[推薦]單片機與PS2鍵盤接口程序單片機與PS2鍵盤接口程序

void int1proc() interrupt IE1_VECTOR using 1
{
unsigned ch* ar i, key;
code unsigned ch* ar PS2TAB[] = {//20鍵PS2小鍵盤鍵碼表
  0x70,//0
  0x69,//1
  0x72,//2
  0x7a,//3
  0x6b,//4
  0x73,//5
  0x74,//6
  0x6c,//7
  0x75,//8
  0x7d,//9
  0x05,//F1
  0x06,//F2
  0x04,//F3
  0x0c,//F4
  0x03,//F5
  0x0b,//F6
  0x5a,//Enter
  0x76,//Esc
  0x66,//Bksp
  0x71//KP.
  };
  if (PS2Buffers.PS2Keyco u* nt == 0){//PS2起始位測試
    if (!PS2CLOCK && !PS2DATA){//低電平是起始位
      if (PS2Buffers.PS2KeyExtFlage != 0xf0){
        PS2Buffers.PS2KeyTemp = 0;
        PS2Buffers.PS2KeyExtFlage = 0;
        PS2Buffers.PS2KeyPopError = 0;
      }
      PS2Buffers.PS2Keyco u* nt ++;//脈沖計數
    }
    else PS2Buffers.PS2KeyPopError = 0xeb;//置鍵起始位錯誤號0xeb
  }
  else if (PS2Buffers.PS2Keyco u* nt < 9){//PS2數據位
    key = PS2Buffers.PS2KeyTemp;//取鍵盤緩沖區(qū)移位數據
    key >>= 1;
    if (PS2DATA) key |= 0x80;
    PS2Buffers.PS2KeyTemp = key;
    PS2Buffers.PS2Keyco u* nt++;//脈沖計數
  }
  else if (PS2Buffers.PS2Keyco u* nt == 9){//PS2數據奇校驗
    ACC = PS2Buffers.PS2KeyTemp;//取鍵盤緩沖區(qū)移位數據(C51取偶校驗位)
    if (P != PS2DATA) PS2Buffers.PS2Keyco u* nt ++;//脈沖計數
    else{
      PS2Buffers.PS2KeyPopError = 0xec;////置鍵奇校驗位錯誤號0xec
      PS2Buffers.PS2Keyco u* nt = 0;//脈沖計數歸零
    }
  }
  else if (PS2Buffers.PS2Keyco u* nt == 10){//停止位
    key = PS2Buffers.PS2KeyTemp;//取鍵盤緩沖區(qū)移位數據
    PS2Buffers.PS2Keyco u* nt = 0;//脈沖計數歸零
    if (PS2DATA){//高電平是停止位
      if (key == 0xe0){//本次是擴展鍵
        PS2Buffers.PS2KeyExtFlage = 0xe0;//置擴展鍵標志(小鍵盤只有回車鍵)
      }
      else if (key == 0xf0){//本次是鍵斷碼，鍵釋放
        PS2Buffers.PS2KeyExtFlage = 0xf0;//置鍵釋放標志
      }
      else{//本次必為鍵值
        if ((key == 0xaa) || (key == 0xfa)) PS2Buffers.PS2KeyPushco u* nt = 0;//長
壓鍵計數器清零
        else{
            PS2CLOCK = 0;//阻止PS2鍵盤立即回送數據
          PS2Buffers.PS2KeyPopError = 0xaa;//出錯碼
          for (i = 0; i < 20; i++){
            if (key == (PS2TAB[i])){//搜索
              key = i + 1;
              if (PS2Buffers.PS2KeyExtFlage == 0xf0){
                key |= 0x80;//鍵釋放
                PS2Buffers.PS2KeyPushco u* nt = 0;//長壓鍵計數器清零
                PS2Buffers.PS2KeyMessage = key;//存入當前鍵值并執(zhí)行命令
              }
              else{
                if (key != PS2Buffers.PS2KeyVal){//換了一個鍵
                  PS2Buffers.PS2KeyPushco u* nt = 0;//長壓鍵計數器清零
                  PS2Buffers.PS2KeyMessage = key;//存入當前鍵值并執(zhí)行命令
                }
                else{//未換鍵
                  PS2Buffers.PS2KeyPushco u* nt ++;//長壓鍵計數器計數
                  if (PS2Buffers.PS2KeyPushco u* nt > DEFPS2PUSHco u* nt){//長壓時間到
                    PS2Buffers.PS2KeyMessage = key | 0x40;//存入當前鍵值并執(zhí)行命
令
                    PS2Buffers.PS2KeyPushco u* nt = 0;//長壓鍵計數器清零
                  }
                }
              }
              PS2Buffers.PS2KeyVal = key;//存入當前鍵值值1~20或0x80+(1~20)
              PS2Buffers.PS2KeyTemp = 0;//鍵碼移位記錄器
              PS2Buffers.PS2KeyExtFlage = 0;//擴展鍵標志
