普中科技51单片机矩阵按键检测

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1、电路

2、延时、显示、蜂鸣器程序

//*************didi函数****************void didi(uint di){  while(di--)  {    bz=0;delay(1);    bz=1;delay(1);    }  }//**************显示函数***************void display(uchar shu,uchar wei){  P2=(P2&0xe3)+(wei<<2);//显示位置  P0=tab[shu];//显示数据  delay(2);  P0=0x00;//消影}//**************延时函数**************void delay(uint ms){  uint i,j;  for(i=ms;i>0;i--)    for(j=123;j>0;j--);}

3、逐行检测程序

//司新生00//2024.3.25#include <REGX51.H>#define uchar unsigned char#define uint  unsigned intvoid delay(uint ms);void display(uchar shu,uchar wei);void didi(uint di);sbit bz=P1^5;//蜂鸣器uchar tab[]={0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07,       0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71,0x40};//显示0~9 A-F的值void main(){  uchar key,v;  while(1)  {    display(v/10%10,4);    display(v/1%10,3);    P1=0x7f;//0111 1111    if(P1!=0x7f)//第一行    {      delay(10);//消抖      if(P1!=0x7f)      {        key=P1;        while(P1!=0x7f)//松手检测        {}        didi(10);        switch(key)        {          case 0x77:v=1;break;          case 0x7b:v=2;break;          case 0x7d:v=3;break;          case 0x7e:v=4;break;          default:v=0;break;        }          }    }    P1=0xbf;//1011 1111 第二行    if(P1!=0xbf)    {      delay(10);//消抖      if(P1!=0xbf)      {        key=P1;        while(P1!=0xbf)        {}        didi(10);        switch(key)        {          case 0xb7:v=5;break;          case 0xbb:v=6;break;          case 0xbd:v=7;break;          case 0xbe:v=8;break;          default:v=0;break;        }      }    }    P1=0xdf;//1101 1111 第三行    if(P1!=0xdf)    {      delay(10);//消抖      if(P1!=0xdf)      {        key=P1;        while(P1!=0xdf)        {}        didi(10);        switch(key)        {          case 0xd7:v=9;break;          case 0xdb:v=10;break;          case 0xdd:v=11;break;          case 0xde:v=12;break;          default:v=0;break;        }      }    }    P1=0xef;//1110 1111 第四行    if(P1!=0xef)    {      delay(10);//消抖      if(P1!=0xef)      {        key=P1;        while(P1!=0xef)        {}        didi(10);        switch(key)        {          case 0xe7:v=13;break;          case 0xeb:v=14;break;          case 0xed:v=15;break;          case 0xee:v=16;break;          default:v=0;break;        }      }    }        }}//*************didi函数****************void didi(uint di){  while(di--)  {    bz=0;delay(1);    bz=1;delay(1);    }  }//**************显示函数***************void display(uchar shu,uchar wei){  P2=(P2&0xe3)+(wei<<2);//显示位置  P0=tab[shu];//显示数据  delay(2);  P0=0x00;//消影}//**************延时函数**************void delay(uint ms){  uint i,j;  for(i=ms;i>0;i--)    for(j=123;j>0;j--);}

4、正反检测程序

//司新生00//2024.3.26#include <REGX51.H>#define uchar unsigned char#define uint  unsigned intvoid delay(uint ms);void display(uchar shu,uchar wei);void didi(uint di);sbit bz=P1^5;//蜂鸣器uchar tab[]={0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07,       0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71,0x40};//显示0~9 A-F的值void main(){  uchar v,key;  while(1)  {    display(v/10%10,5);    display(v/1%10,4);    P1=0xf0;//确定哪一列有按键按下    if(P1!=0xf0)    {      delay(10);//消抖      if(P1!=0xf0)      {        key=P1;//0x70,0xb0,0xd0,0xe0        P1=0x0f;//反转 0x07,0x0b,0x0d,0x0e        key=key+P1;//行与列的值相加        while(P1!=0x0f)        {}        didi(10);        switch(key)        {          case 0x77:v=1;break;          case 0x7b:v=2;break;          case 0x7d:v=3;break;          case 0x7e:v=4;break;          case 0xb7:v=5;break;          case 0xbb:v=6;break;          case 0xbd:v=7;break;          case 0xbe:v=8;break;          case 0xd7:v=9;break;          case 0xdb:v=10;break;          case 0xdd:v=11;break;          case 0xde:v=12;break;          case 0xe7:v=13;break;          case 0xeb:v=14;break;          case 0xed:v=15;break;          case 0xee:v=16;break;          default:v=0;break;        }        }    }    }}//*************didi函数****************void didi(uint di){  while(di--)  {    bz=0;delay(1);    bz=1;delay(1);    }  }//**************显示函数***************void display(uchar shu,uchar wei){  P2=(P2&0xe3)+(wei<<2);//显示位置  P0=tab[shu];//显示数据  delay(2);  P0=0x00;//消影}//**************延时函数**************void delay(uint ms){  uint i,j;  for(i=ms;i>0;i--)    for(j=123;j>0;j--);}

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