| 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 |