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#include<reg52.h> #define uchar unsigned char #define uint unsigned int sbit we = P2^7; sbit duan = P2^6; uint i; uint num; unsigned char leddata[]={ 0x3F, //"0" 0x06, //"1" 0x5B, //"2" 0x4F, //"3" 0x66, //"4" 0x6D, //"5" 0x7D, //"6" 0x07, //"7" 0x7F, //"8" 0x6F, //"9" 0x77, //"A" 0x7C, //"B" 0x39, //"C" 0x5E, //"D" 0x79, //"E" 0x71, //"F" 0x76, //"H" 0x38, //"L" 0x37, //"n" 0x3E, //"u" 0x73, //"P" 0x5C, //"o" 0x40, //"-" 0x00, //熄滅 0x00 //自定義 };//十六進制代碼 void delay(uint z)//延時函數 { uint x,y; for(x = z;x > 0;x--) for(y = 114;y > 0;y--); } uchar KeyScan()//帶返回值的按鍵掃描子函數 { uchar cord_h,cord_l;//聲明列線和行線的值的儲存變量 P3 = 0xf0;//1111 0000 if((P3 & 0xf0) != 0xf0)//判斷是否有按鍵被按下 { delay(5);//軟件消抖 if((P3 & 0xf0) != 0xf0)//判斷是否有按鍵被按下 { i++;//按鍵次數加一 cord_l = P3 & 0xf0;//把列線值保存起來 P3 = cord_l | 0x0f;//將低四位全部賦1，同時高四位保持不變 cord_h = P3 & 0x0f;//把行線值保存起來 while((P3 & 0x0f) != 0x0f)//松手檢測 不等于 即為1 等于 為0 跳出while循環 return(cord_l + cord_h);//返回鍵值碼 } } } void KeyPro() { switch(KeyScan()) { case 0xee:num = leddata[1]; break; case 0xde:num = leddata[2]; break; case 0xbe:num = leddata[3]; break;//第一行鍵值碼 case 0xed:num = leddata[4]; break; case 0xdd:num = leddata[5]; break; case 0xbd:num = leddata[6]; break;//第二行鍵值碼 case 0xeb:num = leddata[7]; break; case 0xdb:num = leddata[8]; break; case 0xbb:num = leddata[9]; break;//第三行鍵值碼 case 0xd7:num = leddata[0]; break;//第四行鍵值碼 } } |
