1602(c).txt

温度的动态显示

使用1602液晶显示的实验例子 
/*============================================================ 
使用1602液晶显示的实验例子 明浩 2004/2/27 
==============================================================  
SMC1602A(16*2)模拟口线接线方式 
连接线图:  
--------------------------------------------------- 
|LCM-----51 　| LCM-----51　　|　LCM------51 | 
---------------------------------------------| 
|DB0-----P1.0 | DB4-----P1.4 | RW-------P2.0 | 
|DB1-----P1.1 | DB5-----P1.5 | RS-------P2.1 | 
|DB2-----P1.2 | DB6-----P1.6 | E--------P2.2 | 
|DB3-----P1.3 | DB7-----P1.7 | VLCD接1K电阻到GND| 
--------------------------------------------------- 
[注:AT89S51使用12M晶振] 
=============================================================*/ 


#define LCM_RW P2_0 //定义引脚 
#define LCM_RS P2_1 
#define LCM_E P2_2 
#define LCM_Data P1 
#define Busy 0x80 //用于检测LCM状态字中的Busy标识 

#include <at89x51.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 cdle_net[] = {"www.cdle.net"}; 
unsigned char code email[] = {"[e-mail]"}; 

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--); 
}; 
}