51单片机程序设计：[1]51单片机读取PS2键盘

51单片机开发板

keil C开发工具

硬件连接关系：

#include #include 'scancodes.h'#define LCM_RW  P2_7 //定义LCD引脚#define LCM_RS  P3_5#define LCM_E   P3_4#define LCM_Data  P0#define Key_Data P2_0 //定义Keyboard引脚#define Key_CLK  P3_3#define Busy    0x80 //用于检测LCM状态字中的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.51hei.com  '};unsigned char code email[] =    {' hkccd@163.com '};unsigned char code Cls[] = {'                '};static unsigned char IntNum = 0; //中断次数计数static unsigned char KeyV; //键值static unsigned char DisNum = 0; //显示用指针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;P2_6=1;  //关闭数码管显示P0=0x00;P2_6=0; Delay400Ms(); //启动等待，等LCM讲入工作状态 LCMInit(); //LCM初始化 Delay5Ms(); //延时片刻(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; //设外部中断1为低电平触发 EA = 1; EX1 = 1; //开中断 do  {   if (BF)    Decode(KeyV);   else    EA = 1; //开中断  } 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; //若晶振速度太高可以在这后加小的延时 LCM_E = 0; //延时 LCM_E = 1;}//写指令void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测{ 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);}//读状态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); //三次显示模式设置，不检测忙信号 Delay5Ms();  WriteCommandLCM(0x38,0); Delay5Ms();  WriteCommandLCM(0x38,0); Delay5Ms(); WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号 WriteCommandLCM(0x08,1); //关闭显示 WriteCommandLCM(0x01,1); //显示清屏 WriteCommandLCM(0x06,1); // 显示光标移动设置 WriteCommandLCM(0x0F,1); // 显示开及光标设置}//按指定位置显示一个字符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; //当要显示第二行时地址码+0x40; X |= 0x80; //算出指令码 WriteCommandLCM(X, 1); //发命令字 WriteDataLCM(DData); //发数据}//按指定位置显示一串字符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) //若到达字串尾则退出  {   if (X <= 0xF) //X坐标应小于0xF    {     DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符     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); //等待PS/2CLK拉高 if (IntNum > 10)  {   IntNum = 0; //当中断11次后表示一帧数据收完，清变量准备下一次接收   BF = 1; //标识有字符输入完了   EA = 0; //关中断等显示完后再开中断 (注：如这里不用BF和关中断直接调Decode()则所Decode中所调用的所有函数要声明为再入函数)  }}void Decode(unsigned char ScanCode) //注意: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表示断码开始      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没按下       {        for (TempCyc = 0;(UnShifted[TempCyc][0]!=ScanCode)&&(TempCyc<59); TempCyc++); //查表显示        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++); //查表显示        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}

上面是主程序，下面来加个字符解码的头文件吧。 //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',};