用LCD1602显示输出8位可连续进行简单的加减乘除运算，包含单片机代码 -

标题: 用LCD1602显示输出8位可连续进行简单的加减乘除运算，包含单片机代码 [打印本页]

作者: becase 时间: 2019-1-7 14:20
标题: 用LCD1602显示输出8位可连续进行简单的加减乘除运算，包含单片机代码
仿真原理图如下（proteus仿真工程文件可到本帖附件中下载）

/*************
功能：用LCD1602显示输出8位可连续进行简单的加减乘除运算

说明：无论与0相乘还是相除输出结果是随机的，错误的；
   除法输出是带小数点的8位数字显示输出，还没有继续小数点转换
*************/
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit rs=P2^2;
sbit rw=P2^1;
sbit e=P2^0;
void write_dat(uchar dat);
void write_com(uchar com);
void process(void);
void keyscan();

/*按键功能*/
uchar code table1[]=
{
1,2,3,0x2b-0x30,                // 1, 2, 3, +
4,5,6,0x2d-0x30,                // 4, 5, 6, -
7,8,9,0x2a-0x30,                // 7, 8, 9, x
0,0x3d-0x30,0x01-0x30,0x2f-0x30    // 0, =, 清零, /
};

uchar k=0,flag=0,num,fuhao[6],i,temp1=0,flag1=0;

long a,b,c,d;

void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
      for(y=110;y>0;y--);
}
/********按键处理***********/
void keyscan()
{
uchar temp;
P3=0xfe;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
   delay(5);
   temp=P3;
   temp=temp&0xf0;
   while(temp!=0xf0)
   {
         temp=P3;
         switch(temp)
         {
            case 0xee:num=0;
            break;
            case 0xde:num=1;
            break;
            case 0xbe:num=2;
            break;
            case 0x7e:num=3;
            break;
         }
         while(temp!=0xf0)       // 松手检测
            { temp=P3;
               temp=temp&0xf0;
               }
         }
   if(num==0||num==1||num==2)
   {

         if(flag==0)
            a=a*10+table1[num]; //如果没有按符号键,符号前的数值为a
         else if(flag==1)
            b=b*10+table1[num];  //如果按了符号键,符号后的数值为b

         else if(temp1>=2&&flag1==1)
         {
         flag=1;
         flag1=0;
         process();

         a=c;
         b=table1[num];
            }

         if(k==1)
            {
            k=0;
            write_com(0x01);
            }
      }
      else if(num==3)
      {
         flag++;
         flag1=1;
         temp1++;
         fuhao[temp1-1]=1;

      }

   i=table1[num]; //显示按下的键
   write_dat(0x30+i);

}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
   delay(5);
   temp=P3;
   temp=temp&0xf0;
   while(temp!=0xf0)
   {
         temp=P3;
         switch(temp)
         {
            case 0xed:num=4;
            break;
            case 0xdd:num=5;
            break;
            case 0xbd:num=6;
            break;
            case 0x7d:num=7;
            break;
         }
         while(temp!=0xf0)
            { temp=P3;
               temp=temp&0xf0;
               }
         }
      if(num==4||num==5||num==6)
      {
               if(k==1)
               {
                  k=0;
                  write_com(0x01);
               }
         if(flag==0)
            a=a*10+table1[num];
         else if(flag==1)
            b=b*10+table1[num];
         else if(temp1>=2&&flag1==1)
            {
               flag=1;
               flag1=0;
               process();

                  a=c;
               b=table1[num];
               }
      }
      else if(num==7)
      {
         flag++;
         temp1++;
         flag1=1;
         fuhao[temp1-1]=2;


      }
      i=table1[num];
      write_dat(0x30+i);

   }
P3=0xfb;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
   delay(5);
   temp=P3;
   temp=temp&0xf0;
   while(temp!=0xf0)
   {
         temp=P3;
         switch(temp)
         {
            case 0xeb:num=8;
            break;
            case 0xdb:num=9;
            break;
            case 0xbb:num=10;
            break;
            case 0x7b:num=11;
            break;
         }
         while(temp!=0xf0)
            { temp=P3;
               temp=temp&0xf0;
               }
         }
         if(num==8||num==9||num==10)
         {
            if(k==1)
               {
                  k=0;
                  write_com(0x01);
               }
            if(flag==0)
               a=a*10+table1[num];
            else if(flag==1)
               b=b*10+table1[num];
            else if(temp1>=2&&flag1==1)
            {
               flag=1;
               flag1=0;
               process();

                  a=c;
               b=table1[num];
               }

         }
         else if(num==11)
         {
            flag++;
            temp1++;
            flag1=1;
            fuhao[temp1-1]=3;


         }
         i=table1[num];
         write_dat(0x30+i);

