基于51的PS2键盘按键检测C程序

#include <reg52.H> #include <intrins.H> #define uchar unsigned char #define uint unsigned int #define LCD_DATA P2 //数据口 sbit RS = P1^5; //并行的指令/数据选择信号, H数据, L命令 sbit RW = P1^7; //并行读写选择信号, H读, L写 sbit E = P1^6; //并行使能端, H有效, L无效 sbit PSB = P1^1; //并/串接口选择, H并,L串 sbit RET = P1^4; //复位, L有效 sbit DATA=P0^2; uchar count,ASCII=65,Data; uchar code datas1[] = {"PS2 键盘检测实验"}; uchar code datas2[] = {"检测的按键为"}; uchar code datas3[] = {"按键检测正确"}; uchar code datas4[] = {"检测有误 "}; void trains(uchar Code); uchar code unshifted[][2]= //shift键没按下译码表 { 0x0e,'`', 0x15,'q', 0x16,'1', 0x1a,'z', 0x1b,'s', 0x1c,'a', 0x1d,'w', 0x1e,'2', 0x21,'c', 0x22,'x', 0x23,'d', 0x24,'e', 0x25,'4', 0x26,'3', 0x29,' ', 0x2a,'v', 0x2b,'f', 0x2c,'t', 0x2d,'r', 0x2e,'5', 0x31,'n', 0x32,'b', 0x33,'h', 0x34,'g', 0x35,'y', 0x36,'6', 0x39,',', 0x3a,'m', 0x3b,'j', 0x3c,'u', 0x3d,'7', 0x3e,'8', 0x41,',', 0x42,'k', 0x43,'i', 0x44,'o', 0x45,'0', 0x46,'9', 0x49,'.', 0x4a,'/', 0x4b,'l', 0x4c,';', 0x4d,'p', 0x4e,'-', 0x52,'\'', 0x54,'[', 0x55,'=', 0x5b,']', 0x5d,'\\', 0x61,'<', 0x69,'1', 0x6b,'4', 0x6c,'7', 0x70,'0', 0x71,'.', 0x72,'2', 0x73,'5', 0x74,'6', 0x75,'8', 0x79,'+', 0x7a,'3', 0x7b,'-', 0x7c,'*', 0x7d,'9', 0,0 }; uchar code shifted[][2]= //shift键按下译码表 { 0x0e,'~', 0x15,'Q', 0x16,'!', 0x1a,'Z', 0x1b,'S', 0x1c,'A', 0x1d,'W', 0x1e,'@', 0x21,'C', 0x22,'X', 0x23,'D', 0x24,'E', 0x25,'$', 0x26,'#', 0x29,' ', 0x2a,'V', 0x2b,'F', 0x2c,'T', 0x2d,'R', 0x2e,'%', 0x31,'N', 0x32,'B', 0x33,'H', 0x34,'G', 0x35,'Y', 0x36,'^', 0x39,'L', 0x3a,'M', 0x3b,'J', 0x3c,'U', 0x3d,'&', 0x3e,'*', 0x41,'<', 0x42,'K', 0x43,'I', 0x44,'O', 0x45,')', 0x46,'(', 0x49,'>', 0x4a,'?', 0x4b,'L', 0x4c,':', 0x4d,'P', 0x4e,'_', 0x52,'"', 0x54,'{', 0x55,'+', 0x5b,'}', 0x5d,'|', 0x61,'>', 0x69,'1', 0x6b,'4', 0x6c,'7', 0x70,'0', 0x71,'.', 0x72,'2', 0x73,'5', 0x74,'6', 0x75,'8', 0x79,'+', 0x7a,'3', 0x7b,'-', 0x7c,'*', 0x7d,'9', 0,0 }; //延时约2us void delayUs() { _nop_();_nop_(); } //延时 a * 1ms void delayMs(uint a) { uint i, j; for(i = a; i > 0; i--) for(j = 100; j > 0; j--); } //检测LCD是否处于忙状态, 若忙返回1, 空闲返回0 bit checkBusy() { bit busy; RS = 0; RW = 1; E = 1; delayUs(); busy = (bit)(LCD_DATA&0x80); E = 0; return busy; } //等待LCD到空闲 void wait() { while(checkBusy()); } //写命令 void writeCmd(uchar cmd) { wait(); RS = 0; RW = 0; E = 0; delayUs(); LCD_DATA = cmd; delayUs(); E = 1; delayUs(); E = 0; } //写数据 void writeData(uchar dat) { wait(); RS = 1; RW = 0; E = 0; delayUs(); LCD_DATA = dat; delayUs(); E = 1; delayUs(); E = 0; } //初始化LCD void init() { PSB = 1; //并口方式 writeCmd(0x30); //基本指令, 扩充指令为34H delayMs(10); writeCmd(0x0c); //显示开, 关光标 writeCmd(0x01); //清屏 delayMs(10); } void init2() { PSB = 1; //并口方式 RET=0; //复位 delayUs(); //延时 RET=1; //复位置高 writeCmd(0x36); delayMs(10); writeCmd(0x3E); delayMs(10); writeCmd(0x01); //清屏 delayMs(10); } void setPosition(uchar x, uchar y) { uchar p; switch(x%4) { case 0: p = 0x80; break; //第一行开始地址 case 1: p = 0x90; break; //第二行 case 2: p = 0x88; break; //第三行 case 3: p = 0x98; break; //第四行 } p += y; writeCmd(p); } void writeString(uchar * str) { uchar i = 0; while(str[i] != '\0') { writeData(str[i++]); } } void DisplayGraphic(unsigned char code *adder) { int i,j; //*******显示上半屏内容设置 for(i=0;i<32;i++) // { writeCmd(0x80 + i); //SET 垂直地址 VERTICAL ADD writeCmd(0x80); //SET 水平地址 HORIZONTAL ADD for(j=0;j<16;j++) { writeData(*adder); adder++; } } //*******显示下半屏内容设置 for(i=0;i<32;i++) // { writeCmd(0x80 + i); //SET 垂直地址 VERTICAL ADD writeCmd(0x88); //SET 水平地址 HORIZONTAL ADD for(j=0;j<16;j++) { writeData(0xff); adder++; } } } void initkb() //键盘初始化函数 { EA=1;//� EX0=1; IT0=1; count=0; } void exter0() interrupt 0 { count++; if(count>=2 && count<=9) { Data=(Data>>1); if(DATA==1) Data|=0x80; } } void trains(uchar scancode) { static uchar up=0,shift=0; //up为通、断码标志，shift为shift键按下标志 uchar i; if (!up) //已接收的11位数据是通码（up为0） { switch (scancode)//开始翻译扫描码 { case 0xF0: //键盘释放标志（随后的一个字节是断码） up=1; //设置up为断码标志 break; case 0x12: //左shift键按下 shift=1; //设置shift为按下标志 break; case 0x59: //右shift键按下 shift=1; //设置shift为按下标志 break; default: if(!shift) //如果shift键没有按下 { //查找unshifted表，表中左列是扫描码，右列是对应的ASCII码 for(i=0;unshifted[i][0]!=scancode&&unshifted[i][0];i++); if(unshifted[i][0]==scancode) { ASCII=unshifted[i][1]; } } else //如果shift键按下 { //查找shifted表 for(i=0;shifted[i][0]!=scancode&&shifted[i][0];i++); if(shifted[i][0]==scancode) { ASCII=shifted[i][1]; } } break; } } else //已接收的11位数据是断码（up为1） { up = 0; //将断码标志复位 switch (scancode) //检测shift键释放 { case 0x12 : //左shift键 shift = 0; break; case 0x59 : //右shift键 shift = 0; break; default: break; } } } void main() { delayMs(500); init(); initkb(); setPosition(0, 0); writeString(datas1); setPosition(1, 0); writeString(datas2); while(1) { if(count==11) { count=0; trains(Data); } setPosition(2, 0); writeData(ASCII); if(count==0) { setPosition(3, 0); writeString(datas3); } else { setPosition(3, 0); writeString(datas4); count=0; } } }