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單片機(jī)與鍵盤接口程序（轉(zhuǎn)載自大蝦電子網(wǎng)）

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起始位測(cè)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.PS2KeyCount ++;//脈沖計(jì)數(shù)
    }
    else PS2Buffers.PS2KeyPopError = 0xeb;//置鍵起始位錯(cuò)誤號(hào)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(jì)數(shù)
  }
  else if (PS2Buffers.PS2KeyCount == 9){//PS2數(shù)據(jù)奇校驗(yàn)
    ACC = PS2Buffers.PS2KeyTemp;//取鍵盤緩沖區(qū)移位數(shù)據(jù)(C51取偶校驗(yàn)位)
    if (P != PS2DATA) PS2Buffers.PS2KeyCount ++;//脈沖計(jì)數(shù)
    else{
      PS2Buffers.PS2KeyPopError = 0xec;////置鍵奇校驗(yàn)位錯(cuò)誤號(hào)0xec
      PS2Buffers.PS2KeyCount = 0;//脈沖計(jì)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(jì)數(shù)歸零
    if (PS2DATA){//高電平是停止位
      if (key == 0xe0){//本次是擴(kuò)展鍵
        PS2Buffers.PS2KeyExtFlage = 0xe0;//置擴(kuò)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