   }
   P3=0xf7;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
   delay(5);
   temp=P3;
   temp=temp&0xf0;
   while(temp!=0xf0)
   {
         temp=P3;
         switch(temp)
         {
            case 0xe7:num=12; // 0键
            break;
            case 0xd7:num=13;    // '='
            break;
            case 0xb7:num=14;    //清零键
            break;
            case 0x77:num=15;       //除号键
            break;
         }
         while(temp!=0xf0)
            { temp=P3;
               temp=temp&0xf0;
               }
         }
      switch(num)
      {
         case 12:
            {
               if(k==1)
               {
                  k=0;
                  write_com(0x01);
               }
               if(flag==0)
               a=a*10;
               else if(flag==1)
               b=b*10;
               else if(temp1>=2&&flag1==1)
            {
               flag=1;
               flag1=0;
               process();

                  a=c;
               b=table1[num];
               }

               write_dat(0x30);
               }
               break;
         case 13:
            {
               k=1;
               if(temp1>=2)
                  fuhao[0]=fuhao[temp1-1];
               if(fuhao[0]==1)
               {

                  write_com(0x80+0x4f);
                  write_com(0x04);
                  c=a+b;
                  d=c;
                  while(c!=0)
                  {
                     write_dat(0x30+c%10);
                     c=c/10;
                  }
                  write_dat(0x3d);
                  fuhao[0]=0;fuhao[1]=0;fuhao[2]=0;
                  fuhao[3]=0;fuhao[4]=0;fuhao[5]=0;
                  a=0;b=0;flag=0;flag1=0;temp1=0;
               }
               if(fuhao[0]==2)
               {
                  write_com(0x80+0x4f);
                  write_com(0x04);
                  if(a>=b)
                  {
                  c=a-b;
                  d=c;
                  while(c!=0)
                  {
                     write_dat(0x30+c%10);
                     c=c/10;
                  }

                  }
                  else if(a<b)
                  {
                     c=b-a;
                     d=c;
                     while(c!=0)
                     {
                        write_dat(0x30+c%10);
                        c=c/10;
                     }
                  write_dat(0x2d);
                  }

                  write_dat(0x3d);
                  fuhao[0]=0;fuhao[1]=0;fuhao[2]=0;
                  fuhao[3]=0;fuhao[4]=0;fuhao[5]=0;
                  a=0;b=0;flag=0;flag1=0;temp1=0;

               }
               if(fuhao[0]==3)
               {
                  write_com(0x80+0x4f);
                  write_com(0x04);
                  c=a*b;
                  d=c;
                  while(c!=0)
                  {
                     write_dat(0x30+c%10);
                     c=c/10;
                  }
                  write_dat(0x3d);
                  fuhao[0]=0;fuhao[1]=0;fuhao[2]=0;
                  fuhao[3]=0;fuhao[4]=0;fuhao[5]=0;
                  a=0;b=0;flag=0;flag1=0;temp1=0;

               }
               if(fuhao[0]==4)
               {
                  i=0;
                  write_com(0x80+0x4f);
                  write_com(0x04);
                  c=(long)(((float)a/b)*1000000);
                  d=c;
                  while(c!=0)
                  {
                     write_dat(0x30+c%10);
                     c=c/10;
                     i++;

                     if(i==6)
                     write_dat(0x2e);
                  }
                  if(a/b<=0)
                  write_dat(0x30);
                  write_dat(0x3d);
                  fuhao[0]=0;fuhao[1]=0;fuhao[2]=0;
                  fuhao[3]=0;fuhao[4]=0;fuhao[5]=0;
                  a=0;b=0;flag=0;flag1=0;temp1=0;
               }
               }
            break;

         case 14:
            { write_com(0x01);
               a=0;b=0;flag=0;temp1=0;flag1=0;
               fuhao[0]=0;fuhao[1]=0;fuhao[2]=0;
               fuhao[3]=0;fuhao[4]=0;fuhao[5]=0;
               }
               break;

         case 15:
               {
                  flag++;
                  temp1++;
                  flag1=1;
                  fuhao[temp1-1]=4;
                  write_dat(0x30+table1[num]);
               }
               break;
      }
   }
}
/*******led1602显示*******/
void write_com(uchar com)
{
rs=0;
rw=0;
P0=com;
e=1;
delay(5);
e=0;
}
void write_dat(uchar dat)
{
rs=1;
rw=0;
P0=dat;
e=1;
delay(5);
e=0;
}

void process(void)
{

      if(fuhao[temp1-2]==1) //如果符号键是+，执行加法运算
      {
         c=a+b;
         b=0;
      }                      // 如果符号键是-，执行减法运算
      if(fuhao[temp1-2]==2)
      {
         c=a-b;
         b=0;
      }
      if(fuhao[temp1-2]==3) //如果符号键是*执行乘法运算
      {
         c=a*b;
         b=0;
      }
      if(fuhao[temp1-2]==4)    //如果符号键是/ 执行除法运算
      {
         c=(long)((float)a/b);
         b=0;
         }
}

/*液晶的初始化*/
void init()  //初始化
{
delay(15);
write_com(0x38);
delay(6);
write_com(0x38);
delay(6);
write_com(0x38);
write_com(0x38);
write_com(0x0c);  //开显示，关光标
write_com(0x06);  //光标移动
write_com(0x01);  //清屏
}

void main()
{
init();
while(1)
{
   keyscan();
}
}

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