使用1602液晶顯示和PS/2鍵盤的示例

使用1602液晶顯示和PS/2鍵盤的示例
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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-------P2.1 |
|DB1-----P1.1 | DB5-----P1.5 | RS-------P2.0 |
|DB2-----P1.2 | DB6-----P1.6 | E--------P2.2 |
|DB3-----P1.3 | DB7-----P1.7 | VLCD接1K電阻到GND|
---------------------------------------------------

Keyboard接線
PS/2--------51
1 DATA------P3.4
3 GND
4 VCC
5 CLK-------P3.3 接在51的外部中斷，觸發(fā)方式為低電平

[注:AT89x51使用12M或11.0592M晶振,實測使用11.059M
[Keil uV2 7.01編譯運行通過程序中沒有做鍵盤數(shù)據的奇偶校驗]

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#include
#include "scancodes.h"

#define LCM_RW P2_1 //定義LCD引腳
#define LCM_RS P2_0
#define LCM_E P2_2
#define LCM_Data P0

#define Key_Data P3_4 //定義Keyboard引腳
#define Key_CLK P3_3

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

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);
void Decode(unsigned char ScanCode);
void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM,BuysC);

unsigned char ReadDataLCM(void);
unsigned char ReadStatusLCM(void);
unsigned char code cdle_net[] = {"www.pp51.com "};
unsigned char code email[] = {"pp51com@163.com"};
unsigned char code Cls[] = {" "};
static unsigned char IntNum = 0; //中斷次數(shù)計數(shù)
static unsigned char KeyV; //鍵值
static unsigned char DisNum = 0; //顯示用指針
static unsigned char Key_UP=0, Shift = 0;//Key_UP是鍵松開標識，Shift是Shift鍵按下標識
static unsigned char BF = 0; //標識是否有字符被收到

void main(void)
{
unsigned char TempCyc;

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
for (TempCyc=0; TempCyc<10; TempCyc++)
Delay400Ms(); //延時
DisplayListChar(0, 1, Cls);

IT1 = 0; //設外部中斷1為低電平觸發(fā)
EA = 1;
EX1 = 1; //開中斷

do
{
if (BF)
Decode(KeyV);
else
EA = 1; //開中斷
}
while(1);
}

//寫數(shù)據
void WriteDataLCM(unsigned char WDLCM)
{
ReadStatusLCM(); //檢測忙
LCM_Data = WDLCM;
LCM_RS = 1;
LCM_RW = 0;
LCM_E = 0; //若晶振速度太高可以在這后加小的延時
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(shù)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(0x0F,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, 1); //發(fā)命令字
WriteDataLCM(DData); //發(fā)數(shù)據
}

//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]>0x19) //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--);
};
}

void Keyboard_out(void) interrupt 2
{
if ((IntNum > 0) && (IntNum < 9))
{
KeyV = KeyV >> 1; //因鍵盤數(shù)據是低>>高，結合上一句所以右移一位
if (Key_Data) KeyV = KeyV | 0x80; //當鍵盤數(shù)據線為1時為1到最高位
}
IntNum++;
while (!Key_CLK); //等待PS/2CLK拉高

if (IntNum > 10)
{
IntNum = 0; //當中斷11次后表示一幀數(shù)據收完，清變量準備下一次接收
BF = 1; //標識有字符輸入完了
EA = 0; //關中斷等顯示完后再開中斷 (注：如這里不用BF和關中斷直接調Decode()則所Decode中所調用的所有函數(shù)要聲明為再入函數(shù))
}
}

void Decode(unsigned char ScanCode) //注意:如SHIFT+G為12H 34H F0H 34H F0H 12H，也就是說shift的通碼+G的通碼+shift的斷碼+G的斷碼
{
unsigned char TempCyc;

if (!Key_UP) //當鍵盤松開時
{
switch (ScanCode)
{
case 0xF0 : // 當收到0xF0，Key_UP置1表示斷碼開始
Key_UP = 1;
break;

case 0x12 : // 左 SHIFT
Shift = 1;
break;

case 0x59 : // 右 SHIFT
Shift = 1;
break;

default:
if (DisNum > 15)
{
DisplayListChar(0, 1, Cls);//清LCD第二行
DisNum = 0;
}
if(!Shift) //如果SHIFT沒按下
{
for (TempCyc = 0;(UnShifted[TempCyc][0]!=ScanCode)&&(TempCyc<59); TempCyc++); //查表顯示
if (UnShifted[TempCyc][0] == ScanCode) DisplayOneChar(DisNum, 1, UnShifted[TempCyc][1]);
DisNum++;
}
else //按下SHIFT
{
for(TempCyc = 0; (Shifted[TempCyc][0]!=ScanCode)&&(TempCyc<59); TempCyc++); //查表顯示
if (Shifted[TempCyc][0] == ScanCode) DisplayOneChar(DisNum, 1, Shifted[TempCyc][1]);
DisNum++;
}

break;
}
}
else
{
Key_UP = 0;
switch (ScanCode) //當鍵松開時不處理判碼，如G 34H F0H 34H 那么第二個34H不會被處理
{
case 0x12 : // 左 SHIFT
Shift = 0;
break;

case 0x59 : // 右 SHIFT
Shift = 0;
break;
}
}
BF = 0; //標識字符處理完了
}