簡易單片機矩陣鍵盤的實現(xiàn)

ID:783908 · 發(fā)表于 2020-7-19 17:27

proteus仿真：

keil代碼：
#include <reg51.h>
#define uint unsigned int
#define uchar unsigned char

uchar code table[]={//共陽數(shù)碼管段碼"0~f-."
            0xc0,0xf9,0xa4,0xb0,
            0x99,0x92,0x82,0xf8,
            0x80,0x90,0x88,0x83,
            0xc6,0xa1,0x86,0x8e,0xbf,0x7f};

uchar KeyValue=16;       //鍵值變量
bit sign=0;                               //位變量
uint count=0;                      //計數(shù)變量

void keyscan()                                     //按鍵掃描程序
{
      P1=0xf0;                                     //賦值P3 1111 0000
      if(P1!=0xf0)                               //檢測有按鍵按下
      {
            if((++count>=250)&&(sign==0))//消抖計數(shù)100~1000，按鍵自鎖
            {
                     sign=1;                      //按鍵自鎖標志置1
                     switch(P1)
                     {
                              case(0Xe0):KeyValue = 0;break;
                              case(0Xd0):KeyValue = 1;break;
                              case(0Xb0):KeyValue = 2;break;
                              case(0X70):KeyValue = 3;break;
                     }
                     P1=0x0f;                      //賦值P3 0000 1111
                     switch(P1)
                     {
                              case(0X0e):KeyValue+= 0;break;
                              case(0X0d):KeyValue+= 4;break;
                              case(0X0b):KeyValue+= 8;break;
                              case(0X07):KeyValue+=12;break;
                     }
            }
      }
      else                                              //鍵抬起
      {
            sign=0;                               //按鍵自鎖標志清0
            count=0;                               //消抖計數(shù)清0
      }
}

void main()                                              //主函數(shù)
{
      while(1)
      {
            keyscan();                               //按鍵掃描程序
            P3=table[KeyValue];       //數(shù)碼管顯示鍵值0~F
      }
}

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