#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit e=P2^3;
sbit rs=P2^4;
sbit rw=P2^0;
sbit busy=P0^7;
char i,j,temp,num,num_1;
long a,b,c;
float a_c,b_c;
uchar flag,fuhao;
uchar code table[]={7,8,9,0,4,5,6,0,1,2,3,0,0,0,0,0};
uchar code table1[]={7,8,9,0x2f-0x30,4,5,6,0x2a-0x30,1,2,3,0x2d-0x30,0x01-0x30,0,0x3d-0x30,0x2b-0x30};
void delay(uchar z)
{
uchar y;
for(z;z>0;z--)
for(y=0;y<110;y++);
}
void check()
{
do{
P0=0xFF;
rs=0;
rw=1;
e=0;
delay(1);
e=1;
}while(busy==1);
}
void write_com(uchar com)
{
P0=com;
rs=0;
rw=0;
e=0;
check();
e=1;
}
void write_date(uchar date)
{
P0=date;
rs=1;
rw=0;
e=0;
check();
e=1;
}
void init()
{
num=-1;
e=1;
write_com(0X01);
delay(1);
write_com(0x38);
delay(1);
write_com(0x0c);
delay(1);
write_com(0x06);
delay(1);
write_com(0x80);
delay(1);
write_com(0x01);
delay(1);
num_1=0;
i=0;
j=0;
a=0;
b=0;
c=0;
flag=0;
fuhao=0;
}
while(P3!=0xf7);
switch(num)
{
case 12:{write_com(0x01);a=0;b=0;flag=0;fuhao=0;}//????"??"
break;
case 13:
{
if(flag==0)
{
a=a*10;
write_date(0x30);
P1=0;
}
else if(flag==1)//???????
{
b=b*10;
write_date(0x30);
}
}
break;
case 14:{j=1;
if(fuhao==1){write_com(0x80+0x4f);//?????,???????????????
write_com(0x04); //?????????,???????,??????
c=a+b;
while(c!=0)
{
write_date(0x30+c%10);
c=c/10;
}
write_date(0x3d); //??"="
a=0;b=0;flag=0;fuhao=0;
}
else if(fuhao==2){write_com(0x80+0x4f);//???????????????
write_com(0x04); //?????????,???????,??????(?????????,????????)
if(a-b>0)
c=a-b;
else
c=b-a;
while(c!=0)
{
write_date(0x30+c%10);
c=c/10;
}
if(a-b<0)
write_date(0x2d);
write_date(0x3d); //??"="
a=0;b=0;flag=0;fuhao=0;
}
else if(fuhao==3){write_com(0x80+0x4f);
write_com(0x04);
c=a*b;
while(c!=0)
{
write_date(0x30+c%10);
c=c/10;
}
write_date(0x3d);
a=0;b=0;flag=0;fuhao=0;
}
else if(fuhao==4){write_com(0x80+0x4f);
write_com(0x04);
i=0;
c=(long)(((float)a/b)*1000);
while(c!=0)
{
write_date(0x30+c%10);
c=c/10;
i++;
if(i==3)
write_date(0x2e);
}
if(a/b<=0)
write_date(0x30);
write_date(0x3d);
a=0;b=0;flag=0;fuhao=0;
}
}
break;
case 15:{write_date(0x30+table1[num]);flag=1;fuhao=1;}
break;
}
}
}
main()
{
init();
while(1)
{
keyscan();
}
}
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