1602液晶显示模块C言语程序（8位）

SMC1602A(16*2)模仿口线接线方法

衔接线图:
—————————————————
|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运用12M晶振]
=============================================================*/

#define LCM_RW P2_0 //界说引脚
#define LCM_RS P2_1
#define LCM_E P2_2
#define LCM_Data P1
#define Busy 0x80 //用于检测LCM状况字中的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(); //发动等候，等LCM讲入作业状况
LCMInit(); //LCM初始化
Delay5Ms(); //延时顷刻(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; //若晶振速度太高能够在这后加小的延时
LCM_E = 0; //延时
LCM_E = 1;
}

//写指令
void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时疏忽忙检测
{
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);
}

//读状况
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); //三次显现形式设置，不检测忙信号
Delay5Ms();
WriteCommandLCM(0x38,0);
Delay5Ms();
WriteCommandLCM(0x38,0);
Delay5Ms();

WriteCommandLCM(0x38,1); //显现形式设置,开端要求每次检测忙信号
WriteCommandLCM(0x08,1); //封闭显现
WriteCommandLCM(0x01,1); //显现清屏
WriteCommandLCM(0x06,1); // 显现光标移动设置
WriteCommandLCM(0x0C,1); // 显现开及光标设置
}

//按指定方位显现一个字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
Y &= 0x1;
X &= 0xF; //约束X不能大于15，Y不能大于1
if (Y) X |= 0x40; //当要显现第二行时地址码+0x40;
X |= 0x80; // 算出指令码
WriteCommandLCM(X, 0); //这儿不检测忙信号，发送地址码
WriteDataLCM(DData);
}

//按指定方位显现一串字符
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
{
unsigned char ListLength;

ListLength = 0;
Y &= 0x1;
X &= 0xF; //约束X不能大于15，Y不能大于1
while (DData[ListLength]>0x20) //若抵达字串尾则退出
{
if (X <= 0xF) //X坐标应小于0xF
{
DisplayOneChar(X, Y, DData[ListLength]); //显现单个字符
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–);
};
}