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unsigned char KeyScan(void) //鍵盤掃描函數(shù)，使用行列逐級掃描法 { unsigned char Val; KeyPort=0xf0;//高四位置高，低四位拉低 if(KeyPort!=0xf0)//表示有按鍵按下 { DelayMs(10); //去抖 if(KeyPort!=0xf0) { //表示有按鍵按下 KeyPort=0xfe; //檢測第一行 if(KeyPort!=0xfe) { Val=KeyPort&0xf0; Val+=0x0e; while(KeyPort!=0xfe); DelayMs(10); //去抖 while(KeyPort!=0xfe); return Val; } KeyPort=0xfd; //檢測第二行 if(KeyPort!=0xfd) { Val=KeyPort&0xf0; Val+=0x0d; while(KeyPort!=0xfd); DelayMs(10); //去抖 while(KeyPort!=0xfd); return Val; } KeyPort=0xfb; //檢測第三行 if(KeyPort!=0xfb) { Val=KeyPort&0xf0; Val+=0x0b; while(KeyPort!=0xfb); DelayMs(10); //去抖 while(KeyPort!=0xfb); return Val; } KeyPort=0xf7; //檢測第四行 if(KeyPort!=0xf7) { Val=KeyPort&0xf0; Val+=0x07; while(KeyPort!=0xf7); DelayMs(10); //去抖 while(KeyPort!=0xf7); return Val; } } } return 0xff; } /*------------------------------------------------ 按鍵值處理函數(shù)，返回掃鍵值 ------------------------------------------------*/ unsigned char KeyPro(void) { switch(KeyScan()) { case 0x7e:return 0;break;//0 按下相應(yīng)的鍵顯示相對應(yīng)的碼值 case 0x7d:return 1;break;//1 case 0x7b:return 2;break;//2 case 0x77:return 3;break;//3 case 0xbe:return 4;break;//4 case 0xbd:return 5;break;//5 case 0xbb:return 6;break;//6 case 0xb7:return 7;break;//7 case 0xde:return 8;break;//8 case 0xdd:return 9;break;//9 case 0xdb:return 10;break;//a case 0xd7:return 11;break;//b case 0xee:return 12;break;//c case0xed:return 13;break;//d case 0xeb:return 14;break;//e case 0xe7:return 15;break;//f default:return 0xff;break; } }
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