1602.c

LCD1602厂家说明书+例子程序

#include <reg51.h>
#include <intrins.h>
//#include <at89x51.h>

sbit LCD_RS=P1^0;//定义引脚
sbit LCD_RW=P1^1;
sbit LCD_E=P1^2;
#define LCD_Data P2
#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 uctech[] = {"ic2012.taobao.co"};
unsigned char code net[] = {"Happy every day!"};

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

 DisplayListChar(0, 0, uctech);
 DisplayListChar(0, 5, net);
 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) //LCM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--);
 };
}