#include  

#include

#include "key.h"

#include "1602.h"

#include "delay.h"

unsigned char display[3]={0,0,0};//显示数据

void main(void)

{  unsigned char Key;

   LCD_init(); 

   delay_nms(50);

  while(1)

   {

     Key = keyboard_Scan();            // 键盘扫描 

display[1]=Key/100%10+0x30;

     display[2]=Key/10%10+0x30;

     display[3]=Key%10+0x30;

LCD_write_char(5,0,display[1]); 

LCD_write_char(6,0,display[2]);  

     LCD_write_char(7,0,display[3]); 

delay_nms(50);

     //switch(Key)

     // {

      //  case 0:

       // break;

      // default:

      // break;

     //}

   }

}

//key.h

#ifndef _4X4_H_

#define _4X4_H_

#define No_key  255

#define key_port      PORTB 

#define key_port_ddr  DDRB 

#define key_port_pin  PINB

unsigned char keyboard_Scan(void);

#endif

//key.c

#include  

#include

#include "key.h"

const unsigned char key_table[16] =  

      { 

         1, 2, 3,12, 

         4, 5, 6,13, 

         7, 8, 9,14,                

         10,0,11,15, 

     };

//4x4矩阵键盘扫描函数

unsigned char keyboard_Scan(void) 

{ 

    unsigned char temp,key,row,Column;                         

    key_port_ddr  = 0b00001111;// 高四位输入行线/低四位输出列线 

    key_port        = 0b11110000;// 高四位打开上拉电阻/低四位输出低电平 

    delay_nus(5);// 延时5us 

    if((key_port_pin & 0xF0)!= 0xF0) // 作初检查有否键按下,没有,就返回 

   {                                                            // 如果行线不全为1,可能有键按下 

     delay_nms(5);// 延时去抖动 

      //设置列线初始值3~0=1110        

     for(Column=0,key_port=0b11111110;Column<4;Column++) 

     {                 

         for(row=0,temp=0b11101111;row<4;row++)// 设置行线初始值7~4=1110 

       {   

           while((key_port_pin & 0xF0)==(temp & 0xF0))// 输入行线,查看这行有否键按下 

           { 

           key=4*row+Column;// 键编码=4*行输入值+列扫描值 

           key=key_table[key];// 键盘编码转换键值 

            return (key); 

            } 

          temp<<=1;// 行线左移1位 

        } 

      key_port=((key_port<<1)|0x01);// 列线扫描值左移1位,扫描下一行 

     } 

   } 

   return (No_key); 

}