请支持原创，谢谢
1、电路图
2、程序：
/***********************************************************************************************************design by DX from GDOU**************************** **********************************************************/
#include
#include
#define uint8 unsigned char
sbit led1=P1^0;
sbit led2=P1^1;
sbit led3=P1^2;
sbit led4=P1^3;
long int count1,count2; //存放上次的输入和现在的输入
uint8 symbol,p; //存放符号的数值 p 用于多数输入清屏作用
long int outputcount; //存放结果
uint8 KeyCodeTable[]={0x28,0x14,0x24,0x44,0x12,0x22,0x42,0x11,0x21,0x41,
0x18,0x88,0x84,0x82,0x81,0x48}; //键盘按键特征表
int table[]={0XC0,0XF9,0XA4,0XB0,0X99,0X92,0X82,0XF8,0X80,0X90} ;//不懂
uint8 a[4];
void init()
{
uint8 j;
a[0]=0xc0;
for(j=1;j
{
a[j]=0xff;
}
count1=0;
count2=0;
symbol=0;
p=0;
outputcount=0;
}
void delayms(int x) //延时程序
{
uint8 i;
while(x--) for(i=0;i
}
void display() //LED显示
{
P0 = a[0];
led1=0;
delayms(5);
led1=1;
P0 = a[1];
led2=0;
delayms(5);
led2=1;
P0 = a[2];
led3=0;
delayms(5);
led3=1;
P0 = a[3];
led4=0;
delayms(5);
led4=1;
}
uint8 keyscan() //键盘扫描
{
uint8 sCode,kCode,i,k;
P2=0xf0;
if((P2&0xf0)!=0xf0)
{
delayms(2); //软件去抖
if((P2&0xf0)!=0xf0)
{
sCode=0xfe;
for(k=0;k
{
P2=sCode;
delayms(12);
if((P2&0xf0)!=0xf0)
{
kCode=~P2;
for(i=0;i
if(kCode==KeyCodeTable[i])
return(i);
}
else
sCode=_crol_(sCode,1);
}
}
}
return(100); //没按键输入
}
void output(long int x)
{
int i;
uint8 j=0;
uint8 z[3]={0,0,0} ;
if(x>=1000)
{ i=x/1000;
z[0]=i;
a[j]=table[i];
j++; }
if(x>=100)
{ i=(x-z[0]*1000)/100;
z[1]=i;
a[j]= table[i];
j++; }
if(x>=10)
{ i=(x-z[0]*1000-z[1]*100)/10;
z[2]=i;
a[j]= table[i];
j++; }
i=x%10;
a[j]=table[i];
}
void Calculate(uint8 key) //计算程序并显示LED
{
uint8 i,j;
static k=0;
if(key
{
if(p)
{
p=0;
for(j=0;j
{
a[j]=0xff;
}
}
a[k]=table[key];
k=++k%4;
count2*=10;
count2+=key;
outputcount=count2; //把当前按下的值先赋给outputcount
}
else if(key==10) //清零键
{ k=0 ;
init();
}
else if(key
{ k=0;
p=1;
switch(symbol) //多则运算时用于把之前的结果赋给COUNT1 {
case 0 :count1=count2 ;break;
case 11:count1+=count2;break;
case 12:count1-=count2;break;
case 13:count1*=count2;break;
case 14:count1/=count2;break;
default: break;
}
count2=0; //有符号输入时把之前的值赋给count1, 并把符号标号赋给symbol;
symbol=key;
}
else
{
switch(symbol)
{
case 11:outputcount=count1+count2;break;
case 12:outputcount=count1-count2;break;
case 13:outputcount=count1*count2;break; case 14:outputcount=count1/count2;break; default:break;
}
for(j=0;j
{
a[j]=0xff;
}
output(outputcount);
}
}
void main()
{
uint8 key;
init();
P0=0xff;
led1=1;
led2=1;
led3=1;
led4=1;
while(1)
{
display();
if((key=keyscan())!=100)
{ while((keyscan())!=100) ;
Calculate(key); }
}
}