s12864.c.bak

单片机与4*4按键接口程序

/************************************************************************************/
/*     程序名：LCM12864（ST7920)驱动程序                                                 */
/*                                                                                  */
/*     晶振：12.0 M                                        CPU型号：AT89S52         */
/*                                                                                  */
/*                                                                                  */
/*     http://www.mculover.net                                                      */
/*     http://www.mculover.net/bbs                                                  */
/*   													 					    	*/
/*                                                                                  */
/*                                                湘灵电子工作室 版权所有           */     
/*                                                         2006-08-10               */
/************************************************************************************/ 

#include <REG51.H>


//引脚定义
sbit   CS    =  P2 ^ 0;	//片选 高电平有效 单片LCD使用时可固定高电平
sbit   SID   =  P2 ^ 1;	//数据
sbit   SCLK  =  P2 ^ 2;	//时钟
sbit   PSB   =  P2 ^ 3; //低电平时表示用串口驱动，可固定低电平
sbit   RST   =  P2 ^ 5; //LCD复位，LCD模块自带复位电路。可不接


unsigned char *line1;
unsigned char *line2;
unsigned char *line3;
unsigned char *line4;

void Write_char(bit start, unsigned char ddata);
void Send_byte(unsigned char bbyte);
void Delaynms(unsigned int di);
void Lcd_init(void);
void Disp_img(unsigned char *img);
//void Lcd_img_Cls(void);
void LCD_Write_char_string(unsigned char X,unsigned char Y,unsigned char *s);
void LCD_set_xy( unsigned char x, unsigned char y );

unsigned char code  ma[] ={"湖南科技大学    "};
unsigned char code  ma2[]={"湘灵电子工作室  "};

unsigned char code  ma3[]={"控制IC：ST7920  "};
unsigned char code  ma4[]={"  欢迎光临      "};
unsigned char code logo[]={                             
/*--  调入了一幅图像：F:\我的文档\My Pictures\`1.bmp  --*/
/*--  宽度x高度=128x64  --*/
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};

/******************************************************************************/
void Lcd_init(void)	//初始化LCD 
{
	Delaynms(10); //启动等待，等LCM讲入工作状态
//  PSB=0; ;   	 //串口驱动模式
	PSB=1;
	RST=0; Delaynms(1); RST=1; // 复位LCD

  	CS=1;
  	Write_char(0,0x30);  //8 位介面，基本指令集
  	Write_char(0,0x0c);  //显示打开，光标关，反白关
  	Write_char(0,0x01);  //清屏，将DDRAM的地址计数器归零  
}

/******************************************************************************/
void Write_char(bit start, unsigned char ddata) //写指令或数据
{
	unsigned char start_data,Hdata,Ldata;
  	if(start==0) 
		start_data=0xf8;	 //写指令
    else    
    	start_data=0xfa;  //写数据
  
  	Hdata=ddata&0xf0;		  //取高四位
  	Ldata=(ddata<<4)&0xf0;  //取低四位
  	Send_byte(start_data);	  //发送起始信号
  	Delaynms(5); //延时是必须的
  	Send_byte(Hdata);	      //发送高四位
  	Delaynms(1);  //延时是必须的
  	Send_byte(Ldata);		  //发送低四位
  	Delaynms(1);  //延时是必须的
}

/******************************************************************************/
void Send_byte(unsigned char bbyte) //发送一个字节
{
	unsigned char i;
 	for(i=0;i<8;i++)
   	{
   		SID=bbyte&0x80; //取出最高位
 		SCLK=1;
   		SCLK=0;
   		bbyte<<=1; //左移
   	}  
}

/******************************************************************************/
void Delaynms(unsigned int di) //延时
{
	unsigned int da,db;
 	for(da=0;da<di;da++)
   		for(db=0;db<10;db++);
}

/******************************************************************************/
void Disp_img(unsigned char  *img)	//图形显示     字模221 横向取膜
{ 
	unsigned char i,j;
	unsigned int k =0 ;
	for(i=0;i<32;i++)
  	{ 
		Write_char(0,0x80+i);
		Write_char(0,0x80);
    	for(j=0;j<16;j++) 
		{
			Write_char(1,img[k++]);
		}
  	}

 	for(i=0;i<32;i++)
  	{ 
		Write_char(0,0x80+i);
		Write_char(0,0x88);
    	for(j=0;j<16;j++) 
		{
			Write_char(1,img[k++]);
  		}
	}
}

