ps2key.c
/*============================================================
使用1602液晶顯示和PS/2鍵盤的示例 明浩 2004/2
-------------------------------------------------
http://www.cdle.net http://bbs.cdle.net/
==============================================================

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|
---------------------------------------------------

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

本程式源碼只供學(xué)習(xí)參考，不得應(yīng)用于商業(yè)用途，如有需要請聯(lián)系作者。

[注:AT89x51使用12M或11.0592M晶振 實測使用11.0592M]
[Keil uV2 7.01編譯運行通過 程式中沒有做鍵盤數(shù)據(jù)的奇偶校驗]

=============================================================*/
#include
#include "scancodes.h"

#define LCM_RW P2_0 //定義LCD引腳
#define LCM_RS P2_1
#define LCM_E P2_2
#define LCM_Data P1

#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(biāo)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.cdle.net--"};
unsigned char code email[] = {"pnzwzw@cdle.net"};
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(biāo)識，Shift是Shift鍵按下標(biāo)識
static unsigned char BF = 0; //標(biāo)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(shè)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(jù)
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(jù)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(jù)
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(shè)置，不檢測忙信號
Delay5Ms();
WriteCommandLCM(0x38 0 0 style="LINE-HEIGHT: 150%">WriteCommandLCM(0x38 1 //顯示模式設(shè)置 開始需求每次檢測忙信號
WriteCommandLCM(0x08 1 //關(guān)閉顯示
WriteCommandLCM(0x01 1 //顯示清屏
WriteCommandLCM(0x06 1 // 顯示光標(biāo)移動設(shè)置
WriteCommandLCM(0x0F 1 // 顯示開及光標(biāo)設(shè)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(dāng)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(jù)
}

//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(biāo)應(yīng)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(jù)是低>>高，結(jié)合上一句所以右移一位
if (Key_Data) KeyV = KeyV | 0x80; //當(dāng)鍵盤數(shù)據(jù)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(dāng)中斷11次后表示一幀數(shù)據(jù)收完，清變量準(zhǔn)備下一次接收
BF = 1; //標(biāo)識有字符輸入完了
EA = 0; //關(guān)中斷等顯示完后再開中斷 (注：如這里不用BF和關(guān)中斷直接調(diào)Decode()則所Decode中所調(diào)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(dāng)鍵盤松開時
{
switch (ScanCode)
{
case 0xF0 : // 當(dāng)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(dāng)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(biāo)識字符處理完了
}

scancodes.h

unsigned char code UnShifted[59][2] = {
0x1C 'a'
0x32 'b'
0x21 'c'
0x23 'd'
0x24 'e'
0x2B 'f'
0x34 'g'
0x33 'h'
0x43 'i'
0x3B 'j'
0x42 'k'
0x4B 'l'
0x3A 'm'
0x31 'n'
0x44 'o'
0x4D 'p'
0x15 'q'
0x2D 'r'
0x1B 's'
0x2C 't'
0x3C 'u'
0x2A 'v'
0x1D 'w'
0x22 'x'
0x35 'y'
0x1A 'z'
0x45 '0'
0x16 '1'
0x1E '2'
0x26 '3'
0x25 '4'
0x2E '5'
0x36 '6'
0x3D '7'
0x3E '8'
0x46 '9'
0x0E '`'
0x4E '-'
0x55 '='
0x5D '\'
0x29 ' '
0x54 '['
0x5B ']'
0x4C ';'
0x52 '''
0x41 ' '
0x49 '.'
0x4A '/'
0x71 '.'
0x70 '0'
0x69 '1'
0x72 '2'
0x7A '3'
0x6B '4'
0x73 '5'
0x74 '6'
0x6C '7'
0x75 '8'
0x7D '9'
};

unsigned char code Shifted[59][2] = {
0x1C 'A'
0x32 'B'
0x21 'C'
0x23 'D'
0x24 'E'
0x2B 'F'
0x34 'G'
0x33 'H'
0x43 'I'
0x3B 'J'
0x42 'K'
0x4B 'L'
0x3A 'M'
0x31 'N'
0x44 'O'
0x4D 'P'
0x15 'Q'
0x2D 'R'
0x1B 'S'
0x2C 'T'
0x3C 'U'
0x2A 'V'
0x1D 'W'
0x22 'X'
0x35 'Y'
0x1A 'Z'
0x45 '0'
0x16 '1'
0x1E '2'
0x26 '3'
0x25 '4'
0x2E '5'
0x36 '6'
0x3D '7'
0x3E '8'
0x46 '9'
0x0E '~'
0x4E '_'
0x55 '+'
0x5D '|'
0x29 ' '
0x54 '{'
0x5B '}'
0x4C ':'
0x52 '"'
0x41 '<'
0x49 '>'
0x4A '?'
0x71 '.'
0x70 '0'
0x69 '1'
0x72 '2'
0x7A '3'
0x6B '4'
0x73 '5'
0x74 '6'
0x6C '7'
0x75 '8'
0x7D '9'
};