使用1602液晶显示的c代码

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]

=============================================================*/

# include <at89x51.h>

# 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

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 uctech[] = {"uctech"};

unsigned char code net[] = {"uctech.icpcn.com"};

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);

}

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--);

};

}