引脚参照图片
单片机源程序如下：
#include <STC89.H>
#include "Keypad.h"
// 键值 键释放时间 键按下时间
char KeyNum;
unsigned int KeyUpCnt,KeyDownCnt;
char KeyScan()
{
P1 |= 0xFC;
P2 = (P2&0xF0) | (0x0E);
if(!P17)return 0x11;//ON/C
if(!P16)return '7'; //7
if(!P15)return '8'; //8
if(!P14)return '9'; //9
if(!P13)return '*'; //x
if(!P12)return '/'; //÷
P1 |= 0xFC;
P2 = (P2&0xF0) | (0x0D);
if(!P17)return 0x12;//+/-
if(!P16)return '4'; //4
if(!P15)return '5'; //5
if(!P14)return '6'; //6
if(!P13)return '-'; //-
if(!P12)return 0x13;//MRC
P1 |= 0xFC;
P2 = (P2&0xF0) | (0x0B);
if(!P17)return '%'; //%
if(!P16)return '1'; //1
if(!P15)return '2'; //2
if(!P14)return '3'; //3
if(!P13)return '+'; //+
if(!P12)return 0x14;//M-
P1 |= 0xFC;
P2 = (P2&0xF0) | (0x07);
if(!P17)return '?'; //?
if(!P16)return '0'; //0
if(!P15)return '.'; //.
if(!P14)return '='; //=
if(!P13)return '+'; //+
if(!P12)return 0x15;//M+
P2 = (P2&0xF0) | (0x0F);
return -1;
}
全部资料51hei下载地址：
4x6行列键盘驱动.rar
(3.43 KB, 下载次数: 13)
|
