运用1602液晶显示和PS/2键盘的示例

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运用1602液晶显现和PS/2键盘的示例
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SMC1602A(16*2)模仿口线接线方法
衔接线图:
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|LCM—–51 | LCM—–51 | LCM——51 |
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|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电阻到GND|
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Keyboard接线
PS/2——–51
1 DATA——P3.4
3 GND
4 VCC
5 CLK——-P3.3 接在51的外部中止，触发方法为低电平

[注:AT89x51运用12M或11.0592M晶振,实测运用11.059M
[Keil uV2 7.01编译运转经过程序中没有做键盘数据的奇偶校验]

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#include
#include “scancodes.h”

#define LCM_RW P2_1 //界说LCD引脚
#define LCM_RS P2_0
#define LCM_E P2_2
#define LCM_Data P0

#define Key_Data P3_4 //界说Keyboard引脚
#define Key_CLK P3_3

#define Busy 0x80 //用于检测LCM状况字中的Busy标识

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; //中止次数计数
static unsigned char KeyV; //键值
static unsigned char DisNum = 0; //显现用指针
static unsigned char Key_UP=0, Shift = 0;//Key_UP是键松开标识，Shift是Shift键按下标识
static unsigned char BF = 0; //标识是否有字符被收到

void main(void)
{
unsigned char TempCyc;

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, 0, cdle_net);
DisplayListChar(0, 1, email);
ReadDataLCM();//测试用句无意义
for (TempCyc=0; TempCyc<10; TempCyc++)
Delay400Ms(); //延时
DisplayListChar(0, 1, Cls);

IT1 = 0; //设外部中止1为低电平触发
EA = 1;
EX1 = 1; //开中止

do
{
if (BF)
Decode(KeyV);
else
EA = 1; //开中止
}
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(0x0F,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, 1); //发命令字
WriteDataLCM(DData); //发数据
}

//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]>0x19) //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–);
};
}

void Keyboard_out(void) interrupt 2
{
if ((IntNum > 0) && (IntNum < 9))
{
KeyV = KeyV >> 1; //因键盘数据是低>>高，结合上一句所以右移一位
if (Key_Data) KeyV = KeyV | 0x80; //当键盘数据线为1时为1到最高位
}
IntNum++;
while (!Key_CLK); //等候PS/2CLK拉高

if (IntNum > 10)
{
IntNum = 0; //当中止11次后表明一帧数据收完，清变量预备下一次接纳
BF = 1; //标识有字符输入完了
EA = 0; //关中止等显现完后再开中止 (注：如这儿不必BF和关中止直接调Decode()则所Decode中所调用的一切函数要声明为再入函数)
}
}

void Decode(unsigned char ScanCode) //留意:如SHIFT+G为12H 34H F0H 34H F0H 12H，也就是说shift的通码+G的通码+shift的断码+G的断码
{
unsigned char TempCyc;

if (!Key_UP) //当键盘松开时
{
switch (ScanCode)
{
case 0xF0 : // 当收到0xF0，Key_UP置1表明断码开端
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) //假如SHIFT没按下
{
for (TempCyc = 0;(UnShifted[TempCyc][0]!=ScanCode)&&(TempCyc<59); TempCyc++); //查表显现
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++); //查表显现
if (Shifted[TempCyc][0] == ScanCode) DisplayOneChar(DisNum, 1, Shifted[TempCyc][1]);
DisNum++;
}

break;
}
}
else
{
Key_UP = 0;
switch (ScanCode) //当键松开时不处理判码，如G 34H F0H 34H 那么第二个34H不会被处理
{
case 0x12 : // 左 SHIFT
Shift = 0;
break;

case 0x59 : // 右 SHIFT
Shift = 0;
break;
}
}
BF = 0; //标识字符处理完了
}