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          單片機鍵盤C程序

          作者: 時間:2012-12-11 來源:網(wǎng)絡(luò) 收藏

          void int1proc() interrupt IE1_VECTOR using 1
          {
          unsigned char i, key;
          code unsigned char 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.PS2KeyCount == 0){//PS2測試
          if (!PS2CLOCK !PS2DATA){//低電平是
          if (PS2Buffers.PS2KeyExtFlage != 0xf0){
          PS2Buffers.PS2KeyTemp = 0;
          PS2Buffers.PS2KeyExtFlage = 0;
          PS2Buffers.PS2KeyPopError = 0;
          }
          PS2Buffers.PS2KeyCount ++;//脈沖計數(shù)
          }
          else PS2Buffers.PS2KeyPopError = 0xeb;//置鍵錯誤號0xeb
          }
          else if (PS2Buffers.PS2KeyCount 9){//PS2數(shù)據(jù)位
          key = PS2Buffers.PS2KeyTemp;//取鍵盤緩沖區(qū)移位數(shù)據(jù)
          key >>= 1;
          if (PS2DATA) key = 0x80;
          PS2Buffers.PS2KeyTemp = key;
          PS2Buffers.PS2KeyCount++;//脈沖計數(shù)
          }
          else if (PS2Buffers.PS2KeyCount == 9){//PS2數(shù)據(jù)奇校驗
          ACC = PS2Buffers.PS2KeyTemp;//取鍵盤緩沖區(qū)移位數(shù)據(jù)(C51取偶校驗位)
          if (P != PS2DATA) PS2Buffers.PS2KeyCount ++;//脈沖計數(shù)
          else{
          PS2Buffers.PS2KeyPopError = 0xec;////置鍵奇校驗位錯誤號0xec
          PS2Buffers.PS2KeyCount = 0;//脈沖計數(shù)歸零
          }
          }
          else if (PS2Buffers.PS2KeyCount == 10){//停止位
          key = PS2Buffers.PS2KeyTemp;//取鍵盤緩沖區(qū)移位數(shù)據(jù)
          PS2Buffers.PS2KeyCount = 0;//脈沖計數(shù)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(biāo)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(biāo)志
          }
          else{//本次必為鍵值
          if ((key == 0xaa) (key == 0xfa)) PS2Buffers.PS2KeyPushCount = 0;//長
          壓鍵計數(shù)器清零
          else{
          PS2CLOCK = 0;//阻止PS2鍵盤立即回送數(shù)據(jù)
          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.PS2KeyPushCount = 0;//長壓鍵計數(shù)器清零
          PS2Buffers.PS2KeyMessage = key;//存入當(dāng)前鍵值并執(zhí)行命令
          }
          else{
          if (key != PS2Buffers.PS2KeyVal){//換了一個鍵
          PS2Buffers.PS2KeyPushCount = 0;//長壓鍵計數(shù)器清零
          PS2Buffers.PS2KeyMessage = key;//存入當(dāng)前鍵值并執(zhí)行命令
          }
          else{//未換鍵
          PS2Buffers.PS2KeyPushCount ++;//長壓鍵計數(shù)器計數(shù)
          if (PS2Buffers.PS2KeyPushCount > DEFPS2PUSHCOUNT){//長壓時間到
          PS2Buffers.PS2KeyMessage = key 0x40;//存入當(dāng)前鍵值并執(zhí)行命

          PS2Buffers.PS2KeyPushCount = 0;//長壓鍵計數(shù)器清零
          }
          }
          }
          PS2Buffers.PS2KeyVal = key;//存入當(dāng)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(biāo)志
          PS2Buffers.PS2KeyPopError = 0;//鍵釋放標(biāo)志或出錯碼
          break;
          }
          }
          if (PS2Buffers.PS2KeyPopError) PS2Buffers.PS2KeyPushCount = 0;//長壓鍵
          計數(shù)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.PS2KeyCount = 0;//PS2鍵盤出錯
          }


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