#include <at89c51rd2.h>

sbit _WR=P2^0;
sbit _RD=P2^1;
sbit CD=P2^2;

u8 lcmRecvData()
{
	u8 t;
	P0=0xff;
	CD=0;
	_RD=0;
	t=P0;
	_RD=1;
	return(t);
}

u8 lcmCheckStatus(u8 a,u8 s)
{
	u8 t;
	P0=0xff;
	CD=1;
	_RD=0;
	t=P0;
	_RD=1;
	return((t&a)-s);
}

void lcmSendData(u8 d)
{
	CD=0;
	P0=d;
	_WR=0;
	_WR=1;
	P0=0xff;
}

void lcmSendCmd(u8 c)
{
	CD=1;
	P0=c;
	_WR=0;
	_WR=1;
	P0=0xff;
}

void lcmWriteData(u8 d1,u8 d2,u8 c,u8 n)	
{
	if(n==2)
		{
		while(lcmCheckStatus(3,3));
		lcmSendData(d1);
		}
	if((n==2)||(n==1))
		{
		while(lcmCheckStatus(3,3));
		lcmSendData(d2);
		}
	while(lcmCheckStatus(3,3));
	lcmSendCmd(c);
}

u8 lcmReadData()
{
	while(lcmCheckStatus(3,3));
	return(lcmRecvData());
}

void lcmInit()
{
//	P0=0xff;
	_WR=1;
	_RD=1;
	CD=1;
	lcmWriteData(0x00,0x00,0x40,2);	//設置文本顯示首地址
	lcmWriteData(0x14,0x00,0x41,2);	//設置文本顯示寬度
	lcmWriteData(0x40,0x01,0x42,2);	//設置圖形顯示首地址
	lcmWriteData(0x14,0x00,0x43,2);	//設置圖形顯示寬度
	lcmWriteData(0x00,0x00,0xa1,0);	//光標形狀設置
	lcmWriteData(0x00,0x00,0x80,0);	//顯示方式設置，“或”
	lcmWriteData(0x00,0x00,0x9c,0);	//顯示開關設置
}