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/* 實現兩個數的運算，每個數的位數至少可以八位 */
#include<reg52.h>
#include<math.h>
typedef unsigned char uint8;
typedef unsigned int uint16;
#define GPIO_KEY P1
sbit rw=P2^5;
sbit rs=P2^6;
sbit e=P2^7;
sbit k1=P3^0;
uint8 num='N'; //鍵值
uint16 k0,k2,k3; // 數組位
uint8 fuhao; //定義具體的那個符號，是加減還是乘除。
uint8 flag,r; //定義符號鍵標志位，小數點標志位和繼續運算標志位這個是統稱
float a,b,c,zheng,xiao; //定義運算數據的第一個和第二個及等于的數變量
uint8 shuzi1[5]={0},shuzi2[5]={0},shuzi3[4]={0};
uint8 code dat1[]={1,2,3,0x2b-0x30, 4,5,6,0x2d-0x30, 7,8,9,0x78-0x30, 0,0x2e-0x30,0x3d-0x30,0xfd-0x30 };//保存顯示的數據 123+ 456- 789* 0.CLR /
void delay(uint16 i)
{ uint16 x,y;
for(x=0;x<i;x++)
for(y=0;y<114;y++);
}
void lcdcommand(uint8 m) //寫命令
{
delay(1);
rs=0;
rw=0;
e=0;
P0=m;
e=1;
delay(1);
e=0;
}
void lcddata(uint8 dat) //寫數據
{
delay(1);
rs=1;
rw=0;
e=0;
P0=dat;
e=1;
delay(1);
e=0;
rs=0;
}
void lcdcsh() //初始化
{
delay(5);
lcdcommand(0x38); //功能設定 8位總線兩行 5X7點陣
delay(5);
lcdcommand(0x38);
lcdcommand(0x38);
lcdcommand(0x0c); // 開顯示無光標
lcdcommand(0x06); //光標左移
lcdcommand(0x01); // 清屏
lcdcommand(0x80);//數據從左上開始
num='N';
flag=0;
fuhao=0;
a=0;
b=0;
c=0;
zheng=xiao=0;;
k0=0;k2=0;k3=0;
}
void shuchu(float e) //在屏幕上顯示數值e
{
char shuzu[10];
long z;
int x=0;
float f;
(long)z=e; //整數處理
if(z==0)
lcddata('0');
while(z!=0)
{ shuzu[x]=z%10;
z=z/10;
x++;
}
for(x=x-1;x>=0;x--)
lcddata(shuzu[x]+0x30);
(long)z=e; //小數處理
(float)f=e-z;
if(f>0.000)
{ x=0;
lcddata('.');
z=f*1000;
while(z!=0)
{ shuzu[x]=z%10;
z=z/10;
x++;
}
for(x=x-1;x>=0;x--)
lcddata(shuzu[x]+0x30);
}
}
void fuzhi() // 顯示與向數組賦值
{
if(flag==0) //是否按下符號鍵
{
delay(50);
if(dat1[num]=='.')
r=1;
if((r==0)&&(k0<5))
{
shuzi1[k0]=dat1[num];
k0++;
lcddata(0x30+dat1[num]);
}
else if((r==1)&&(k3<4))
{
shuzi3[k3]=dat1[num];
k3++;
lcddata(0x30+dat1[num]);
}
}
r=0;
if(flag==1) //是否按下符號鍵
{
delay(50);
if(dat1[num]=='.')
