key.c.new

单片机密码-24c01-12864-4x4按键扫描 初始密码是123456,按#确认 进入后,按*修改密码

#include<reg52.h>
//#include <absacc.h>
#include"key.h"
/*
char code tab[4][4]=
{
    {
        '7','8','9','A'
    }
    ,
    {
        '4','5','6','B'
    }
    ,
    {
        '1','2','3','C'
    }
    ,
    {
        '#','0','*','D'
    }
}
;       //0到F的16个键植
*/
///*
char code tab[4][4]=
{
    {
        '1','4','7','#'
    }
    ,
    {
        '2','5','8','0'
    }
    ,
    {
        '3','6','9','*'
    }
    ,
    {
        'A','B','C','D'
    }
}
;       //0到F的16个键植
//*/

///*
///*
void delay(unsigned char a)
{
    unsigned char i;
    while(a--)
    for(i=100;i>0;i--)
    ;
}
//*/

//*/


unsigned char kbscan()          //键盘扫描
{
    unsigned char hang,lie,key;
    if(P3!=0x0f)
    delay(5);
    if(P3!=0x0f)
    {
        switch(P3&0x0f)
        {
            case 0x0e:lie=0;break;
            case 0x0d:lie=1;break;
            case 0x0b:lie=2;break;
            case 0x07:lie=3;break;
        }
        P3=0xf0;
        P3=0xf0;
        switch(P3&0xf0)
        {
            case 0xe0:hang=0;break;
            case 0xd0:hang=1;break;
            case 0xb0:hang=2;break;
            case 0x70:hang=3;break;
        }
        P3=0x0f;
        while(P3!=0x0f);
        key=tab[hang][lie];
    }
    else
    //key=0;
    return (0);
    return (key);
    //return (0);
}