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#include<reg52.h>
#include<math.h>
#define unchar unsigned char
#define unint unsigned int
#define Pi 3.141596
sbit rs=P2^0;
sbit rw=P2^1;
sbit en=P2^2;
sbit busy=P0^7;
char i,j,flag,fuhao,y,r,z;
char s[30];
unchar num,temp;
long a,b,c;
unchar code table[]={7,8,9,0,//內部運算用
4,5,6,0,
1,2,3,0,
0,0,0,0,
0,0,0,0,
0,0,0,0,
0,0,0,0};
unchar code table1[]={7,8,9,0x2f-0x30,//顯示用7，8，9，/,//后面加了0x30，所以這里減掉
4,5,6,0x2a-0x30,//4,5,6,*
1,2,3,0x2d-0x30,//1,2,3,-
0x01-0x30,0,0x3d-0x30,0x2b-0x30,//ON/C,0,=,+
0x22-0x30,0x5e-0x30,0x25-0x30,0x21-0x30,//"代表根號，^次方，%，！
0x02-0x30,0x03-0x30,0x04-0x30,//2轉10，10轉2，10轉16，16轉10
0x05-0x30,0x06-0x30,0x07-0x30,0x08-0x30};//sin,coa,tan,ln
void delay(unchar z)
{
unchar x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void checkbusy()
{
while(busy==1)//P0^7最高位為1為忙，0為閑
{
P0=0xff;
rs=0;
rw=1;
en=0;//禁止讀寫
delay(20);
en=1;
}
}
void write_com(unchar com)
{
rs=0;
rw=0;
en=0;
checkbusy();
P0=com;
delay(5);
en=1;
delay(5);
en=0;
}
void write_date(unchar date)
{
rs=1;
rw=0;
en=0;
checkbusy();
P0=date;
delay(5);
en=1;
delay(5);
en=0;
}
void init()
{
write_com(0x38);//16*2顯示，5*7點陣，8位數據接口
delay(50);
write_com(0x0c);//開顯示關光標和閃爍
delay(50);
write_com(0x06);//地址向后移
delay(50);
write_com(0x80);//光標初始地址
write_com(0x01);//清屏
delay(50);
i=0;flag=0;//賦初值flag表示按符號鍵后的輸入值，默認為沒按之前的輸入
fuhao=0;a=0;b=0;c=0;
}
void lcd_clean()//清屏
{
write_com(0x01);
delay(20);
}
void keyscan()
{
//**************P3口的鍵盤檢測
P3=0xfe;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{ delay(10);
temp=P3;
temp=temp&0xf0;
if(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(P3!=0xfe);
if(num==0||num==1||num==2)
{
if(flag==0)
a=a*10+table[num];//a是在沒按符號鍵之前輸入的值
if(flag==1)
b=b*10+table[num];//b是按符號鍵后輸入的值
}
if(num==3)//"/"除鍵
{
flag=1;
fuhao=4;//"/"
}
i=table1[num];//顯示的值
write_date(0x30+i);//十六進制表示的ASC碼
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{ delay(5);
temp=P3;
temp=temp&0xf0;
if(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(P3!=0xfd);
if(num==4||num==5||num==6)
{
if(flag==0)
a=a*10+table[num];
else
b=b*10+table[num];
}
if(num==7)//"*"乘
{
flag=1;
fuhao=3;
}
i=table1[num];
write_date(0x30+i);
}
P3=0xfb;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{ delay(5);
temp=P3;
temp=temp&0xf0;
if(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(P3!=0xfb);
if(num==8||num==9||num==10)
{
if(flag==0)
{a=a*10+table[num];}
else
{b=b*10+table[num];}
}
if(num==11)//"-"減
{
flag=1;
fuhao=2;
}
i=table1[num];
write_date(0x30+i);
}
P3=0xf7;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{ delay(5);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xe7:num=12; break;
case 0xd7:num=13; break;
case 0xb7:num=14; break;
case 0x77:num=15; break;
}
}
while(P3!=0xf7);//松手檢測，沒有松手則保持顯示的狀態
switch(num)
{
case 12:{
lcd_clean();
a=0;b=0;flag=0;
fuhao=0;
} break;
case 13:{
if(flag==0)
{
a=a*10;write_date(0x30);
}
else
{
b=b*10;
write_date(0x30);
}
} break;
case 14:{//需要按"="的
if(fuhao==1)
{
write_com(0x80+0x0f);
lcd_clean();//重新定位后再清屏
write_com(0x04); i=0;
c=a+b;
while(c!=0)
{
write_date(0x30+c%10);
c=c/10;
}
write_date(0x3d);//寫"="
a=0;b=0;flag=0;fuhao=0;//清0
}
else if(fuhao==2)
{
write_com(0x80+0x0f);
lcd_clean();
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);//"-"減
write_date(0x3d);
a=0;b=0;flag=0;fuhao=0;
}
else if(fuhao==3)
{
write_com(0x80+0x0f);
lcd_clean();
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+0x0f);
lcd_clean();
write_com(0x04);
i=0;
c=(long)(((float)a/b)*1000);//化整后再加小數點
while(c!=0)
{
write_date(0x30+c%10);
c=c/10; i++;
if(i==3)
write_date(0x2e);//加小數點"."
