51单片机 4X4矩阵键盘代码分享
- #include <reg52.h>
- #define uchar unsigned char
- #define uint unsigned int
- sbit we = P2^7;
- sbit du = P2^6;
- uchar code 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, //熄灭
- 0x00 //自定义
-
- };
- void delay(uint z)
- {
- uint x,y;
- for(x = z; x > 0; x--)
- for(y = 114; y > 0 ; y--);
- }
- uchar KeyScan() //带返回值的子函数
- {
- uchar cord_l, cord_h;//声明列线和行线的值的储存变量
- P3 = 0xf0;//1111 0000
- if( (P3 & 0xf0) != 0xf0)//判断是否有按键按下
- {
- delay(5);//软件消抖
- if( (P3 & 0xf0) != 0xf0)//判断是否有按键按下
- {
- cord_l = P3 & 0xf0;// 储存列线值
- P3 = cord_l | 0x0f;
- cord_h = P3 & 0x0f;// 储存行线值
- while( (P3 & 0x0f) != 0x0f );//松手检测
- return (cord_l + cord_h);//返回键值码
- }
- }
-
- }
- void KeyPro()
- {
- switch( KeyScan() )
- {
- //第一行键值码
- case 0xee: P0 = leddata[0]; break;
- case 0xde: P0 = leddata[1]; break;
- case 0xbe: P0 = leddata[2]; break;
- case 0x7e: P0 = leddata[3]; break;
-
- //第二行键值码
- case 0xed: P0 = leddata[4]; break;
- case 0xdd: P0 = leddata[5]; break;
- case 0xbd: P0 = leddata[6]; break;
- case 0x7d: P0 = leddata[7]; break;
- //第三行键值码
- case 0xeb: P0 = leddata[8]; break;
- case 0xdb: P0 = leddata[9]; break;
- case 0xbb: P0 = leddata[10]; break;
- case 0x7b: P0 = leddata[11]; break;
- //第四行键值码
- case 0xe7: P0 = leddata[12]; break;
- case 0xd7: P0 = leddata[13]; break;
- case 0xb7: P0 = leddata[14]; break;
- case 0x77: P0 = leddata[15]; break;
- }
- }
- ……………………
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