/* */
/* 2007/12/21 小型三位计算器 */
/* */
#include <reg52.H>
#include <math.H>
//#include <stdio.H>
//#define unchar unsigned char
//#define unint unsigned int
#define in_right 1
#define in_flase 0
#define key_flase 1
sbit LCDE=P2^2;
sbit LCDRW=P2^1;
sbit LCDRS=P2^0;
sbit wink=P1^5;
unsigned char division_i;
unsigned long frist_number; //第一位数的值
unsigned long second_number; //第二位的值
unsigned long result; //运算结果
unsigned char digit;//总的数值的显示位数
unsigned char frist_digit;//第一位数字
unsigned char second_digit;//第二位数字
//unsigned char countmark; //如果有运算键按下置位
//unsigned char display_position; //显示位
unsigned char result_display;
bit gameover;
bit countend;
bit negative;
bit decimal;
bit over_range;
bit division; //除号
bit subtraction; //减号
bit addition; //加号
bit multiplication; //乘号
bit error; //开始时不能显示运算符号
bit number_second; //第二位运算数值位
unsigned char mark[16]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x2b,0x2d,0x2a,0x2f,0x3d,0x5f};// 0.1.2.3.4.5.6.7.8.9.+.-.*./.=..
unsigned char logo_error[5]={0x65,0x72,0x72,0x6f,0x72};//display error
unsigned char logo_range[10]={0x6f,0x76,0x65,0x72,0x20,0x72,0x61,0x6d,0x67,0x65};//over range
void initial();
void key_check();
void display_error();
void frist_display(unsigned char display_sign,mark1); //第一行显示
void second_display(unsigned char display_result,mark2);//第二行显示
void refresh_display();
void lcd_control();
void delays();
void delayl();
void display_lcd();
void number_key();
void count_result( );
void compare_result();
void main()
{
// unsigned char display_sign;
negative=0;
decimal=0;
gameover=1;
division=0; //除号
subtraction=0; //减号
addition=0; //加号
multiplication=0; //乘号
error=1; //开始时不能显示运算符号
number_second=1; //第二位运算数值位
digit=0;
//over_range=0;
frist_number=0;
second_number=0;
result=0;
countend=1;
//all_number=0;
P0=0xff;
P3=0xff;
// input_data=0;
// count_sign=0;
initial();
//frist_display(0,0);
//result_display(0,0);
for(; ;)
{
if(gameover)
{
if(countend==1)
{
key_check();
}
else
{
delays();
delays();
delays();
delays();
delays();
count_result( );
gameover=0;
}
}
else
{
}
}
}
void initial()
{
delayl();
LCDE=0;
LCDRW=0;
LCDRS=0;
delayl();
P0=0x01;
lcd_control();
P0=0x06; //
lcd_control();
P0=0x38; //ac 自动增加 画面动 设置输入方式
lcd_control();
P0=0x14; // 设置显示方式
lcd_control();
P0=0x0c;
lcd_control();
delayl();
}
void frist_display(unsigned char display_sign,mark1)
{
//mark1=0;
LCDE=0;
LCDRW=0;
LCDRS=0;
//P0=0x1c;
//lcd_control();
//P0=0x06;
//lcd_control();
P0=(0x80+mark1);
lcd_control();
LCDE=0;
LCDRW=0;
LCDRS=1;
P0=mark[display_sign];
lcd_control();
digit=digit+1;
if( number_second ) //number_second=0 是按运算符号键后
{
//digit=digit+1;
frist_digit=digit-1;
if (display_sign<10)
{
frist_number=((frist_number*10)+display_sign);
wink=0;
delays();
delays();
delays();
delays();
delays();
delays();
delays();
delays();
delays();
delays();
delays();
delays();
delays();
delays();
}
else
{}
}
else
{
if (countend)
{
second_number=((second_number*10)+display_sign);
}
else
{
second_digit=(digit-frist_digit-2);
