标题: c51单片机简易计算器的源代码 [打印本页]
作者: qaz222 时间: 2022-5-23 17:54
标题: c51单片机简易计算器的源代码
#include<reg51.h>
#define uint unsigned int
#define uchar unsigned char
sbit lcden=P2^0;
sbit rs=P2^2;
sbit rw=P2^1;
sbit busy=P1^7;
char i,j,temp,num;
long a,b,c;
uchar flag,fuhao;
uchar code table[]={
7,8,9,0,
4,5,6,0,
1,2,3,0,
0,0,0,0};
uchar code table1[]={
7,8,9,0x2f-0x30,
4,5,6,0x2a-0x30,
1,2,3,0x2d-0x30,
0x01-0x30,0,0x3d-0x30,0x2b-0x30};
void lcd1602_delay(uint x);
void lcd1602_write_str(uchar *p);
void lcd1602_write_com(uchar com);
void lcd1602_delay1(uint x);
void lcd1602_pos(uchar x,uchar y);
void lcd1602_write_date(uchar date);
void lcd1602_init();
void lcd1602_delay(uint x)
{
uint a,b;
for(a=x;a>0;a--)
for(b=10;b>0;b--);
}
void lcd1602_delay1(uint x)
{
uint a,b;
for(a=x;a>0;a--)
for(b=100;b>0;b--);
}
void lcd1602_write_com(uchar com) //向1602写入命令
{
P1=com;
rs=0;
rw = 0;
lcden=0;
lcd1602_delay(10);
lcden=1;
lcd1602_delay(10);
lcden=0;
}
void lcd1602_pos(uchar x,uchar y) //1602定位
{
uchar pos;
if (x==0)
x=0x80;
else if (x==1)
x=0xc0;
pos = x+y ;
lcd1602_write_com(pos); //显示地址
}
void lcd1602_write_date(uchar date) //向1602写入数据
{
P1=date;
rs=1;
rw=0;
lcden=0;
lcd1602_delay(10);
lcden=1;
lcd1602_delay(10);
lcden=0;
}
void lcd1602_write_str(uchar *p) //向1602写入一个字符串
{
while(*p!='\0')
{
lcd1602_write_date(*p);
p++;
}
}
void lcd1602_init() //1602初始化
{
rw=0;
lcd1602_write_com(0x38);
lcd1602_delay(20);
lcd1602_write_com(0x0c);
lcd1602_delay(20);
lcd1602_write_com(0x06);
lcd1602_delay(20);
lcd1602_write_com(0x01);
lcd1602_delay(20);
num=-1;
lcden=1; //使能信号为高电平
i=0;
j=0;
a=0; //第一个参与运算的数
b=0; //第二个参与运算的数
c=0;
flag=0; //flag表示是否有符号键按下，
fuhao=0; // fuhao表征按下的是哪个符号
}
void delay(uchar z) // 延迟函数
{
uchar y;
for(z;z>0;z--)
for(y=0;y<110;y++);
}
void keyscan() // 键盘扫描程序
{
P3=0xfe;
if(P3!=0xfe)
{
delay(5);
if(P3!=0xfe)
{
temp=P3&0xf0;
switch(temp)
{
case 0xe0:num=0;
break;
case 0xd0:num=1;
break;
case 0xb0:num=2;
break;
case 0x70:num=3;
break;
}
}
while(P3!=0xfe);
if(num==0||num==1||num==2)//如果按下的是'7','8'或'9
{
if(j!=0)
{
lcd1602_write_com(0x01);
j=0;
}
if(flag==0)//没有按过符号键
{
a=a*10+table[num];
}
else//如果按过符号键
{
b=b*10+table[num];
}
}
else//如果按下的是'/'
{
flag=1;
fuhao=4;//4表示除号已按
}
i=table1[num];
lcd1602_write_date(0x30+i);
}
P3=0xfd;
if(P3!=0xfd)
{
delay(5);
if(P3!=0xfd)
{
temp=P3&0xf0;
switch(temp)
{
case 0xe0:num=4;
break;
case 0xd0:num=5;
break;
case 0xb0:num=6;
break;
case 0x70:num=7;
break;
}
}
while(P3!=0xfd);
if(num==4||num==5||num==6&&num!=7)//如果按下的是'4','5'或'6'
{
if(j!=0)
{
lcd1602_write_com(0x01);
j=0;
}
if(flag==0)//没有按过符号键
{
a=a*10+table[num];
}
else//如果按过符号键
{
b=b*10+table[num];
}
}
else//如果按下的是'/'
{
flag=1;
fuhao=3;//3表示乘号已按
}
i=table1[num];
lcd1602_write_date(0x30+i);
}
P3=0xfb;
if(P3!=0xfb)
{
