4×4矩阵键盘的按键在lcd上显示数字仿真及单片机代码

ID:207443 · 发表于 2017-11-5 20:53

lcd1602显示矩阵键盘的按键值的仿真原理图（proteus工程文件可到本帖附件中下载）

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4×4矩阵键盘的按键在lcd上显示数字.rar (91.96 KB, 下载次数: 288)

单片机代码：

#include <reg51.h>
#include <intrins.h>                      //包含_nop_( )空函数指令的头文件
#define uchar unsigned char
#define uint unsigned int
#define out P0
sbit RS=P2^0;                                        //位变量
sbit RW=P2^1;                                     //位变量
sbit E=P2^2;
void lcd_initial(void);                                              //位变量void lcd _initial(void);                                     //LCD初始化函数
void check_busy(void);                               //检查忙标志函数
void write_command(uchar com);                      //写命令函数
void write_data(uchar dat);                      //写数据函数
void string(uchar ad ,uchar *s);
void delay(uint);                               //延时函数
unsigned char key_scan()
{
      unsigned char key_temp0,key_temp1;
      unsigned char key_num=0;
      P1=0x0f;
      key_temp0=P1;
      if(key_temp0!=0x0f)
      {
            delay(5);
            key_temp0=P1;
            if(key_temp0!=0x0f)
            {
                     P1=0xf0;
                     key_temp1=P1;
                     if(key_temp0==0x0e)
                     {
                              switch(key_temp1)
                              {
                                    case 0xe0: key_num=4;break;
                                    case 0xd0: key_num=3;break;
                                    case 0xb0: key_num=2;break;
                                    case 0x70: key_num=1;break;
                                    default:key_num=0;break;
                              }
                     }
                     else if(key_temp0==0x0d)
                     {
                              switch(key_temp1)
                              {
                                    case 0xe0: key_num=8;break;
                                    case 0xd0: key_num=7;break;
                                    case 0xb0: key_num=6;break;
                                    case 0x70: key_num=5;break;
                                    default:key_num=0;break;
                              }
                     }
                     else if(key_temp0==0x0b)
                     {
                              switch(key_temp1)
                              {
                                    case 0xe0: key_num=12;break;
                                    case 0xd0: key_num=11;break;
                                    case 0xb0: key_num=10;break;
                                    case 0x70: key_num=9;break;
                                    default:key_num=0;break;
                              }
                     }
                     else if(key_temp0==0x07)
                     {
                              switch(key_temp1)
                              {
                                    case 0xe0: key_num=16;break;
                                    case 0xd0: key_num=15;break;
                                    case 0xb0: key_num=14;break;
                                    case 0x70: key_num=13;break;
                                    default:key_num=0;break;
                              }
                     }
            }
      }
return key_num;
}

void main(void)                      //主函数
{
      unsigned char key_num;
      lcd_initial( );                      //调用对LCD初始化函数
do
{
                     key_num=key_scan();
                     string(0x82,"Yu Wang wang");             //显示的第1行字符串
               switch(key_num)
                     {
                              case 1 :string(0xC8,"1");  break;
                              case 2 :string(0xC8,"2");  break;
                              case 3 :string(0xC8,"3");  break;
                              case 4 :string(0xC8,"4");  break;
                              case 5 :string(0xC8,"5");  break;
                              case 6 :string(0xC8,"6");  break;
                              case 7 :string(0xC8,"7");  break;
                              case 8 :string(0xC8,"8");  break;
                              case 9 :string(0xC8,"9");  break;
                              case 10:string(0xC8,"10"); break;
                              case 11:string(0xC8,"11"); break;
                              case 12:string(0xC8,"12"); break;
                              case 13:string(0xC8,"13"); break;
                              case 14:string(0xC8,"14"); break;
                              case 15:string(0xC8,"15"); break;
                              case 16:string(0xC8,"16"); break;
                     }
                     delay(100);                      //延时
                     write_command(0x01);             //写入清屏命令
                     delay(1);                      //延时
      }while(1);
}
void delay(uint j)                      //1ms延时子程序
{
      uchar i=250;
      for(;j>0;j--)
{
            while(--i);
            i=249;
            while(--i);
            i=250;
      }
}
void check_busy(void)                      //检查忙标志函数
{
      uchar dt;
      do
      {
            dt=0xff;
            E=0;
            RS=0;
            RW=1;
E=1;
dt=out;
}while(dt&0x80);
E=0;
}
void write_command(uchar com)                //写命令函数
{
check_busy();
E=0;
RS=0;
RW=0;
out=com;
E=1;
_nop_( );
E=0;
delay(1);
}
void write_data(uchar dat)                               //写数据函数
{
      check_busy();
      E=0;
      RS=1;
      RW=0;
      out=dat;
      E=1;
      _nop_();
      E=0;
      delay(1);
}
void LCD_initial(void)                      //液晶显示器初始化函数
{
write_command(0x38);       //写入命令0x38：8位两行显示，5×7点阵字符
write_command(0x0C);       //写入命令0x0C：开整体显示，光标关，无黑块
write_command(0x06);       //写入命令0x06：光标右移

write_command(0x01);                      //写入命令0x01：清屏
delay(1);
}
void string(uchar ad,uchar *s)       //输出显示字符串的函数
{
write_command(ad);
while(*s>0)
{
write_data(*s++);                      //输出字符串，且指针增1
delay(50);
}
}