1602.c

Keil C51单片机基础实验源程序

/******************************************
程序功能：熟悉并使用液晶1602显示我们需要的字符
          这里我们要显示的是"Fuzhou university"
*******************************************/

#define LCM_RW  P0_4 //定义引脚 
#define LCM_RS  P0_5 
#define LCM_E   P0_3
#define LCM_Data  P2 
#define Busy    0x80 //用于检测LCM状态字中的Busy标识 

#include <AT89X52.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 net[] = {"Fuzhou"}; 
unsigned char code uctech[] = {"university"}; 


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, 5, uctech); 
 DisplayListChar(0, 0, net); 
 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); 
} 


//LCM初始化
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--); 
 }; 
}