delay(5);
if(P3!=0xfb)
{
temp=P3&0xf0;
switch(temp)
{
case 0xe0:num=8;
break;
case 0xd0:num=9;
break;
case 0xb0:num=10;
break;
case 0x70:num=11;
break;
}
}
while(P3!=0xfb);
if(num==8||num==9||num==10)//如果按下的是'1','2'或'3'
{
if(j!=0)
{
lcd1602_write_com(0x01);
j=0;
}
if(flag==0)//没有按过符号键
{
a=a*10+table[num];
}
else//如果按过符号键
{
b=b*10+table[num];
}
}
else if(num==11)//如果按下的是'-'
{
flag=1;
fuhao=2;//2表示减号已按
}
i=table1[num];
lcd1602_write_date(0x30+i);
}
P3=0xf7;
if(P3!=0xf7)
{
delay(5);
if(P3!=0xf7)
{
temp=P3&0xf0;
switch(temp)
{
case 0xe0:num=12;
break;
case 0xd0:num=13;
break;
case 0xb0:num=14;
break;
case 0x70:num=15;
break;
}
}
while(P3!=0xf7);
switch(num)
{
case 12:{lcd1602_write_com(0x01);a=0;b=0;flag=0;fuhao=0;}//按下的是"清零"
break;
case 13:{ //按下的是"0"
if(flag==0&a!=0)//没有按过符号键
{
a=a*10;
lcd1602_write_date(0x30);
}
else if(flag==1&b!=0)//如果按过符号键
{
b=b*10;
lcd1602_write_date(0x30);
}
else
{
lcd1602_pos(0,0); lcd1602_write_str("0");
}
}
break;
case 14:{j=1;
if(fuhao==1){lcd1602_pos(1,16); lcd1602_write_com(0x04);
c=a+b;
if((c>=-99999999)&&(c<=99999999))
{
while(c!=0)
{
lcd1602_write_date(0x30+c%10);
c=c/10;
}
lcd1602_write_date(0x3d); //再写"="
a=0;b=0;flag=0;fuhao=0;
}
else
{
lcd1602_pos(1,11); lcd1602_write_str("RORRE");
}
}
else if(fuhao==2){lcd1602_pos(1,16); lcd1602_write_com(0x04);
if((a-b)>0)
c=a-b;
else
c=b-a;
if((c>=-99999999)&&(c<=99999999))
{
while(c!=0)
{
lcd1602_write_date(0x30+c%10);
c=c/10;
}
if((a-b)<0)
lcd1602_write_date(0x2d);
lcd1602_write_date(0x3d); //再写"="
a=0;b=0;flag=0;fuhao=0;
}
else
{
lcd1602_pos(1,11); lcd1602_write_str("RORRE");
}
}
else if(fuhao==3){lcd1602_pos(1,16); lcd1602_write_com(0x04);
c=a*b;
if((c>=-99999999)&&(c<=99999999))
{
while(c!=0)
{
lcd1602_write_date(0x30+c%10);
c=c/10;
}
lcd1602_write_date(0x3d);
a=0;b=0;flag=0;fuhao=0;
}
else
{
lcd1602_pos(1,11); lcd1602_write_str("RORRE");
}
}
else if(fuhao==4){lcd1602_pos(1,16); lcd1602_write_com(0x04);
i=0;
c=(long)(((float)a/b)*1000);
if((c>=-99999999)&&(c<=99999999))
{
while(c!=0)
{
lcd1602_write_date(0x30+c%10);
c=c/10;
i++;
if(i==3)
lcd1602_write_date(0x2e);
}
if(a/b<=0)
lcd1602_write_date(0x30);
lcd1602_write_date(0x3d);
a=0;b=0;flag=0;fuhao=0;
}
else
{
lcd1602_pos(1,11); lcd1602_write_str("RORRE");
}
}
}
break;
case 15:{lcd1602_write_date(0x30+table1[num]);flag=1;fuhao=1;}
break;
}
}
}
main()
{ unsigned int i;
lcd1602_init();
lcd1602_pos(0,1);
lcd1602_write_str("C51 calculator");
lcd1602_pos(1,1);
lcd1602_write_str("By sdju BG0801");
for(i=10000;i>0;i++);
for(i=10000;i>0;i++);
for(i=10000;i>0;i++);
for(i=10000;i>0;i++);
for(i=10000;i>0;i++);
for(i=10000;i>0;i++);
for(i=10000;i>0;i++);
for(i=10000;i>0;i++);
lcd1602_init();
while(1)
{
keyscan();
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