STC单片机与PC键盘PS2的驱动程序

/******************************************/ /* 广州天河双龙电子公司 */ /* http://www.sl.com.cn */ /* PS2键盘驱动程序 */ /* 作者:ntzwq@wx88.net */ /* 2002年5月11日 */ /* 目标MCU:MEGA8 晶振:外部(EXT) 8MHZ */ /******************************************/ /******************************************/ /* 经过改动移植到51芯片上 */ /* 改动者:jifeng */ /******************************************/ #include <REG58.h> #include "config.h" //#include <REG61x2.H> #include "KeyBoard.h" #include "T6963.h" // #include "scancode.h" #define BUFF_SIZE 64 uint8 keycode; uint8 keyflag; unsigned char bitcount; uint8 xdata kb_buffer[BUFF_SIZE]; unsigned char input=0; unsigned char output=0; #define KEY_BUF_SIZE 32 uint8 KeyBuf[KEY_BUF_SIZE]; static uint8 KeyInCnt = 0; static uint8 KeyOutCnt = 0; unsigned char Key_OK=0; unsigned char Temp_Key; //使用软件模拟FIFO void KeyPushBuf(uint8 keyv) { keyflag = 1; KeyBuf[KeyInCnt] = keyv; if( KeyInCnt<(KEY_BUF_SIZE-1) ){ KeyInCnt++; } else{ KeyInCnt = 0; } } //从缓冲区读取键值 uint8 KeyPopBuf(void) { uint8 keyvalue; if( KeyInCnt==KeyOutCnt ){ keyvalue = 0; keyflag = 0; } else{ keyvalue = KeyBuf[KeyOutCnt]; if( KeyOutCnt<(KEY_BUF_SIZE-1) ){ KeyOutCnt++; } else{ KeyOutCnt = 0; } } return keyvalue; } //初始化 void init_kb(void) { IT1 = 1;//下降延触发 EX1 = 1; PX1 = 1; //IPH = 1;//设置为最高级优先级 EA=1; bitcount = 11; } //键值分析 void KeyDecode(uint8 ps2) { static uint8 shift; //这些要放在data里面,不然要出错 static uint8 shiftup; static uint8 alt; static uint8 altup; static uint8 up; uint8 i; //shift = 0; //alt = 0; if(ps2==0xf0){ up = 1; //断码开始 return; } if(up==1){ up=0; if((ps2==0x12)||(ps2==0x59)){ shift=0; //释放左右shift键标志 } if(ps2==0x11){ alt=0; //释放左alt键标志 } return; } switch(ps2){ case 0x11: alt=1; altup=1; break; case 0x12: //按键PRINT出现的特殊情况 if((Temp_Key==0xe0)||(Temp_Key==0xf0)){ KeyPushBuf(27); } else{ shift=1; shiftup=1; } break; case 0x59: shift=1; shiftup=1; break; default: if((shift==0)&&(alt==0)){ // Lcd_DisUint16(14,2,7777,4); for(i = 0;i<90; i++){ if (unshifted[i][0] == ps2){ if((Temp_Key==0xe0)&&(ps2==0x71)){ KeyPushBuf(15); Lcd_DisUint16(8,0,8888,4); //Delete } else{ KeyPushBuf(unshifted[i][1]); Lcd_DisUint16(14,2,unshifted[i][1],4); Lcd_DisUint16(18,2,KeyInCnt,4); Lcd_DisUint16(18,2,KeyOutCnt,4); //Lcd_Printf(1,2,"F1 KEY",0); Key_OK=1; } i=90; } } /* if (unshifted[i][0] == ps2){ if(((Temp_Key==0xe0)||(Temp_Key==0xf0))&&(ps2==0x7c)){ //PRINT键 } else{ if(((Temp_Key==0xe0)||(Temp_Key==0xf0))&&(ps2==0x71)){ KeyPushBuf(15); //Delete } else{ KeyPushBuf(unshifted[i][1]); Key_OK=1; } i=90; } } */ // } } //使用SHIFT+字母的方式,输入大写字母 else if((shift==1)&&(alt==0)){ Lcd_DisUint16(14,4,8888,4); for(i = 0;shifted[i][0]!=ps2 && shifted[i][0]; i++); if (shifted[i][0] == ps2){ KeyPushBuf(shifted[i][1]); Key_OK=1; } } //使用ALT+字母的方式,用于焦点的跳转 else if((shift==0)&&(alt==1)){ Lcd_DisUint16(14,6,9999,4); for(i = 0;alted[i][0]!=ps2 && alted[i][0]; i++); if (alted[i][0] == ps2){ KeyPushBuf(alted[i][1]); Key_OK=1; } } break; } } //键盘信息接收,使用中断 ,连接时钟线 void KeyIsr() interrupt 2 { static unsigned char dat; //Lcd_Printf(1,2,"F1 KEY",0); switch (bitcount) { case 11:{ //if ((PIN_KB&(1<<DATAPIN))!=0) if (PINDATA!=0) return; else bitcount--; break; } case 2:{ bitcount--; break; } case 1:{ bitcount--; //keyflag = 1; //if ((PIN_KB&(1<<DATAPIN))!=0) if (PINDATA==0) { bitcount=11; return; } else { bitcount=11; KeyDecode(dat); Temp_Key=dat; Lcd_DisUint16(1,0,dat,4); // keycode = KeyPopBuf(); // Lcd_DisUint16(8,0,keycode,4); } break; } default:{ dat = (dat >> 1); //if ((PIN_KB&(1<<DATAPIN))!=0) if (PINDATA!=0) dat|=0x80; bitcount--; } } } /* void put_esc(void) //模仿手动按下ESC键 { //put_kbbuff(ESC); KeyPushBuf(ESC); } void put_enter(void) //模仿手动按下ENTER键 { //put_kbbuff(ENTER); KeyPushBuf(ENTER); } */