buffer[i++]=Float_Number%10;		  //对每一位进行逆序存储
	   Float_Number=Float_Number/10;
	 }while(Float_Number!=0);
	  
	   if(5==i)
	    { 	
		  WriteLCD_Number(0x00,Buffer[i-1]);   //显示整数		
		  WriteLCD_CharNumber(0x00,0x2E);	   //小数点显示
		  for(i=i-1;i>0;i--)
		    { 
			    WriteLCD_Number(0x00,Buffer[i-1]);   //显示整数		   
			}
		 }
	   else 
		  {
		  WriteLCD_CharNumber(0x00,0x30);          //显示零
		  WriteLCD_CharNumber(0x00,0x2E);		   //小数点显示
		   for(i=i;i>0;i--)
		  WriteLCD_Number(0x00,Buffer[i-1]);	  //显示整数
		  }
   }