4X4矩阵键盘，数码管显示 -

标题: 4X4矩阵键盘，数码管显示 [打印本页]

作者: 花花的北北 时间: 2021-1-9 01:24
标题: 4X4矩阵键盘，数码管显示
用单片机C语言编程实现单个数码管显示按下按键编号（S1按下显示0，S2按下显示1…S16按下显示F）#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
unsigned char const
ceshi[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar keyscan(void);
void delay(uint i);
void main ()
{
  uchar key;
  P2=0x00;
  while(1)
  {
key=keyscan();
switch(key)
{
   case 0x7e:P0=ceshi[0];break;
   case 0x7d:P0=ceshi[1];break;
   case 0x7b:P0=ceshi[2];break;
   case 0x77:P0=ceshi[3];break;
   case 0xbe:P0=ceshi[4];break;
   case 0xbd:P0=ceshi[5];break;
   case 0xbb:P0=ceshi[6];break;
   case 0xb7:P0=ceshi[7];break;
   case 0xde:P0=ceshi[8];break;
   case 0xdd:P0=ceshi[9];break;
   case 0xdb:P0=ceshi[10];break;
   case 0xd7:P0=ceshi[11];break;
   case 0xee:P0=ceshi[12];break;
   case 0xed:P0=ceshi[13];break;
   case 0xeb:P0=ceshi[14];break;
   case 0xe7:P0=ceshi[15];break;
   }
   }
   }
   uchar keyscan(void)
   {
      uchar cord_h,cord_1;
P3=0x0f;
cord_h=P3&0x0f;
if(cord_h!=0x0f)
   {
      delay(100);
if(cord_h=P3&0x0f)
{
   cord_h=P3&0x0f;
   P3=cord_h|0xf0;
   cord_1=P3&0xf0;
   return(cord_h+cord_1);
   }
   }
   return(0xff);
   }
   void delay(uint i)
   {
   while(i--);
   }

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