基于51单片机的简易计算器.docx
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基于51单片机的简易计算器
基于51单片机的简易计算器
/****************************************************************
阿斌独家制作:
计算器数码管显示
可计算10以下数加减乘除
可连续运算最大显示结果数值9999
*****************************************************************/
键盘设置:
主程序:
#include
#defineuintunsignedint
#defineucharunsignedchar
ucharnum,temp,jia=0,jian=0,cheng=0,chu=0,qing=0;
uintkey,key1;
uchartable[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x0};
voiddelay(uintz)
{
uintx,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
voidkeyscan()
{
P3=0xfe;
temp=P3;
temp=temp&0xf0;
while(temp!
=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!
=0xf0)
{
temp=P3;
switch(temp)
{
case0xee:
key=1;num=0;break;
case0xde:
key=2;num=0;break;
case0xbe:
key=3;num=0;break;
case0x7e:
num=1;break;//加号
}
while(temp!
=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
while(temp!
=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!
=0xf0)
{
temp=P3;
switch(temp)
{
case0xed:
key=4;num=0;break;
case0xdd:
key=5;num=0;break;
case0xbd:
key=6;num=0;break;
case0x7d:
num=2;break;//减号
}
while(temp!
=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xfb;
temp=P3;
temp=temp&0xf0;
while(temp!
=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!
=0xf0)
{
temp=P3;
switch(temp)
{
case0xeb:
key=7;num=0;break;
case0xdb:
key=8;num=0;break;
case0xbb:
key=9;num=0;break;
case0x7b:
num=3;break;//乘号
}
while(temp!
=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xf7;
temp=P3;
temp=temp&0xf0;
while(temp!
=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!
=0xf0)
{
temp=P3;
switch(temp)
{
case0xe7:
key=0;num=0;break;
case0xd7:
num=6;break;//清除
case0xb7:
num=5;break;//等于号
case0x77:
num=4;break;//除号
}
while(temp!
=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
}
voiddisplay(uintshu)
{
uintqian,bai,shi,ge;
qian=shu/1000;
bai=shu%1000/100;
shi=shu%100/10;
ge=shu%10;
P2=0x1f;
if(qian==0)
P0=table[10];
else
P0=table[qian];
delay(5);
P2=0x2f;
if(qian==0&&bai==0)
P0=table[10];
else
P0=table[bai];
delay(5);
P2=0x4f;
if(qian==0&&bai==0&&shi==0)
P0=table[10];
else
P0=table[shi];
delay(5);
P2=0x8f;
P0=table[ge];
delay(5);
}
voidjia1()
{
jia=1;
jian=cheng=chu=qing=0;
key1=key;
}
voidjian1()
{
jian=1;
jia=cheng=chu=qing=0;
key1=key;
}
voidcheng1()
{
cheng=1;
jia=jian=chu=qing=0;
key1=key;
}
voidchu1()
{
chu=1;
jia=jian=cheng=qing=0;
key1=key;
}
voidqing1()
{
qing=1;
jia=jian=cheng=chu=0;
key1=key=0;
}
voiddeng1()
{
if(jia)
key=key1+key;
if(jian)
key=key1-key;
if(cheng)
key=key1*key;
if(chu)
key=key1/key;
display(key);
jia=jian=cheng=chu=qing=0;
}
voiddeal()
{
switch(num)
{
case0:
display(key);break;
case1:
jia1();break;
case2:
jian1();break;
case3:
cheng1();break;
case4:
chu1();break;
case5:
deng1();break;
case6:
qing1();break;
}
}
voidmain()
{
P2=0x0f;
while
(1)
{
keyscan();
deal();
}
}