r=1;
if((r==0)&&(k2<5))
{
shuzi2[k2]=dat1[num];
k2++;
lcddata(0x30+dat1[num]);
}
else if((r==1)&&(k3<4))
{
shuzi3[k3]=dat1[num];
k3++;
lcddata(0x30+dat1[num]);
}
}
}
void sz(uint8 s[8],int x) //數組轉為數值
{
int i,j;
zheng=0;
xiao=0;
i=0; //整數
while(x>0)
{
zheng=zheng*10+s[i];
i++;
x--;
}
i=1; //小數
j=k3;
while(j>0)
{
xiao=xiao*10+s[i];
i++;
j--;
}
for(;k3>0;k3--)
xiao=xiao/10;
zheng=zheng+xiao;
k0=k2=k3=0;
}
void KeyDown(void)
{
char L=0;
GPIO_KEY=0x0f;
if(GPIO_KEY!=0x0f)//讀取按鍵是否按下
{
delay(10);//延時10ms進行消抖
if(GPIO_KEY!=0x0f)//再次檢測鍵盤是否按下
{
//測試列
GPIO_KEY=0X0F;
switch(GPIO_KEY)
{
case(0X07): num=0;break;
case(0X0b): num=1;break;
case(0X0d): num=2;break;
case(0X0e): num=3;break;
}
//測試行
GPIO_KEY=0XF0;
switch(GPIO_KEY)
{
case(0X70): num=num;break;
case(0Xb0): num=num+4;break;
case(0Xd0): num=num+8;break;
case(0Xe0): num=num+12;break;
}
while((L<50)&&(GPIO_KEY!=0xf0)) //檢測按鍵松手檢測
{
delay(10);
L++;
}
}
}
}
void banduan()
{
switch(fuhao)
{
case 0:
sz(shuzi1,k0);
a=zheng;
lcdcommand(0x01);
lcdcommand(0x40+0x80);
shuchu(a);
b=0;
flag=0;
fuhao=0; //全部清除為0
zheng=0;
xiao=0;
break;
case 1:
lcdcommand(0x40+0x80);
c=a+b;
lcddata(0x3d); //顯示等于號=
shuchu(c);
a=0;
b=0;
flag=0;
fuhao=0; //全部清除為0
zheng=0;
xiao=0;
break;
case 2:
lcdcommand(0x40+0x80);
if(a>b)
{ c=a-b;
lcddata(0x3d); //顯示等于號=
}
else if(a<b)
{
c=b-a;
lcddata(0x3d); //顯示等于號=
lcddata(0x2d); //顯示負號-
}
if(a==b)
c=0;
shuchu(c);
a=0;
b=0;
flag=0;
fuhao=0; //全部清除為0
zheng=0;
xiao=0;
break;
case 3:
lcdcommand(0x40+0x80);
c=a*b;
lcddata(0x3d); //顯示等于號=
shuchu(c);
a=0;
b=0;
flag=0;
fuhao=0; //全部清除為0
zheng=0;
xiao=0;
break;
case 4:
lcdcommand(0x40+0x80);
c=a/b;
lcddata(0x3d); //顯示等號
shuchu(c);
a=0;
b=0;
flag=0;
fuhao=0; //全部清除為0
zheng=0;
xiao=0;
break;
}
}
void main()
{
lcdcsh();
while(1)
{ num='N';
KeyDown();
if(num==13)
{
lcdcommand(0x01);//清零
flag=0;
fuhao=0;
a=0;
b=0;
c=0;
zheng=xiao=0;
k0=k2=k3=0;
}
while(1)
{
num='N';
KeyDown();
if(num==0||num==1||num==2||num==4||num==5||num==6||num==8||num==9||num==10||num==12||num==16) //1-9-0-.
fuzhi();
if(num==13)
{
lcdcommand(0x01);//清零
flag=0;
fuhao=0;
a=0;
b=0;
c=0;
zheng=xiao=0;
k0=k2=k3=0;
break;
}
if(num==3||num==7||num==11||num==15)
{
flag=1;
switch(num)
{ case 3: fuhao=1; break;
case 7: fuhao=2; break;
case 11: fuhao=3; break;
case 15: fuhao=4; break;
}
sz(shuzi1,k0);
c=zheng;
loop: a=c;
lcdcommand(0x01);
lcdcommand(0x80);
shuchu(a);
lcddata(0x30+dat1[num]);
break;
}
}
while(1)
{
num='N';
KeyDown();
if(num==0||num==1||num==2||num==4||num==5||num==6||num==8||num==9||num==10||num==12) //1-9-0
fuzhi();
if(num==13)
{
lcdcommand(0x01);//清零
flag=0;
fuhao=0;
a=0;
b=0;
c=0;
zheng=xiao=0;
k0=k2=k3=0;
break;
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