main.c

at89c51 操作 1602 LCD 的 C源代码

#define LCM_RW P2_0 //定义引脚
#define LCM_RS P2_1
#define LCM_E P2_2
#define LCM_Data P1
#define Busy 0x80 //用于检测LCM 状态字中的Busy 标识
#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    ",
		"[e-mail] "
	},
	{ 
		{0},
		{0}
	}
};

void main(void)
{
Delay400Ms(); //启动等待，等LCM 讲入工作状态
LCMInit(); //LCM 初始化

Delay5Ms(); //延时片刻(可不要)

while(1)
{
DisplayListChar(0, 0, s[0][0]);
DisplayListChar(0, 1, s[0][1]);
ReadDataLCM();//测试用句无意义
Delay400Ms();
WriteCommandLCM(0x02,0);
DisplayListChar(0, 0, s[1][0]);
DisplayListChar(0, 1, s[1][1]);
ReadDataLCM();//测试用句无意义
Delay400Ms();
WriteCommandLCM(0x02,0);
DisplayListChar(0, 0, s[2][0]);
DisplayListChar(0, 1, s[2][1]);
ReadDataLCM();//测试用句无意义
Delay400Ms();
WriteCommandLCM(0x02,0);
DisplayListChar(0, 0, s[3][0]);
DisplayListChar(0, 1, s[3][1]);
ReadDataLCM();//测试用句无意义
Delay400Ms();
WriteCommandLCM(0x02,0);
DisplayListChar(0, 0, s[4][0]);
DisplayListChar(0, 1, s[4][1]);
ReadDataLCM();//测试用句无意义
Delay400Ms();
WriteCommandLCM(0x02,0);
}

}
//写数据
void WriteDataLCM(unsigned char WDLCM)
{
ReadStatusLCM(); //检测忙
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这后加小的延时
LCM_E = 0; //延时
LCM_E = 1;
}
//写指令
void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC 为0 时忽略忙检测
{
if (BuysC) ReadStatusLCM(); //根据需要检测忙
LCM_Data = WCLCM;
LCM_RS = 0;
LCM_RW = 0;
LCM_E = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
}
//读数据
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);
}
//读状态
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); //检测忙信号
return(LCM_Data);
}
void LCMInit(void) //LCM 初始化
{
LCM_Data = 0;
LCM_E = 1;
WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号
Delay5Ms();
WriteCommandLCM(0x38,0);
Delay5Ms();
WriteCommandLCM(0x38,0);
Delay5Ms();
WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号
WriteCommandLCM(0x08,1); //关闭显示
WriteCommandLCM(0x01,1); //显示清屏
WriteCommandLCM(0x06,1); // 显示光标移动设置
WriteCommandLCM(0x0C,1); // 显示开及光标设置
}
//按指定位置显示一个字符
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; //当要显示第二行时地址码+0x40;
else 	X |= 0x80; //算出指令码

WriteCommandLCM(X, 0); //这里不检测忙信号，发送地址码
WriteDataLCM(DData);
}
//按指定位置显示一串字符
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) //若到达字串尾则退出
{
if (X <= 0xF) //X 坐标应小于0xF
{
DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符
ListLength++;
X++;
}
}
}
//5ms 延时
void Delay5Ms(void)
{
unsigned int TempCyc = 5552;
while(TempCyc--);
}
//400ms 延时
void Delay400Ms(void)
{
unsigned char TempCycA = 5;
unsigned int TempCycB;
while(TempCycA--)
{
TempCycB=7269;
while(TempCycB--);
};
}