51單片機(jī)模擬PS2協(xié)議制作5X5矩陣工業(yè)鍵盤

ID:76127 · 發(fā)表于 2015-4-18 00:40

根據(jù)客戶的要求利用單片機(jī)制作一個(gè)小的工控鍵盤，將下面對(duì)應(yīng)的鍵值發(fā)送到電腦顯示，利用的協(xié)議就是PS2,單片機(jī)型號(hào)為stc89c52rc，晶振為12M；

			1	0
6	5	4	3	2
7	8	9	減號(hào)	等號(hào)
y	u	i	o	p
q	w	e	r	t

#include <reg51.h>
#include "PS2.H"

BYTE PS2RecChar=0xCC;
BOOL KeyBoardFlag=FALSE;
#define Key_line P0 //鍵盤行入口
#define Key_list P2 //鍵盤列入口

#define PS2_1    0  //16
#define PS2_0    1 //45
#define PS2_6    2 //36
#define PS2_5    3  //2e
#define PS2_4    4 //25
#define PS2_3    5 //26
#define PS2_2    6 //1e
#define PS2_7    7 //3d
#define PS2_8    8 //3e
#define PS2_9    9 //46
#define PS2_dec 10 //4e
#define PS2_eq    11 //55
#define PS2_y    12 //35
#define PS2_u    13  //3c
#define PS2_i    14 //43
#define PS2_o    15 //44
#define PS2_p    16  //4d
#define PS2_q    17 //15
#define PS2_w    18  //1d
#define PS2_e    19 //24
#define PS2_r    20 //2d
#define PS2_t    21 //2c

//第二套鍵盤碼

unsigned char PS2Value[22]={0x16,0x45,0x36,0x2e,0x25,0x26,0x1e,0x3d,0x3e,0x46,0x4e,0x55,0x35,0x3c,
      0x43,0x44,0x4d,0x15,0x1d,0x24,0x2d,0x2c};

unsigned char Key_Press(void)
{
unsigned temp3;
unsigned char flag=0; //設(shè)定標(biāo)志位
Key_line=0xe0;       //將P0口低5位全部設(shè)置位0
temp3=Key_list;    //讀取P2口的狀態(tài)，若果P2口的值temp3：(temp3&0xff)!=0xff成立，表示有鍵按下
if(((temp3&0xff)!=0xff))  //有鍵按下條件判斷
{
flag=1;
//Key_line=0XFF;    //清零鍵盤行端口
Key_list=0xff;       //清零鍵盤列端口
}
else
flag=0;       //無(wú)鍵按下標(biāo)志
return flag;
}
void delay(unsigned int ms)
{
unsigned int i,j;
for(i=ms;i>0;i--)
  for(j=100;j>0;j--);
}

unsigned char Key_Scan(void)
{
unsigned char temp2=0,temp3=0; //temp2用來(lái)保存行鍵盤數(shù)據(jù)，temp3保存列鍵盤數(shù)據(jù)
unsigned char temp=0,flag=0;    //函數(shù)返回值temp
unsigned char i=0,key=0; //i位循環(huán)控制變量，給行送數(shù)據(jù)，key保存檢測(cè)鍵盤按下的標(biāo)志位
if((key=Key_Press())!=0) //判斷是否有鍵按下
{
  delay(30);
  if((key=Key_Press())!=0)
  {
for(i=0x01;i!=0x20;i=i<<1)  //循環(huán)控制變量，掃描5行
{
   Key_line=(~i);       //將循環(huán)控制變量賦值行地址
   temp2 =(~i);    //保存行地址
   //temp2=Key_line;
   temp3=Key_list;    //讀取列地址數(shù)據(jù)
   switch((temp3&0xff)) //判斷是那列有鍵按下
   {
   case 0xfe: //第一列有鍵按下
   switch((temp2&0xff)) //判斷第一列有鍵按下時(shí)，對(duì)應(yīng)的行按鍵
   {
      case 0xfe:
      temp=23; //第一行有鍵按下
      break;  //該鍵無(wú)鍵盤號(hào)定義
      case 0xfd: //第二行有鍵按下
      temp=PS2_6;flag=1;  //對(duì)應(yīng)鍵值位PS2鍵盤的數(shù)字6，對(duì)應(yīng)的鍵盤掃描碼為0x36
      break;
      case 0xfb: //第三行有鍵按下
      temp=PS2_7; flag=1;//對(duì)應(yīng)鍵值位PS2鍵盤的數(shù)字7，對(duì)應(yīng)的鍵盤掃描碼為0x3d
      break;
      case 0xf7: //第四行有鍵按下
      temp=PS2_y; flag=1; //對(duì)應(yīng)鍵值位PS2鍵盤的字母y，對(duì)應(yīng)的鍵盤掃描碼為0x35
      break;
      case 0xef: //第五行有鍵按下
      temp=PS2_q ;flag=1;  //對(duì)應(yīng)鍵值位PS2鍵盤的字母q，對(duì)應(yīng)的鍵盤掃描碼為0x15
      break;
   }
   break;

