lcd1602_4.h

文件夹包含LCD1602的一些经常用到的驱动: ├─★★LCD1602四线驱动 ├─★LCD1602_8显示Mini Driver ├─★★LCD1602A_优化驱动 ├─★▲LCD1602滚

/*--------------------------------------------------------------*/
//LCD1602四线驱动程序
//File:	LCD1602_4.H
//Date:	08-8-7
//Time:	9:21
//Ver:	0.01


/*--------------------------------------------------------------*/
#ifndef __LCD1602_4_H__		//防止被重复定义
#define __LCD1602_4_H__


/*--------------------------------------------------------------*/
//LCD1602接口定义
sfr		LCD_DATA    = 0xa0;		//P2口高四位(P2^4~P2^7)与LCD的高四位(D4~D7)一一对应相接
sbit	LCD_RS		= P2^2;		//数据指令
sbit	LCD_EN		= P2^3;		//使能端
//sbit	LCD_RW		= GND;		//读写控制端接地	^_^哈哈,又少了一根线咯!


/*--------------------------------------------------------------*/
//函数声明
void LCD_init   (void);													//液晶初始化
void LCD_en     (void);													//输入使能
void LCD_clr	(void);													//液晶清屏
void LCD_cmd    (unsigned char cmd);									//指令输入
void LCD_dat    (unsigned char dat);									//数据输入
void LCD_delay  (unsigned char m, unsigned char n);						//延迟时间
void LCD_pos    (unsigned char x, unsigned char y);						//液晶定位
void LCD_printc (unsigned char x, unsigned char y, unsigned char c);	//字符定位输出
void LCD_prints (unsigned char x, unsigned char y, unsigned char *s);	//字符串定位输出
/*
void LCD_fprints(unsigned char *s,signed char pos);						//字符串输出
*/

/*--------------------------------------------------------------*/
//延迟时间12us→130 000us
void LCD_delay(unsigned char m, unsigned char n)
{
    unsigned char tempm,tempn=n;
    do{tempm=m;while(--tempm);}while(--tempn);
}


/*--------------------------------------------------------------*/
//液晶初始化
void LCD_init(void)
{
	LCD_cmd(0x28);
	LCD_en();
	LCD_cmd(0x28);			//四线显示
	LCD_cmd(0x0c);			//显示打开
	LCD_cmd(0x01);			//显示清屏
	LCD_delay(2, 249);		//2000-2 us
}


/*--------------------------------------------------------------*/
//输入使能
void LCD_en(void)
{
	LCD_EN = 1;
	LCD_delay(1,1);			//12us
	LCD_EN = 0;
}


/*--------------------------------------------------------------*/
//指令输入
void LCD_cmd(unsigned char cmd)
{
	LCD_delay(15,1);		//40us
	LCD_RS = 0;				//指令
	LCD_DATA &= 0x0f;		//清高四位
	LCD_DATA |= cmd&0xf0;	//写高四位
	LCD_en();
	cmd <<= 4;				//低四位移到高四位
	LCD_DATA &= 0x0f;		//清高四位
	LCD_DATA |= cmd&0xf0;	//写高四位
	LCD_en();
}


/*--------------------------------------------------------------*/
//数据输入
void LCD_dat(unsigned char dat)
{
	LCD_delay(15,1);		//40us
	LCD_RS = 1;				//数据
	LCD_DATA &= 0x0f;		//清高四位
	LCD_DATA |= dat&0xf0;	//写高四位
	LCD_en();
	dat <<= 4;				//低四位移到高四位
	LCD_DATA &= 0x0f;		//清高四位
	LCD_DATA |= dat&0xf0;	//写高四位
	LCD_en();
}


/*--------------------------------------------------------------*/
//液晶清屏
void LCD_clr(void)	
{
	LCD_cmd(0x01);
	LCD_delay(2, 249);		//2000-2 us
}


/*--------------------------------------------------------------*/
//液晶定位
void LCD_pos(unsigned char x, unsigned char y)
{
	if(y)	LCD_cmd(x|0xc0);
	else	LCD_cmd(x|0x80);
}



/*--------------------------------------------------------------*/
//字符定位输出
void LCD_printc(unsigned char x, unsigned char y, unsigned char c)
{
	LCD_pos(x, y);
	LCD_dat(c);
}


/*--------------------------------------------------------------*/
//字符串定位输出
void LCD_prints(unsigned char x, unsigned char y, unsigned char *s)
{
	LCD_pos(x, y);
	while(*s)
	{
		LCD_dat(*s);
		s++;
	}
}


/*--------------------------------------------------------------*/
//字符串输出		//pos=-1 清屏	*s='\n' 换行   *s='\b' 退格
/*void LCD_fprints(unsigned char *s, signed char pos)
{
	unsigned char i;
	if(pos==-1)
	{
		LCD_cmd(0x01);		//清屏
		LCD_delay(2, 249);	//2000-2 us
		pos = 0;
	}
	while(*s)
	{
		switch(*s)
		{
		case '\n':			//换行
			{	
				if(pos < 17)
				{
					for(i = pos; i < 16; i++) 
						LCD_printc(i%16, i/16, ' ');
					pos = 16;
				}
				else
				{
					for(i = pos; i < 32; i++) 
						LCD_printc(i%16, i/16, ' ');
					pos = 32;
				}
				break;
			}

		case '\b':			//退格
			{
				if(pos > 0)	pos--;
				LCD_printc(pos%16, pos/16, ' ');
				break;
			}

		default:
			{
				if(*s < 0x20) 
					*s=' ';
				LCD_printc(pos%16, pos/16, *s);
				pos++;
				break;
			}
		}
		s++;
	}
}
*/


/*--------------------------------------------------------------*/
#endif