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1602液晶显示模块C语言程序(8位)

发布时间:2020-08-31 发布时间:
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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

#i nclude

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--);
};
}

关键字:1602液晶  显示模块

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