简易加减法计算器单片机代码

Terran · 发表于 2022-6-29 10:20

EDA365欢迎您登录！

您需要登录才可以下载或查看，没有帐号？注册

x

参考了宋雪松老师的教学例程，源程序只能计算加法，本程序稍作修改后可进行加法和减法计算
#include <reg52.h>
#include <intrins.h>
#define  uchar unsigned char
#define uint unsigned int
uchar code table[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};          //共阴字形码
uchar code keycodemap[4][4]={
{ 0x31, 0x32, 0x33, 0x26 }, //数字键1、数字键2、数字键3、向上键
{ 0x34, 0x35, 0x36, 0x25 }, //数字键4、数字键5、数字键6、向左键
{ 0x37, 0x38, 0x39, 0x28 }, //数字键7、数字键8、数字键9、向下键
{ 0x30, 0x1B, 0x0D, 0x27 }}; //数字键0、ESC键、  回车键、向右键};
uchar keysta[4][4]={{1,1,1,1},{1,1,1,1},{1,1,1,1},{1,1,1,1}};          //全局变量记录四个键的状态 0按下 1弹起当keysta反正变化时说有按键动作 1变0 按下 0变1 弹起
uchar Ledbuf[6]={0X3F,0X00,0X00,0X00,0X00,0X00};                      //数码管显示缓冲区，第0位为最低位（个位），第5位为符号位
long result=0;
long adden=0;
sbit keyin0=P1^0;
sbit keyin1=P1^1;
sbit keyin2=P1^2;
sbit keyin3=P1^3;

sbit keyout0=P1^4;
sbit keyout1=P1^5;
sbit keyout2=P1^6;
sbit keyout3=P1^7;

void InitTimer1(void)       //定时1ms
{
TMOD = 0x10;
TH1 = 0xFC;
TL1 = 0x18;
EA = 1;
ET1 = 1;
TR1 = 1;
}

  void shownumber(long num)
  {
   static uchar buf[5]={0,0,0,0,0};
      char i;
      if(num<0)                //负数为补码取反加1得到原码
      { num=~num;
               num++;
               Ledbuf[5]=0x40;
      }
      else
      {
         Ledbuf[5]=0x00;
      }
      for(i=0;i<5;i++)
      {buf[ i]=num%10;
      num=num/10; }

         for (i=4; i>=1; i--)  //从最高位起，遇到0转换为空格，遇到非0则退出循环
{
      if (buf[ i] == 0)
         Ledbuf[ i] = 0x00;
      else
         break;
}

      for( ;i>=0;i--)
      {Ledbuf[ i]=table[buf[ i]];}

  }
  void keyaction(uchar keycode)
  {
   long temp;
      static uchar yunsuanfuhao=0;
   if((keycode>=0x30)&&(keycode<=0x39))                //按下数字键
      {
            temp=adden;
         adden=(adden<<3)+(adden<<1)+keycode-0x30;
            if(adden>99999) adden=temp;
               shownumber(adden);
      }

      else if(keycode==0x26) //加号键
      {
         yunsuanfuhao=1;
         result=result+adden;
            adden=0;
            shownumber(adden);
      }
      else if(keycode==0x25) //减号键
      {
         yunsuanfuhao=2;
         result=result+adden;
            adden=0;
            shownumber(adden);
      }
      else if(keycode==0x0d) // 等号键
      {
         if(yunsuanfuhao==1)          //加法
         {       result=result+adden;
                  adden=0;
         }
         else if(yunsuanfuhao==2) //减法
         {       result=result-adden;
                  adden=0;
         }

            shownumber(result);
      //       result=0;
      }

      else if (keycode==0x1b)                      //清零键
      {
         result=0;
         adden=0;
         shownumber(result);
      }

  }

  void keydriver()
  {
                  uchar i,j;       //i行 j列
               static uchar backup[4][4]={{1,1,1,1},{1,1,1,1},{1,1,1,1},{1,1,1,1}};
                  for(i=0;i<4;i++)
         {
            for(j=0;j<4;j++)
               {
                  if((backup[ i][j])!=(keysta[ i][j]))
                     {

                                 backup[ i][j]=keysta[ i][j]       ;
                              if(keysta[ i][j]==1)
                              {
                                 keyaction(keycodemap[ i][j]);
                              }
                     }
               }
         }
  }

void keyscan()
{
static uchar buf[4][4]={{0xff,0xff,0xff,0xff},{0xff,0xff,0xff,0xff},{0xff,0xff,0xff,0xff},{0xff,0xff,0xff,0xff}};
      static uchar hang=0;
      uchar i;
      buf[hang][0]=((buf[hang][0])<<1)|((uchar) keyin0);       //按行进行按键值的读取       读该行共4个键的键值进入buf[hang][0-3]
      buf[hang][1]=((buf[hang][1])<<1)|((uchar) keyin1);
      buf[hang][2]=((buf[hang][2])<<1)|((uchar) keyin2);
      buf[hang][3]=((buf[hang][3])<<1)|((uchar) keyin3);

      for(i=0;i<4;i++)                                                                                                 //判断该按键是否按下即keysta是否为0 经16ms后读取buf[hang][0-3]的低4位值观察是否为0X0F 或0X00
      {
      if       (((buf[hang][ i])&0x0f )== 0x0f) keysta[hang][ i]=1;
      else if       (((buf[hang][ i])&0x0f )== 0x00) keysta[hang][ i]=0;
      }

      hang++;
      if(hang>=4) hang=0;

      switch(hang)                      //按行扫描，选取第i行,该行线输出低电平
      {
      case 0:keyout3=1;keyout0=0;break; // P1=0B1110 1111;
      case 1:keyout0=1;keyout1=0;break; // P1=0b1101 1111;
      case 2:keyout1=1;keyout2=0;break;//P1=0b1011 1111;
      case 3:keyout2=1;keyout3=0;break;//P1=0b0111 1111;
      default: break;
      }


}
void ledscan()
{
   static uchar i=0;
      P2=~(0X01<<i);
      P0=Ledbuf[5-i];
      i++;
      if(i>=6) i=0;

}
  void main()
{
      InitTimer1();
      while(1)
      {
      keydriver();
      }
}
void timer1(void) interrupt 3
{
TH1 = 0xFC;
TL1 = 0x18;
keyscan();
ledscan();
}