單片機C語言教程：C51數組的使用

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

使用 1602 液晶顯示的實驗例子

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

SMC1602A(16*2)模擬口線接線方式 連接線圖:

---------------------------------------------------

|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 電阻到 GND|

---------------------------------------------------

[注:AT89S51 使用 12M 晶體震蕩器]

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

#define LCM_RW P2_0 //定義引腳

#define LCM_RS P2_1

#define LCM_E P2_2

#define LCM_Data P1

#define Busy 0x80 //用于檢測 LCM 狀態(tài)字中的 Busy 標識

#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(); //啟動等待，等 LCM 講入工作狀態(tài)

LCMInit(); //LCM 初始化

Delay5Ms(); //延時片刻(可不要)

DisplayListChar(0, 0, cdle_net); DisplayListChar(0, 1, email); ReadDataLCM();//測試用句無意義 while(1);

}

//寫數據

void WriteDataLCM(unsigned char WDLCM)

{

ReadStatusLCM(); //檢測忙 LCM_Data = WDLCM; LCM_RS = 1;

LCM_RW = 0;

LCM_E = 0; //若晶體震蕩器速度太高能在這后加小的延時

LCM_E = 0; //延時

LCM_E = 1;

}

//寫指令

void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC 為 0 時忽略忙檢測

{

if (BuysC) ReadStatusLCM(); //根據需要檢測忙

LCM_Data = WCLCM; LCM_RS = 0; LCM_RW = 0;

LCM_E = 0;

LCM_E = 0; LCM_E = 1;

}

//讀數據

unsigned char ReadDataLCM(void)

{

LCM_RS = 1; LCM_RW = 1; LCM_E = 0; LCM_E = 0; LCM_E = 1; return(LCM_Data);

}

//讀狀態(tài)

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); //檢測忙信號

return(LCM_Data);

}

void LCMInit(void) //LCM 初始化

{

LCM_Data = 0;

WriteCommandLCM(0x38,0); //三次顯示模式設置，不檢測忙信號

Delay5Ms(); WriteCommandLCM(0x38,0); Delay5Ms(); WriteCommandLCM(0x38,0); Delay5Ms();

WriteCommandLCM(0x38,1); //顯示模式設置,開始要求每次檢測忙信號

WriteCommandLCM(0x08,1); //關閉顯示 WriteCommandLCM(0x01,1); //顯示清屏 WriteCommandLCM(0x06,1); // 顯示光標移動設置 WriteCommandLCM(0x0C,1); // 顯示開及光標設置

}

//按指定位置顯示一個字符

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; //當要顯示第二行時地址碼+0x40; X |= 0x80; //算出指令碼

WriteCommandLCM(X, 0); //這里不檢測忙信號，發(fā)送地址碼

WriteDataLCM(DData);

}

//按指定位置顯示一串字符

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) //若到達字串尾則退出

{

if (X = 0xF) //X 坐標應小于 0xF

{

DisplayOneChar(X, Y, DData[ListLength]); //顯示單個字符

ListLength++; X++;

}

}

}

//5ms 延時

void Delay5Ms(void)

{

unsigned int TempCyc = 5552;

while(TempCyc--);

}

//400ms 延時

void Delay400Ms(void)

{

unsigned char TempCycA = 5; unsigned int TempCycB; while(TempCycA--)

{

TempCycB=7269;

while(TempCycB--);

};

}