              PS2Buffers.PS2KeyPopError = 0;//鍵釋放標志或出錯碼
              break;
            }
          }
          if (PS2Buffers.PS2KeyPopError) PS2Buffers.PS2KeyPushco u* nt = 0;//長壓鍵
計數器清零
          PS2CLOCK = 1;//釋放PS2時鐘總線
        }
      }
    }
    else PS2Buffers.PS2KeyPopError = 0xed;//置停止位錯誤號0xed
  }
  else PS2Buffers.PS2Keyco u* nt = 0;//PS2鍵盤出錯
}
/*------------------------------------------------------------------
         利用函數指針數組運行PS2鍵盤散轉命令
-------------------------------------------------------------------*/
void PS2Commandex*e c(unsigned ch* ar key)
{
unsigned int i;
code void *funcpushbuffers[] = {//命令散轉表(匯編中的16個DW)
/*------------------------------------------------------------------
         15個壓鍵、放鍵及長壓鍵事件處理函數指針地址
-------------------------------------------------------------------*/
  (void *)ClrWdt            + 0x0000,
/*---------------------------------------------
           10個功能鍵壓鍵事件處理(獨立管理)
----------------------------------------------*/
  (void *)PS2F1KeyPush      + 0x5b7d,      //功能鍵F1壓鍵事件處理
  (void *)PS2F2KeyPush      + 0xa6ea,      //功能鍵F2壓鍵事件處理
  (void *)PS2F3KeyPush      + 0xf157,      //功能鍵F3壓鍵事件處理
  (void *)PS2F4KeyPush      + 0x4cc4,      //功能鍵F4壓鍵事件處理
  (void *)PS2F5KeyPush      + 0x9731,      //功能鍵F5壓鍵事件處理
  (void *)PS2F6KeyPush      + 0xe2ae,      //功能鍵F6壓鍵事件處理
  (void *)PS2EnterKeyPush   + 0x3d1b,      //功能鍵Enter壓鍵事件處理
  (void *)PS2EscKeyPush     + 0x8888,      //功能鍵Esc壓鍵事件處理
  (void *)PS2BkspKeyPush    + 0xd3f5,      //功能鍵Bksp壓鍵事件處理
  (void *)PS2KpKeyPush      + 0x2e62,      //功能鍵Kp壓鍵事件處理
/*---------------------------------------------
           2個放鍵事件處理(集中管理)
----------------------------------------------*/
  (void *)PS2NumberKeyPop   + 0x79df,      //數字鍵放鍵事件處理
  (void *)PS2FuncKeyPop     + 0xc44c,      //功能鍵放鍵事件處理
/*---------------------------------------------
           2個長壓鍵事件處理(集中管理)
----------------------------------------------*/
  (void *)PS2NumberKeyPushL + 0x1fb9,      //數字鍵長壓鍵事件處理
  (void *)PS2FuncKeyPushL   + 0x6a26,      //功能鍵長壓鍵事件處理
/*---------------------------------------------
           1個數字鍵壓鍵事件處理(集中管理)
----------------------------------------------*/
  (void *)PS2NumberKeyPush  + 0xb593       //數字鍵0~9壓鍵事件處理
  };
/*--------------------------------------------*/
  i = key;
  key &= 0x3f;//去掉鍵釋放及長壓鍵標志,取真鍵碼
  key --;
  if (key < 20){//只有20個鍵
    if (key < 10){//數字鍵0~9
      if (i <= 10) key = 15;//(散轉號0)壓數字鍵0~9
      else{
        if (i & 0x80) key = 11;//(散轉號11)放數字鍵0~9
        else key = 13;//(散轉號13)長壓數字鍵0~9
      }
    }
    else{//壓功能鍵F1~F6,Enter..KP
      if ((i & 0xc0) == 0) key -= 9;//(散轉號1~10)壓功能鍵F1~F6,Enter..KP
      else{
        if (i & 0x80) key = 12;//(散轉號12)放功能鍵
        else key = 14;//(散轉號14)長壓功能鍵
      }
    }
    ClrWdt();//喂狗(鬼知道鍵盤程序要運行多久,就替它先喂一次吧)
    i = ((key * 53 & 0xf) * 0x1000)+ ((key * 43 & 0xf) * 0x100) + ((key * 23 & 
0xf) * 0x10) + (key * 13 & 0xf);
    _icall_((void *)funcpushbuffers[key] - i);//取鍵盤散轉表并執(zhí)行鍵盤命令
  }