}
}
}
void second_display(unsigned char display_result,mark2)
{
delayl();
delayl();
delayl();
LCDE=0;
LCDRW=0;
LCDRS=0;
//P0=0x3d;
//lcd_control();
P0=(0xc0+mark2);
lcd_control();
LCDE=0;
LCDRW=0;
LCDRS=1;
P0=mark[display_result];
lcd_control();
delayl();
delayl();
}
void key_check() //键盘扫描
{
unsigned char key,allkey,keysign,scankey;
P1=0xff;
P3=0xff;
scankey=0;
if( ((P1&0x1f)!=0x1f)&(~error) )
{
delays();
delays();
delays();
keysign=P1&0x1f;
switch(keysign)
{
case 0x0f:
{
addition=1;
error=1;
frist_display(10,digit);
number_second=0;
}
break;
case 0x17:
{
subtraction=1;
error=1;
frist_display(11,digit);
number_second=0;
}
break;
case 0x1b:
{
multiplication=1;
error=1;
frist_display(12,digit);
number_second=0;
}
break;
case 0x1d:
{
division=1;
error=1;
frist_display(13,digit);
number_second=0;
}
break;
case 0x1e:
{
countend=0;
error=1;
frist_display(14,digit);
}
break;
default: ;
}
}
else if ((P3&0x7c)!=0x7c)
{
allkey=P3&0x7c;
P3=0xfd;
if ((P3&0x7c)!=0x7c)
{
key=1;
}
else
{
key=0;
}
delays();
delays();
delays();
delays();
delays();
delays();
delays();
delays();
delays();
delays();
P3=0xff;
if ((P3&0x7c)==0x7c)
{
switch(allkey)
{
case 0x3c:
{
scankey=0+key;
frist_display(scankey,digit);
error=0;
}
break;
case 0x5c:
{
scankey=2+key;
frist_display(scankey,digit);
error=0;
}
break;
case 0x6c:
{
scankey=4+key;
frist_display(scankey,digit);
error=0;
}
break;
case 0x74:
{
scankey=6+key;
frist_display(scankey,digit);
error=0;
}
break;
case 0x78:
{
scankey=8+key;
frist_display(scankey,digit);
error=0;
}
break;
default: ;
}
}
else
{ }
}
else {}
}
void count_result()
{
unsigned char sum=1;
unsigned long compare;
if (addition)
{
result=(frist_number+second_number);
compare_result();
}
else if (subtraction)
{
if(second_number>frist_number)
{
negative=1;
result=(second_number-frist_number);
second_display(11,0);
compare_result();
}
else
{
result=(frist_number-second_number);
compare_result();
}
}
else if (multiplication)
{
result=frist_number*second_number;
compare_result();
}
else if (division)
{
if(second_number>frist_number)
{
division_i=second_digit-frist_digit;
while (division_i>0)
{
sum=sum*10;
division_i--;
}
compare=frist_number*sum;
if (compare<second_number)
{
sum=sum*10;
division_i=division_i+1;
}
else
{
}
result=(compare)/second_number;
compare_result();
}
else
{
result=frist_number/second_number;
compare_result();
}
}
else
{
}
}
void compare_result()
{
unsigned char i;
unsigned long x,y,z;
y=z=result;
if (result>0)
{
i=15;
do
{
x=(z%10);
second_display(x,i);
z=z/10;
i=i-1;
}
while(z>0);
if (division_i)
{
while(division_i>0)
{
second_display(0,division_i);
division_i--;
}
}
else
{
}
}
else if (result==0)
{
second_display(0,15);
}
else
{
// i=2;
// do {
// x=(z%10);
// second_display(x,i);
// z=z/10;
// i=i+1;
// }
// while(i<16);
}
}
void lcd_control()
{
LCDE=1;
delays();
LCDE=0;
delays();
}
void delays()
{
unsigned char i;
for(i=1000;i>0;i--)
{ }
}
void delayl()
{
unsigned char i;
for(i=50;i>0;i--)
{
delays();
}
}