}
if(a/b<=0)
write_date(0x30);
write_date(0x3d);
a=0;b=0;flag=0;fuhao=0;
}
else if(fuhao==5)
{
write_com(0x80+0x0f);
lcd_clean();
write_com(0x04);
c=(long)(pow((float)a,(float)1/b)*1000);
i=0;
while(c!=0)
{
write_date(0x30+c%10);
c=c/10;
i++;
if(i==3)
write_date(0x2e);
}
write_date(0x3d);
a=0;b=0;flag=0;fuhao=0;
}
else if(fuhao==6)
{
write_com(0x80+0x0f);
lcd_clean();
write_com(0x04);
c=pow((float)a,(float)b);//c52內部的函數
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==7)
{
write_com(0x80+0x0f);
lcd_clean();
write_com(0x04);
c=a%b;
if(c==0)
write_date(0x30);
while(c>0)
{
write_date(0x30+c%10);
c=c/10;
}
write_date(0x3d);
a=0;b=0;flag=0;fuhao=0;
}
} break;
case 15:{
i=table1[num];
write_date(0x30+i);//"+"加
flag=1;fuhao=1;
} break;
}
}
//*********************P1口的鍵盤檢測
P1=0xfe;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{ delay(5);
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xee:num=16; break;
case 0xde:num=17; break;
case 0xbe:num=18; break;
case 0x7e:num=19; break;
}
}
while(P1!=0xfe);
switch(num)
{
case 16:{
i=table1[num];
write_date(0x30+i);//"x開y次方
flag=1;fuhao=5;
} break;
case 17:{
i=table1[num];
write_date(0x30+i);//"^"x的y次方
flag=1;fuhao=6;
} break;
case 18:{
i=table1[num];
write_date(0x30+i);//"%"求余
flag=1;fuhao=7;
} break;
case 19:{//單獨出來不用按"="號得結果
unsigned long int c_1;
i=table1[num];
write_date(0x30+i);
fuhao=8;//"!"階乘
write_com(0x80+0x0f);
lcd_clean();
write_com(0x04);
c_1=1;
for(i=1;i<=a;i++)//a的最大值為12，13時已經超出了無符號長整型的范圍無法計算
c_1=c_1*i;
while(c_1!=0)
{
write_date(0x30+c_1%10);
c_1=c_1/10;
}
write_date(0x3d);
a=0;fuhao=0;
} break;
}
}
P1=0xfd;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{ delay(5);
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xed:num=20; break;
case 0xdd:num=21; break;
case 0xbd:num=22; break;
case 0x7d:num=23; break;
}
}
while(P1!=0xfd);
switch(num)
{
case 20:{
write_com(0x80+0x0f);
lcd_clean();
write_com(0x04);
j=0;i=0;c=0;fuhao=9;//2進制轉10進制
while(a!=0)
{
r=a%10;
s[i++]=r;
a=a/10;
}
for(j=i-1;j>=0;j--)
{
c=c*2+s[j];
}
while(c!=0)
{
write_date(0x30+c%10);
c=c/10;
}
write_date(0x3d);
c=0;a=0;fuhao=0;
} break;
case 21:{
write_com(0x80+0x0f);
lcd_clean();
write_com(0x04);
i=0; fuhao=10;//10進制轉2進制
while(a!=0)
{
r=a%2;
write_date(0x30+r);
y=a/2;
a=y;
}
write_date(0x3d);
a=0;fuhao=0;
} break;
case 22:{
write_com(0x80+0x0f);
lcd_clean();
write_com(0x04);
fuhao=11;//10進制轉16進制
while(a!=0)
{
r=a%16;//循環求余
if(r>=0&&r<=9)//一位一位輸出
write_date(0x30+r);
if(r>=10&&r<=15)
write_date(0x57+r);
y=a/16;
a=y;
}
write_date(0x78);
write_date(0x30);
write_date(0x3d);
a=0;fuhao=0;
} break;
case 23:{
write_com(0x80+0x0f);
lcd_clean();
write_com(0x04);
j=0;i=0;c=0;fuhao=12;//2進制轉16進制
while(a!=0)
{
r=a%10;
s[i++]=r;
a=a/10;
}
for(j=i-1;j>=0;j--)//2進制先轉為10進制
{
c=c*2+s[j];
}
while(c!=0)
{
r=c%16;
if(r>=0&&r<=9)
write_date(0x30+r);//得到的10進制再轉為16進制
if(r>=10&&r<=15)
write_date(0x57+r);
y=c/16;
c=y;
}
write_date(0x78);
write_date(0x30);
write_date(0x3d);
a=0;c=0;fuhao=0;
} break;
}
}
P1=0xfb;
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{ delay(5);
temp=P1;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xeb:num=24; break;
case 0xdb:num=25; break;
case 0xbb:num=26; break;
case 0x7b:num=27; break;
}
}
while(P1!=0xfb);
switch(num)
{
case 24:{
write_date(0x53);
write_date(0x69);
write_date(0x6e);
write_com(0x80+0x0f);
lcd_clean();
write_com(0x04);
fuhao=13;i=0;//sin
if(a>=0&&a<=360)
{
c=(long)((sin((float)a*Pi/180))*1000);
while(c!=0)
{
write_date(0x30+c%10);
c=c/10;i++;
if(i==3)
write_date(0x2e);
}
write_date(0x30);
write_date(0x3d);
i=0;fuhao=0;a=0;c=0;
}
} break;
case 25:{
write_date(0x43);
write_date(0x6f);
write_date(0x73);
write_com(0x80+0x0f);
lcd_clean();
write_com(0x04);
fuhao=14;i=0;//cos
if(a>=0&&a<=360)
{
c=(long)((cos((float)a*Pi/180))*1000);
……………………
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