/*------------------------------------------------------------------------------*/
//File:	LCD1602_8.H
//Date:	08-7-29
//Time:	16:09
//Note:	LCD1602 Mini Driver. 




/*------------------------------------------------------------------------------*/
#ifndef __LCD1602_8_H__
#define __LCD1602_8_H__





/*------------------------------------------------------------------------------*/
//LCD接口定義					
sfr		 io	= 0x80;				//P0-0x80,P1-0x90,P2-0xA0,P3-0xB0;
sbit	 rs = P2^0;				//LCD數(shù)據(jù)/命令選擇端(H/L)
sbit	 rw = P2^1;				//LCD讀/寫(xiě)選擇端(H/L)
sbit	 ep = P2^2;				//LCD使能控制
sbit     bz = io^7;				//LCD忙標(biāo)志位





/*------------------------------------------------------------------------------*/
//函數(shù)聲明		
void lcd_busy(void);					//測(cè)試LCD忙碌狀態(tài)程序
void lcd_wcmd(unsigned char cmd);		//寫(xiě)入指令到LCD程序
void lcd_wdat(unsigned char dat);		//寫(xiě)入數(shù)據(jù)到LCD程序
void lcd_pos (unsigned char x, bit y);	//LCD數(shù)據(jù)指針位置程序
void printc(unsigned char CHAR);		//顯示字符
//void prints(unsigned char *string);		//顯示字符串
void lcd_init(void);					//LCD初始化設(shè)定程序



/*------------------------------------------------------------------------------*/
//測(cè)試LCD忙碌狀態(tài)
void lcd_busy(void)
{	
	do{
		ep = 0;
		rs = 0;		//指令
		rw = 1;		//讀出
		io = 0xff;
		ep = 1;
		_nop_();	//高電平讀出	1us	
	}while(bz);		//bz=1表示忙,bz=0表示空閑
	ep = 0;		
}




/*------------------------------------------------------------------------------*/
//寫(xiě)入指令到LCD
void lcd_wcmd(unsigned char cmd)
{							
	lcd_busy();	//檢測(cè)忙
	rs = 0;		//指令
	rw = 0;		//寫(xiě)入
	ep = 1;	
	io = cmd;	//指令
	ep = 0;		//下降沿有效	
}




/*------------------------------------------------------------------------------*/
//寫(xiě)入數(shù)據(jù)函數(shù)
void lcd_wdat(unsigned char Data)
{
	lcd_busy();  //檢測(cè)忙
	rs = 1;		 //數(shù)據(jù)
	rw = 0;		 //寫(xiě)入
	ep = 1;
	io = Data;	 //數(shù)據(jù)
	ep = 0;		 //下降沿有效
}




/*------------------------------------------------------------------------------*/
//LCD數(shù)據(jù)指針位置程序
void lcd_pos(unsigned char x, bit y)
{						
	if(y)lcd_wcmd(x|0xc0);	//y=1,第二行顯示;y=0,第一行顯示		0<=x<16
	else lcd_wcmd(x|0x80);	//數(shù)據(jù)指針=80+地址碼(00H~27H,40H~67H)
}




/*------------------------------------------------------------------------------*/
//顯示字符
void printc(unsigned char CHAR)
{
	lcd_wdat(CHAR);
}




/*------------------------------------------------------------------------------*/
//顯示字符串
/*
void prints(unsigned char *string)
{
	unsigned char i;
	//do{lcd_wdat(string[i]);i++;}while(string[i]!='\0');//生成代碼比f(wàn)or循環(huán)大
	for(i=0;string[i]!='\0';i++)lcd_wdat(string[i]);	 //有時(shí)用for循環(huán)也好哈
}
*/



/*------------------------------------------------------------------------------*/
//LCD初始化設(shè)定
void lcd_init()
{						
	lcd_wcmd(0x38);		//設(shè)置LCD為16X2顯示,5X7點(diǎn)陣,八位數(shù)據(jù)接口
	lcd_wcmd(0x06);		//LCD顯示光標(biāo)移動(dòng)設(shè)置(光標(biāo)地址指針加1,整屏顯示不移動(dòng))
	lcd_wcmd(0x0c);		//LCD開(kāi)顯示及光標(biāo)設(shè)置(光標(biāo)不閃爍,不顯示"_")
	lcd_wcmd(0x01);		//清除LCD的顯示內(nèi)容
}


#endif