/*****************************************************************************
void Lcd_img_Cls(void)  //图形方式下清屏
{ 
	unsigned char i,j;
	for(i=0;i<32;i++)
  	{ 
		Write_char(0,0x80+i);
		Write_char(0,0x80);
    	for(j=0;j<16;j++) 
			Write_char(1,0x00);///for test
  	}

 	for(i=0;i<32;i++)//
  	{
    	Write_char(0,0x80+i);
		Write_char(0,0x88);
   		for(j=0;j<16;j++) 
			Write_char(1,0x00);
  	}
}

/*-----------------------------------------------------------------------
LCD_set_xy        : 设置LCD显示的起始位置，X为行，Y为列

输入参数：x、y    : 显示字符串的位置，X:0-15，Y:0-1
                    LCD第一行显示寄存器地址：0X80-0X8F
                    LCD第一行显示寄存器地址：0XC0-0XCF

编写日期          ：2005
最后修改日期      ：2005	
-----------------------------------------------------------------------*/
void LCD_set_xy( unsigned char x, unsigned char y )
{
    unsigned char address;
	switch(x)
	{
		case 0: address = 0x80 + y; break;    
    	case 1: address = 0x80 + y; break; 
		case 2: address = 0x90 + y; break; 
   	 	case 3: address = 0x88 + y; break;
		case 4: address = 0x98 + y; break; 
		default:address = 0x80 + y; break;
	}
    Write_char(0, address);
}

/*-----------------------------------------------------------------------
LCD_Write_char_string  : 中英文字符串显示函数

输入参数：*s      ：英文字符串指针；
          X、Y    : 显示字符串的位置 

编写日期          ：2005
最后修改日期      ：2005	
-----------------------------------------------------------------------*/
void LCD_Write_char_string(unsigned char X,unsigned char Y, unsigned char *s)
{
	LCD_set_xy( X, Y );
    
    while (*s) 
    {
		Write_char( 1, *s );
	    s++;
		Delaynms(1);
	}
}
  
/********************************************************************/
void Disp(void)
{
	LCD_set_xy( 1, 0 );
	while(*line1 != 0x00)
    {
		Write_char( 1, *line1 );
	    line1++;
		Delaynms(1);
	}

	LCD_set_xy( 2, 0 );
	while(*line2 != 0x00)
    {
		Write_char( 1, *line2 );
	    line2++;
		Delaynms(1);
	}

	LCD_set_xy( 3, 0 );
	while(*line3 != 0x00)
    {	
		Write_char( 1, *line3 );
	    line3++;
		Delaynms(1);
	}

	LCD_set_xy( 4, 0 );
	while(*line4 != 0x00)
    {
		Write_char( 1, *line4 );
	    line4++;
		Delaynms(1);
	}

 	line1="";
	line2="";
	line3="";
 	line4="";
}

/******************************************************************************/
void main(void)
{
	unsigned char i;

	line1 = "湖南科技大学";
	line2 = "我们有个家";
	line3 = "大家好";
	line4 = "我们的田地";

 	Lcd_init();//初始化LCD

	Disp();// point for test
	Delaynms(4000);


    Write_char(0,0x80); for(i=0;i<16;i++)  Write_char(1,ma[i]);//16 = 8个汉字
	Delaynms(1000);

//	Write_char(0,0x08);//SLEEP
	LCD_Write_char_string(2,0,ma);//在第2行第0列开始显示
	Delaynms(10000);

//	Write_char(0,0x0C);//WAKE;

	Write_char(0,0x01);//清屏
	Write_char(0,0x36); //图形方式
	//Lcd_img_Cls();
	
	Disp_img(logo);//显示12864图片
	Delaynms(1000);
	Lcd_init();//初始化LCD，从图形显示状态下返回
	LCD_Write_char_string(4,0,ma2);
	while(1);
}