1602xs.c

1602显示程序,可显示123.要修改引脚连接.

#define LCD_RW  P1_1 //定义引脚
#define LCD_RS  P1_0
#define LCD_E   P1_2
#define LCD_Data  P0
#define Busy    0x80 //用于检测LCD状态字中的Busy标识

#include <at89x52.h>

void WriteDataLCD(unsigned char WDLCD);
void WriteCommandLCD(unsigned char WCLCD,unsigned char 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 Delay(unsigned int i);


unsigned char code A[] = {"123"};


void main(void)
{
 Delay(400); //启动等待，等LCD讲入工作状态
 LCDInit(); //LCD初始化
 Delay(5); //延时片刻(可不要)

 DisplayListChar(0, 0, A);
 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,unsigned char 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
 Delay(5); 
 WriteCommandLCD(0x38,0);
 Delay(5); 
 WriteCommandLCD(0x38,0);
 Delay(5); 

 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++;
    }
  }
}

void Delay(unsigned int i)   //不精确延时 Delay(1000);大概延时一秒
{
     unsigned int j;
     for(;i>0;i--)
     for(j=0;j<125;j++)
     {;}
}