   case 0xfd:
   switch((temp2&0xff))    // 第二列有鍵按下
   {
      case 0xfe:    //第一行有鍵按下
      temp=23;  //該鍵無(wú)鍵盤號(hào)定義
               break;
      case 0xfd:    //第二行有鍵按下
      temp=PS2_5;flag=1;  //對(duì)應(yīng)鍵值位PS2鍵盤的數(shù)字5，對(duì)應(yīng)的鍵盤掃描碼為0x2e
      break;
      case 0xfb:    //第三行有鍵按下
      temp=PS2_8; flag=1;  //對(duì)應(yīng)鍵值位PS2鍵盤的數(shù)字8，對(duì)應(yīng)的鍵盤掃描碼為0x8e
      break;
      case 0xf7:    //第四行有鍵按下
      temp=PS2_u;flag=1; //對(duì)應(yīng)鍵值位PS2鍵盤的字母u，對(duì)應(yīng)的鍵盤掃描碼為0x3c
      break;
      case 0xef:    //第五行有鍵按下
      temp=PS2_w ; flag=1;  //對(duì)應(yīng)鍵值位PS2鍵盤的字母w，對(duì)應(yīng)的鍵盤掃描碼為0x1d
      break;
   }
   break;

   case 0xfb:
   switch((temp2&0xff)) // 第三列有鍵按下
   {
      case 0xfe:    //第一行有鍵按下
      temp=23;  //該鍵無(wú)鍵盤號(hào)定義
               break;
      case 0xfd:    //第二行有鍵按下
      temp=PS2_4; flag=1; //對(duì)應(yīng)鍵值位PS2鍵盤的數(shù)字4，對(duì)應(yīng)的鍵盤掃描碼為0x25
      break;
      case 0xfb:    //第三行有鍵按下
      temp=PS2_9; flag=1; //對(duì)應(yīng)鍵值位PS2鍵盤的數(shù)字9，對(duì)應(yīng)的鍵盤掃描碼為0x46
      break;
      case 0xf7:    //第四行有鍵按下
      temp=PS2_i; flag=1; //對(duì)應(yīng)鍵值位PS2鍵盤的字母i，對(duì)應(yīng)的鍵盤掃描碼為0x43
      break;
      case 0xef:    //第五行有鍵按下
      temp=PS2_e; flag=1; //對(duì)應(yīng)鍵值位PS2鍵盤的字母e，對(duì)應(yīng)的鍵盤掃描碼為0x24
      break;
   }
   break;

   case 0xf7:
   switch((temp2&0xff))    // 第四列有鍵按下
   {
      case 0xfe:    //第一行有鍵按下
      temp=PS2_1; flag=1;  //對(duì)應(yīng)鍵值位PS2鍵盤的數(shù)字1，對(duì)應(yīng)的鍵盤掃描碼為0x16
               break;
      case 0xfd:    //第二行有鍵按下
      temp=PS2_3; flag=1;  //對(duì)應(yīng)鍵值位PS2鍵盤的數(shù)字3，對(duì)應(yīng)的鍵盤掃描碼為0x26
      break;
      case 0xfb:    //第三行有鍵按下
      temp=PS2_dec;flag=1;  //對(duì)應(yīng)鍵值位PS2鍵盤的減號(hào)，對(duì)應(yīng)的鍵盤掃描碼為0x4e
      break;
      case 0xf7:    //第四行有鍵按下
      temp=PS2_o; flag=1; //對(duì)應(yīng)鍵值位PS2鍵盤的字母o，對(duì)應(yīng)的鍵盤掃描碼為0x44
      break;
      case 0xef:    //第五行有鍵按下
      temp=PS2_r; flag=1; //對(duì)應(yīng)鍵值位PS2鍵盤的字母r，對(duì)應(yīng)的鍵盤掃描碼為0x2d
      break;
   }
   break;

