51单片机c语言计算器代码
//8位液晶数码管显示的计算器,代码通俗易懂
//用到数码管、矩阵键盘、中断三个模块
#include"reg52.h"
#include"stdio.h"
typedef unsigned char uchar;
typedef unsigned int uint;
sbit Wei = P2^3;//定义"74hc573d锁存器"端口,控制数码管位码;
sbit Duan = P2^2;//定义"74hc573d锁存器"端口,控制数码管段码;
code uchar WeiMa[] = {0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
//共阴数码管点亮位,从第0位到第7位,共8个;
code uint DuanMa[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
0x07,0x7f,0x6f};//共阴数码管显示的值“0~9”;
uchar DuanMaZhi[8];//储存数码管显示值的全局变量;
Timer_0();//数码动态扫描的定时器函数;
Delay(uint t);//按键去抖的延迟函数;
Key_1();//矩阵键盘扫描函数;
Key_2();//矩阵键盘返回值函数;
main()
{
uchar n,i,L,F,T[8],s;
uint a = 0,b = 0;
Timer_0();
DuanMaZhi[0] = DuanMa[0];//复位后数码管显示“0”
while(1)
{
n = Key_2();//变量n存储函数返回值
if(n != 0xff)//检测到有返回值
{
if(i == 0)
{
for(s = 0;s < 8;s++)
DuanMaZhi[s] = 0;//清除缓冲区
}
if((8 == i) || ('+' == n) || ('-' == n) || ('x' == n)
|| ('/' == n) || ('=' == n))//检测到下列符号则代表输
//入结束;
{
i = 0;
if(F == 0) //第一个输入值赋给a;
{
sscanf(T,"%d",&a);//输入值存储到变量a,下同;
F = 1;
}
else
sscanf(T,"%d",&b);
for(s = 0;s < 8;s++)
T[s] = 0;//清除缓存区的值;
if(n != '=')//判断是否为等号,做下标记;
L = n;
else
{
F = 0;
switch(L)//计算操作
{
case '+':a = a + b;break;
case '-':a = a - b;break;
case 'x':a = a * b;break;
case '/':a = a / b;break;
default:break;
}
sprintf(T,"%d",a);
for(s = 0;s < 8;s++)
{
if(T[s] == 0) //如果检测到null,则数码管不显示;
DuanMaZhi[s] = 0;
else if(T[s] == 0x2d) //如果为负号则在段码显示负号;
DuanMaZhi[s] = 0x40;
else
DuanMaZhi[s] = DuanMa[T[s] - '0'];
//从ascall码计算数值
}
L = 0; //全部清零;
a = b = 0;
for(s = 0;s < 8;s++)
T[s] = 0;
}
}
else if(i < 16)
{
T[i] = n + '0';
DuanMaZhi[i] = DuanMa[n];//输出数据;
i++;
}
}
}
}
Key_1()//矩阵键盘翻转扫描
{
uchar i,j;
P1 = 0x0f;
if(P1 != 0x0f)
{
Delay(4500);//去除按键抖动;
if(P1 != 0x0f)
{
i = P1;
P1 = i | 0xf0;
j =