4*6行列键盘的单片机驱动源程序 -

标题: 4*6行列键盘的单片机驱动源程序 [打印本页]

作者: iCekrY 时间: 2018-10-24 16:29
标题: 4*6行列键盘的单片机驱动源程序
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;
}

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