lcd12864.h

这个是一个用Keil C51编写的LCD12864的驱动程序示例

/*********************************************************************/
/*********            LCD12864ptg.H C51 driver           *************/
/**********  Written by WangBiao---20060602-20070207  ****************/
/*********************************************************************/
//--------------------------------------
#define DATAPORT P0 // 数据端口!!!!!!!!!!
sbit RS = P1^2;
sbit RW = P1^3;
sbit Elcd = P1^4;
//-----------------------外部函数----------------------------------------
void Init_Lcd12864(void); //LCD RESET
void ClearAS(void);
//---------------------------------------------------------
void DispChar(unsigned char x,unsigned char y,unsigned char dataW);
void DispString(unsigned char x,unsigned char y,unsigned char *ptr);
void DispChinese(unsigned char x,unsigned char y,unsigned char *ptr);
void DispNumb(unsigned char x,unsigned char y,unsigned int n,unsigned char number_bit);
//-----------------------------------------------------------------------
//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
//-----------------------------------------------------------------------
//-----------------------内部函数----------------------------------------
void WaitForEnable(void); //忙信号检测
void LcdWrite_C(unsigned char CMD,unsigned char AttribC);//write Control Charactor
void LcdWrite_D(char dataW); //写一个数据
unsigned char LcdRead(void);//read a data from LCD
//-------------------------------------------------------------------------
//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
//-------------------------------------------------------------------------
#define LCD_BUSY_FLAG 0x80 //用于检查写忙信号
unsigned char code number_code_table[]="0123456789";//for dis table
//-----------------------------------------------------------------------
//----------------------具体子函数---------------------------------------
//-----------------初始化-------------------------------
void Init_Lcd12864(void)
{	
	LcdWrite_C(0x30,0); //显示模式设置（不测试忙信号）共三次
	LcdWrite_C(0x30,1);
	LcdWrite_C(0x0c,1);//0x0f->all on,show arrow;0x0c->no arrow
	ClearAS();
}
//-------------------------------------------------------------------
//-------------------------------------------------------------------
void ClearAS(void)
{
	unsigned char i,j;

	for(j=0;j<4;j++)
	{
		for(i=0;i<16;i++) DispChar(i,j,' ');	
	}
}
//-------------------------------------------------------------------                 
//----------------------------------------------------------------------------
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//----------------------------------------------------------------------------
//=======================================================//
//              按指定位置显示一个字符                   //
//=======================================================//
void DispChar(unsigned char x,unsigned char y,unsigned char dataW) 
{	
	unsigned char temp,t;
	
	LcdWrite_C(0x30,1);//command back

	temp=x&0x0f;
	t=y>>1;
	y&=0x01;
	if(temp&0x01)
	{	temp=temp>>1;
		if(y)temp|=0x10;
		temp|=0x80;
		if(t)temp|=0x08;
		LcdWrite_C(temp,1);
		LcdRead();
		LcdWrite_D(dataW);	
	}
	else
	{	temp=temp>>1;
		if(y)temp|=0x10;
		temp|=0x80;
		if(t)temp|=0x08;
		LcdWrite_C(temp,1);
		LcdWrite_D(dataW);
	}
}
//=======================================================//
//                 按指定位置显示一串字符                //
//=======================================================//
void DispString(unsigned char x,unsigned char y,unsigned char *ptr) 
{	unsigned char i,len=0;//len=0!!!!!!!!
	while (ptr[len]>31){len++;};//取得要显示的个数
	for(i=0;i<len;i++) 
	{	
		if((i!=0)&&((x+i)%16==0)) y++;
		DispChar((x+i)%16,y,*ptr++);
	}
}
//=======================================================//
//   按指定位置显示中文字符串（x必须偶对齐取值为0~7）    //
//=======================================================//
void DispChinese(unsigned char x,unsigned char y,unsigned char *ptr)
{	unsigned char i,len=0;//len=0!!!!!!!!
	while (ptr[len]>31){len++;};//取得要显示的个数
	for(i=0;i<len;i++) //DispChar(x*2+i,y,*ptr++);
	{	
		if((i!=0)&&((x+i)%16==0)) y++;
		DispChar((x*2+i)%16,y,*ptr++);
	}
}
//=======================================================//
//        按指定位置显示一个数字表(可变位BCD码)          //
//=======================================================//
//---------------------------------------------------------
void DispNumb(unsigned char x,unsigned char y,unsigned int n,unsigned char number_bit)
{	
	unsigned char digi[5];
	unsigned char i;

	digi[0]=n/10000;
	digi[1]=n/1000%10;
	digi[2]=n/100%10;
	digi[3]=n/10%10;
	digi[4]=n%10;

	for(i=0;i<number_bit;i++) DispChar(x+i,y,number_code_table[(digi[5-number_bit+i])]);
}
//--------------------------------------------------------------------------
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//--------------------------------------------------------------------------
//------------------------------------------------------//
//写控制字符子程序: E=1 RS=0 RW=0
//------------------------------------------------------//
void LcdWrite_C( unsigned char CMD,unsigned char AttribC ) 
{	
	if (AttribC) WaitForEnable(); // 检测忙信号?
	RS = 0; RW = 0;
	DATAPORT =CMD; // 送控制字子程序
	Elcd = 1;Elcd = 0; // 操作允许脉冲信号 
}
//------------------------------------------------------//
//当前位置写字符子程序: E =1 RS=1 RW=0
//------------------------------------------------------//
void LcdWrite_D( char dataW ) 
{	
	WaitForEnable(); // 检测忙信号
	RS = 1; RW = 0;
	DATAPORT = dataW;
	Elcd = 1;Elcd = 0; // 操作允许脉冲信号 
}
//------------------------------------------------------//
//读模块子程序：E=1 RS=1 RW=1
//------------------------------------------------------//
unsigned char LcdRead(void)
{	
	unsigned char dataW;

	WaitForEnable(); // 检测忙信号
	RS = 1; RW = 1;
	Elcd = 1;
	dataW=DATAPORT;
	Elcd = 0;// 操作允许脉冲信号
    return dataW;
}
//------------------------------------------------------//
//正常读写操作之前必须检测LCD控制器状态: CS=1 RS=0 RW=1
//DB7: 0 LCD控制器空闲; 1 LCD控制器忙
//------------------------------------------------------//
void WaitForEnable( void )
{	
	DATAPORT = 0xff;
	RS =0; RW = 1; Elcd = 1;
	while( DATAPORT & LCD_BUSY_FLAG );
	Elcd = 0;
} 
//-------------------------------------------------------------------
//###################################################################
//-------------------------------------------------------------------
//--------------------------------------------------------------------------
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//--------------------------------------------------------------------------
//-------------------End LCD12864.H-----------------------------------------