51单片机程序设计：[1]51单片机读取PS2键盘

1、硬件连接关系：

2、#include <reg51.h>#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[] = {" [email protected] "};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);elseEA = 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1if (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1while (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 SHIFTShift = 1;break;case 0x59 :// 右 SHIFTShift = 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 SHIFTShift = 0;break;case 0x59 :// 右 SHIFTShift = 0;break;}}BF = 0; //标识字符处理完了}

3、上面是主程序，下面来加个字符解码的头文件吧。//scancodes.hunsigned 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',};