   case 0xef:
   switch((temp2&0xff))    // 第五列有鍵按下
   {
      case 0xfe:       //第一行有鍵按下
      temp=PS2_0; flag=1; //對(duì)應(yīng)鍵值位PS2鍵盤的數(shù)字0，對(duì)應(yīng)的鍵盤掃描碼為0x45
               break;
      case 0xfd:       //第二行有鍵按下
      temp=PS2_2; flag=1;    //對(duì)應(yīng)鍵值位PS2鍵盤的數(shù)字2，對(duì)應(yīng)的鍵盤掃描碼為0x1e
      break;
      case 0xfb:    //第三行有鍵按下
      temp=PS2_eq;flag=1;    //對(duì)應(yīng)鍵值位PS2鍵盤的等號(hào)，對(duì)應(yīng)的鍵盤掃描碼為0x55
      break;
      case 0xf7:    //第四行有鍵按下
      temp=PS2_p;flag=1;    //對(duì)應(yīng)鍵值位PS2鍵盤的字母p，對(duì)應(yīng)的鍵盤掃描碼為0x4d
      break;
      case 0xef:       //第五行有鍵按下
      temp=PS2_t;flag=1; //對(duì)應(yīng)鍵值位PS2鍵盤的字母t，對(duì)應(yīng)的鍵盤掃描碼為0x2c
      break;
   }
   break;
   }
//P0=0XFF;       //每當(dāng)檢測(cè)完一行時(shí)清零行端口和列端口
//P2=0xff;
if((key=Key_Press())!=0);
delay(30);
}
  }
}
else  temp=23;    //無(wú)鍵按下返回?cái)?shù)字23，對(duì)應(yīng)數(shù)組內(nèi)的0；
if(flag==1)
  return temp;  //返回按鍵掃描值
else
   return 23;
}
void OnKeyBoardOnline(BOOL i)
{
KeyBoardFlag=i;
}
//---------------------------------------------------------------------------
void OnPS2ReceiveChar(BYTE ReceChar,BOOL P)
{
BOOL ParityBit=0;
ACC=ReceChar;
CY=P;
ParityBit=(BOOL)(CY?0x00:0x80);//奇校驗(yàn)位
if(P==ParityBit);
PS2RecChar=ReceChar;
}
//---------------------------------------------------------------------------
void OnPS2SendChar(BYTE dat)
{
BOOL ParityBit;
BYTE i;
ACC=dat;
CY=P;
ParityBit=(BOOL)(CY?0x00:0x80);//奇校驗(yàn)位

CLSSIGNAL();

CT_KB=OFF;
EX0=0;

H_DATA=0;Delay10us();//start bit
H_CLK=1;
Delay10us();
H_CLK=0;
Delay30us();

for(i=0;i<8;i++)
{
  if(dat&0x01==0x01){H_DATA=1;Delay10us();}
  else {H_DATA=0;Delay10us();}
  dat>>=1;
  H_CLK=1;
  Delay10us();
  H_CLK=0;
  Delay30us();
}

H_DATA=ParityBit;Delay10us();//parity bit
H_CLK=1;
Delay10us();
H_CLK=0;
Delay30us();

H_DATA=1;Delay10us();//stop bit
H_CLK=1;
Delay10us();
H_CLK=0;
Delay30us();

IE0=0;
EX0=1;
H_CLK=1;
H_DATA=1;
CT_KB=ON;
Delay30us();
}
//---------------------------------------------------------------------------
void ExternInterrupt0(void) interrupt 0
{
BOOL ParityBit=0,CLKFlag=1;
BYTE i=0,j=8,dat=0x00;

EX0=0;

while(CLKFlag)
{
  i++;
  if(H_CLK==1)CLKFlag=0;
  if(i>0xEE)
  {
IE0=0;
EX0=1;
return ;
  }
}
while(j--)//延時(shí)等待大鍵盤的動(dòng)作
{
  for(i=0;i<0x88;i++)//檢查是否有數(shù)據(jù)處理 0x88
  {
if(H_CLK==0)//有動(dòng)作則是大鍵盤存在
{
OnKeyBoardOnline(TRUE);//大鍵盤存在,開(kāi)機(jī)由大鍵盤應(yīng)答
IE0=0;
EX0=1;
return ;//存在的話置標(biāo)志位，并返回
}
  }
}
OnKeyBoardOnline(FALSE);//大鍵盤不存在，由小鍵盤應(yīng)答

