lcd_parallel.c

51单片机的1602液晶显示程序

#include  "reg52.h"

sbit LCD_RS= P2^0;
sbit LCD_RW= P2^1; //定义引脚
sbit LCD_E= P2^2;

#define LCD_Data P0
#define Busy 0x80 //用于检测LCD状态字中的Busy标识



void WriteDataLCD(unsigned char WDLCD);
void WriteCommandLCD(unsigned char WCLCD,BuysC);
unsigned char ReadDataLCD(void);
unsigned char ReadStatusLCD(void);
void LCDInit(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.cdle.net"};
unsigned char code email[] = {"[e-mail]"};

void main(void)
{
Delay400Ms(); //启动等待，等LCD讲入工作状态
LCDInit(); //LCD初始化
Delay5Ms(); //延时片刻(可不要)

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

//写数据
void WriteDataLCD(unsigned char WDLCD)
{
ReadStatusLCD(); //检测忙
LCD_Data = WDLCD;
LCD_RS = 1;
LCD_RW = 0;
LCD_E = 0; //若晶振速度太高可以在这后加小的延时
LCD_E = 0; //延时
LCD_E = 1;
}

//写指令
void WriteCommandLCD(unsigned char WCLCD,BuysC) //BuysC为0时忽略忙检测
{
if (BuysC) ReadStatusLCD(); //根据需要检测忙
LCD_Data = WCLCD;
LCD_RS = 0;
LCD_RW = 0; 
LCD_E = 0;
LCD_E = 0;
LCD_E = 1; 
}

//读数据
unsigned char ReadDataLCD(void)
{
LCD_RS = 1; 
LCD_RW = 1;
LCD_E = 0;
LCD_E = 0;
LCD_E = 1;
return(LCD_Data);
}

//读状态
unsigned char ReadStatusLCD(void)
{
LCD_Data = 0xFF; 
LCD_RS = 0;
LCD_RW = 1;
LCD_E = 0;
LCD_E = 0;
LCD_E = 1;
while (LCD_Data & Busy); //检测忙信号
return(LCD_Data);
}

void LCDInit(void) //LCD初始化
{
LCD_Data = 0;
WriteCommandLCD(0x38,0); //三次显示模式设置，不检测忙信号
Delay5Ms(); 
WriteCommandLCD(0x38,0);
Delay5Ms(); 
WriteCommandLCD(0x38,0);
Delay5Ms(); 

WriteCommandLCD(0x38,1); //显示模式设置,开始要求每次检测忙信号
WriteCommandLCD(0x08,1); //关闭显示
WriteCommandLCD(0x01,1); //显示清屏
WriteCommandLCD(0x06,1); // 显示光标移动设置
WriteCommandLCD(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
WriteCommandLCD(X, 0); //这里不检测忙信号，发送地址码
WriteDataLCD(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--);
	}
}