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#include<reg52.h>
#include<stdlib.h>
#define uchar unsigned char
#define uint unsigned int
#define lcd P0
#define key P3
void write_com(uchar com);
void write_dat(uchar dat);
void delay(uchar z);
void Init_lcd();
void keyscan1();
void keyscan2();
void keyscan3();
void keyscan4();
void count_add();
void count_sub();
void count_mul();
void count_div();
void show_int();
void show_float();
sbit RS=P1^0;
sbit RW=P1^1;
sbit E=P2^5;
uchar temp,i=0,a=0,b=0,c=0,d=0,e=0,f=0,g=0;
long num,num1,num2,num3,value,value1;
uchar table[10];
uchar table2[10];
uchar table3[10];
uchar table4[10];
uchar code table1[]="0123456789";
void main()
{
Init_lcd();
while(1)
{
keyscan1();
keyscan2();
keyscan3();
keyscan4();
}
}
void keyscan1()
{
key=0xfe;
temp=key;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(10);
temp=key;
temp=temp&0xf0;
if(temp!=0xf0)
{
switch(temp)
{
case 0xe0:
if(f==0)
{
if(e==0)
table[i]='1';
if(e==1)
table2[i]='1';
}
if(f==1)
table3[i]='1';
if(f==2)
table4[i]='1';
write_dat('1');
break;
case 0xd0:
if(f==0)
{
if(e==0)
table[i]='2';
if(e==1)
table2[i]='2';
}
if(f==1)
table3[i]='2';
if(f==2)
table4[i]='2';
write_dat('2');
break;
case 0xb0:
if(f==0)
{
if(e==0)
table[i]='3';
if(e==1)
table2[i]='3';
}
if(f==1)
table3[i]='3';
if(f==2)
table4[i]='3';
write_dat('3');
break;
case 0x70:
if(f==0)
{
if(e==0)
table[i]='4';
if(e==1)
table2[i]='4';
}
if(f==1)
table3[i]='4';
if(f==2)
table4[i]='4';
write_dat('4');
break;
}
i++;
while(temp!=0xf0)
{
temp=key;
temp=temp&0xf0;
}
}
}
}
void keyscan2()
{
key=0xfd;
temp=key;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(10);
temp=key;
temp=temp&0xf0;
if(temp!=0xf0)
{
switch(temp)
{
case 0xe0:
if(f==0)
{
if(e==0)
table[i]='5';
if(e==1)
table2[i]='5';
}
if(f==1)
table3[i]='5';
if(f==2)
table4[i]='5';
write_dat('5');
break;
case 0xd0:
if(f==0)
{
if(e==0)
table[i]='6';
if(e==1)
table2[i]='6';
}
if(f==1)
table3[i]='6';
if(f==2)
table4[i]='6';
write_dat('6');
break;
case 0xb0:
if(f==0)
{
if(e==0)
table[i]='7';
if(e==1)
table2[i]='7';
}
if(f==1)
table3[i]='7';
if(f==2)
table4[i]='7';
write_dat('7');
break;
case 0x70:
if(f==0)
{
if(e==0)
table[i]='8';
if(e==1)
table2[i]='8';
}
if(f==1)
table3[i]='8';
if(f==2)
table4[i]='8';
write_dat('8');
break;
}
i++;
while(temp!=0xf0)
{
temp=key;
temp=temp&0xf0;
}
}
}
}
void keyscan3()
{
key=0xfb;
temp=key;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(10);
temp=key;
temp=temp&0xf0;
if(temp!=0xf0)
{
switch(temp)
{
case 0xe0:
if(f==0)
{
if(e==0)
table[i]='9';
if(e==1)
table2[i]='9';
}
if(f==1)
table3[i]='9';
if(f==2)
table4[i]='9';
i++;
write_dat('9');
break;
case 0xd0:
if(f==0)
{
if(e==0)
table[i]='0';
if(e==1)
table2[i]='0';
}
if(f==1)
table3[i]='0';
if(f==2)
table4[i]='0';
i++;
write_dat('0');
break;
case 0xb0:
f++;
g++;
if(g==2)
f++;
i=0;
write_dat('.');
break;
case 0x70:
write_dat('=');
num=atol(table);
num1=atol(table2);
num2=atol(table3);
num3=atol(table4);
if(a==1)
count_add();
if(b==1)
count_sub();
if(c==1)
count_mul();
if(d==1)
count_div();
break;
}
while(temp!=0xf0)
{
temp=key;
temp=temp&0xf0;
}
}
}
}
void keyscan4()
{
key=0xf7;
temp=key;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(10);
temp=key;
temp=temp&0xf0;
if(temp!=0xf0)
{
switch(temp)
{
case 0xe0:
write_dat('+');
a++;
break;
case 0xd0:
write_dat('-');
b++;
break;
case 0xb0:
write_dat('*');
c++;
break;
case 0x70:
write_dat('/');
d++;
break;
}
i=0;
f=0;
e++;
while(temp!=0xf0)
{
temp=key;
temp=temp&0xf0;
}
}
}
}
void Init_lcd()
{
write_com(0x38);
write_com(0x0e);
write_com(0x06);
write_com(0x01);
write_com(0x80);
}
void write_com(uchar com)
{
RS=0;
RW=0;
E=1;
lcd=com;
delay(10);
E=0;
}
void write_dat(uchar dat)
{
RS=1;
RW=0;
E=1;
lcd=dat;
delay(10);
E=0;
}
void delay(uchar z)
{
uchar x,y;
for(x=z;x>0;x--)
for(y=112;y>0;y--);
}
void count_add()
{
value=num+num1;
value1=num2+num3;
if(value1>=10)
{
value++;
value1=value1-10;
}
write_com(0x80+0x49);
show_int();
show_float();
while(1);
}
void count_sub()
{
value=num-num1;
value1=num2-num3;
if(value1<0)
{
value--;
value1=num2-num3+10;
}
write_com(0x80+0x49);
show_int();
show_float();
while(1);
}
void count_mul()
{
value=num*num1;
write_com(0x80+0x49);
show_int();
while(1);
}
void count_div()
{
value=num/num1;
write_com(0x80+0x49);
show_int();
while(1);
}
void show_int()
{
uchar one,two,three,four,five;
one=value/10000;
two=value%10000/1000;
three=value%10000%1000/100;
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