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使用1602液晶显示的c代码

已有 754 次阅读2016-2-5 01:12

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--);
};
}


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