#define LCM_RW P2_0 //定義引腳
#define LCM_RS P2_1
#define LCM_E P2_2
#define LCM_Data P1
#define Busy 0x80 //用于檢測LCM 狀態字中的Busy 標識
#include <at89x51.h>
void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM,BuysC);
unsigned char ReadDataLCM(void);
unsigned char ReadStatusLCM(void);
void LCMInit(void);
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
void Delay5Ms(void);
void Delay400Ms(void);

unsigned char code s[][2][17] =
{

	{
	"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff",
	"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
	},
	{
		"XXXXXXXXXXXXXXXX",
		"XXXXXXXXXXXXXXXX"
	},
	{
		"YYYYYYYYYYYYYYYY",
		"YYYYYYYYYYYYYYYY"
	},
	{
		"ZZZZZZZZZZZZZZZZ",
		"ZZZZZZZZZZZZZZZZ"
	},
	{	
		"www.xxxx.net    ",
		"xxxx@xxxx.net "
	},
	{ 
		{0},
		{0}
	}
};

void main(void)
{
Delay400Ms(); //啟動等待，等LCM 講入工作狀態
LCMInit(); //LCM 初始化

Delay5Ms(); //延時片刻(可不要)

while(1)
{
DisplayListChar(0, 0, s[0][0]);
DisplayListChar(0, 1, s[0][1]);
ReadDataLCM();//測試用句無意義
Delay400Ms();
WriteCommandLCM(0x02,0);
DisplayListChar(0, 0, s[1][0]);
DisplayListChar(0, 1, s[1][1]);
ReadDataLCM();//測試用句無意義
Delay400Ms();
WriteCommandLCM(0x02,0);
DisplayListChar(0, 0, s[2][0]);
DisplayListChar(0, 1, s[2][1]);
ReadDataLCM();//測試用句無意義
Delay400Ms();
WriteCommandLCM(0x02,0);
DisplayListChar(0, 0, s[3][0]);
DisplayListChar(0, 1, s[3][1]);
ReadDataLCM();//測試用句無意義
Delay400Ms();
WriteCommandLCM(0x02,0);
DisplayListChar(0, 0, s[4][0]);
DisplayListChar(0, 1, s[4][1]);
ReadDataLCM();//測試用句無意義
Delay400Ms();
WriteCommandLCM(0x02,0);
}

}
//寫數據
void WriteDataLCM(unsigned char WDLCM)
{
ReadStatusLCM(); //檢測忙
LCM_Data = WDLCM;
LCM_RS = 1;
LCM_RW = 0;
LCM_E = 1;
LCM_E = 0; //若晶振速度太高可以在這后加小的延時
LCM_E = 0; //延時
LCM_E = 1;
}
//寫指令
void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC 為0 時忽略忙檢測
{
if (BuysC) ReadStatusLCM(); //根據需要檢測忙
LCM_Data = WCLCM;
LCM_RS = 0;
LCM_RW = 0;
LCM_E = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
}
//讀數據
unsigned char ReadDataLCM(void)
{
LCM_RS = 1;
LCM_RW = 1;
LCM_E = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
return(LCM_Data);
}
//讀狀態
unsigned char ReadStatusLCM(void)
{
LCM_Data = 0xFF;
LCM_RS = 0;
LCM_RW = 1;
LCM_E = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
while (LCM_Data & Busy); //檢測忙信號
return(LCM_Data);
}
void LCMInit(void) //LCM 初始化
{
LCM_Data = 0;
LCM_E = 1;
WriteCommandLCM(0x38,0); //三次顯示模式設置，不檢測忙信號
Delay5Ms();
WriteCommandLCM(0x38,0);
Delay5Ms();
WriteCommandLCM(0x38,0);
Delay5Ms();
WriteCommandLCM(0x38,1); //顯示模式設置,開始要求每次檢測忙信號
WriteCommandLCM(0x08,1); //關閉顯示
WriteCommandLCM(0x01,1); //顯示清屏
WriteCommandLCM(0x06,1); // 顯示光標移動設置
WriteCommandLCM(0x0C,1); // 顯示開及光標設置
}
//按指定位置顯示一個字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
X &= 0xF; //限制X 不能大于15，Y 不能大于1

if (Y&0x01) 	X |= 0xC0; //當要顯示第二行時地址碼+0x40;
else 	X |= 0x80; //算出指令碼

WriteCommandLCM(X, 0); //這里不檢測忙信號，發送地址碼
WriteDataLCM(DData);
}
//按指定位置顯示一串字符
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
{
unsigned char ListLength;
ListLength = 0;
Y &= 0x1;
X &= 0xF; //限制X 不能大于15，Y 不能大于1
while (DData[ListLength]>=0x20) //若到達字串尾則退出
{
if (X <= 0xF) //X 坐標應小于0xF
{
DisplayOneChar(X, Y, DData[ListLength]); //顯示單個字符
ListLength++;
X++;
}
}
}
//5ms 延時
void Delay5Ms(void)
{
unsigned int TempCyc = 5552;
while(TempCyc--);
}
//400ms 延時
void Delay400Ms(void)
{
unsigned char TempCycA = 5;
unsigned int TempCycB;
while(TempCycA--)
{
TempCycB=7269;
while(TempCycB--);
};
}