lcd1206.c

lcd1602的驱动程序,lcd初始化,读写数据等

/*============================================================
使用1602液晶显示的实验例子 huangstone 
============================================================== 


  TS1620-1(16*2)模拟口线接线方式
  连接线图: 
  ---------------------------------------------------
  |LCM-----51 　| LCM-----51　|　LCM-----51    |
  -------------------------------------------------------|
  |DB0-----P0.0 | DB4-----P0.4 | RW-------P2.6 |
  |DB1-----P0.1 | DB5-----P0.5 | RS--------P2.7 |
  |DB2-----P0.2 | DB6-----P0.6 | E  --------P2.5 |
  |DB3-----P0.3 | DB7-----P0.7 | VLCD接1K2电阻到GND|
  ---------------------------------------------------
  

	
	  
		[注:AT89S51使用12M晶振]
=============================================================*/
#include <REG51RD2.h>

#define LCM_RW   P2_6 //定义引脚
#define LCM_RS   P2_7
#define LCM_E    P2_5
#define LCM_Data P0
#define Busy     0x80 //用于检测LCM状态字中的Busy标识



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 cdle_net[] = {"www.haust.edu.cn" };

unsigned char code email[] = {"Hello-MCU"};

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)
	
	DisplayListChar(0, 0, cdle_net);
	DisplayListChar(0, 1, email);
	ReadDataLCM();//测试用句无意义
	while(1);
}

//写数据
void WriteDataLCM(unsigned char WDLCM)
{
	ReadStatusLCM(); //检测忙
	LCM_Data = WDLCM;
	LCM_RS = 1;
	LCM_RW = 0;
	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 = 0;
	LCM_E = 0;
	LCM_E = 1; 
}

//读数据
unsigned char ReadDataLCM(void)
{
	LCM_RS = 1; 
	LCM_RW = 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 = 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;
	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)
{
	Y &= 0x1;
	X &= 0xF; //限制X不能大于15，Y不能大于1
	if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;
	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--);
	};
}