//轉(zhuǎn)到接收
for(i=0;i<8;i++)//read 8bit
{
  Delay30us();
  H_CLK=0;
  Delay30us();
  H_CLK=1;
  dat=dat>>1;
  if(H_DATA)dat|=0x80;

  if(H_CLK==0){ return; }//如果時(shí)鐘被拉低，則有錯(cuò)誤發(fā)生
}

Delay30us();
H_CLK=0;
Delay30us();
H_CLK=1;
if(H_DATA)ParityBit=1;
else ParityBit=0;

Delay30us();
H_CLK=0;
Delay30us();
H_CLK=1;//STOP BIT H_DATA 0 ERR

Delay10us();
H_DATA=0; //ACK bit
Delay10us();
H_CLK=0;
Delay30us();Delay30us();
H_CLK=1;
Delay30us();
H_DATA=1;

OnPS2ReceiveChar(dat,ParityBit);

IE0=0;
EX0=1;
return ;
}
//---------------------------------------------------------------------------
void ProcessPS2(void)
{
if(KeyBoardFlag==FALSE)//大鍵盤不存在
{
  if(PS2RecChar==0xF3)//1
  {
OnPS2SendChar(0xFA);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0x00)//11
  {
OnPS2SendChar(0xFA);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0x02)//111
  {
OnPS2SendChar(0xFA);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0x20)//1111
  {
OnPS2SendChar(0xFA);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0xED)//2
  {
OnPS2SendChar(0xFA);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0xF0)//3
  {
OnPS2SendChar(0xFA);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0xF2)//4
  {
OnPS2SendChar(0xFA);
Delay30us();
OnPS2SendChar(0xAB);
Delay30us();
OnPS2SendChar(0x83);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0xEF)//5
  {
OnPS2SendChar(0xFA);
Delay30us();
OnPS2SendChar(0xBF);
Delay30us();
OnPS2SendChar(0xB0);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0xF3)//6
  {
OnPS2SendChar(0xFA);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0xFE)//7 //resend
  {
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0xEE)//8
  {
OnPS2SendChar(0xEE);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0xEE)//9
  {
OnPS2SendChar(0xEE);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0xF1)//10
  {
OnPS2SendChar(0xFA);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0xF4)//11
  {
OnPS2SendChar(0xFA);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0xAA)//12
  {
OnPS2SendChar(0xAA);
PS2RecChar=0xCC;
  }
  else if(PS2RecChar==0xFF)//13
  {
OnPS2SendChar(0xFA);
Delay30us();
OnPS2SendChar(0xAA);
Delay30us();
PS2RecChar=0xCC;
  }
  else ;
}
}
//---------------------------------------------------------------------------
void PS2Init(void)
{
IT0=0; //低電平觸發(fā)中斷
PX0=1;
EX0=1;
}
//---------------------------------------------------------------------------

extern void ProcessPS2(void);
extern void PS2Init(void);
void main(void)
{
unsigned char tem;
PS2Init();
ProcessPS2();
while(1)
{
  tem=Key_Scan();
  switch(tem&0xff)
  {
case 23 :
break;
default:
{
OnPS2SendChar(PS2Value[tem]);
}
break;
  }
  //開(kāi)機(jī)應(yīng)答,使電腦能識(shí)別到鍵盤
  //other code
}
}
仿真矩陣鍵盤電路圖，該電路未連接PS2,但可通過(guò)LED燈觀察每個(gè)按鍵按下之后的鍵值返回知否和第二套鍵盤碼對(duì)應(yīng)一致

第二套鍵值碼對(duì)應(yīng)表：

ID:135507 · 發(fā)表于 2016-7-30 09:02

這個(gè) PS2.h的頭文件去哪里找呀

ID:135566 · 發(fā)表于 2016-7-30 23:54

不錯(cuò)，挺好

ID:258695 · 發(fā)表于 2018-3-13 16:43

"這個(gè) PS2.h的頭文件去哪里找呀"
同問(wèn)。。

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51單片機(jī)模擬PS2協(xié)議制作5X5矩陣工業(yè)鍵盤

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