单片机C语言教程：C51数组的使用

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

使用 1602 液晶显示的实验例子

==============================================================

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 晶体震荡器]

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

#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

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.xx.com};

unsigned char code email[] = {pnzwzw@xx.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, 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; //若晶体震荡器速度太高能在这后加小的延时

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--);

};

}