51单片机C语言程序（四）键盘 数码管 跑表程序

数码管前三位显示一个跑表，
从000到999之间以1%秒的速度运行，
当按下一个独立键盘时跑表停止，
松开手后跑表继续运行（用定时器设计表）

#include
#include
#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
sbit s2=P3^4;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,
0x76,0x79,0x38,0x3f,0};
uchar flag,t0,ge,shi,bai;
uint shu;
void init();
void display(uchar aa,uchar bb,uchar cc);
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void main()
{
init();
while(1)
{
display(bai,shi,ge);
if(s2==0)
{
delay(10);
if(s2==0)
{
TR0=0;
while(!s2)
display(bai,shi,ge);
TR0=1;
}
}
}
}

void init()
{
TMOD=0x01;
TH0=(65536-10000)/256;
TL0=(65536-10000)%256;
EA=1;
ET0=1;
TR0=1;
}

void timer0() interrupt 1
{
TH0=(65536-10000)/256;
TL0=(65536-10000)%256;
shu++;
if(shu==1000)
shu=0;
bai=shu/100;
shi=shu%100/10;
ge=shu%10;

}

void display(uchar aa,uchar bb,uchar cc)
{
dula=1;
P0=table[aa];
dula=0;
P0=0xff;
wela=1;
P0=0xfe;
wela=0;
delay(1);

dula=1;
P0=table[bb];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delay(1);

dula=1;
P0=table[cc];
dula=0;
P0=0xff;
wela=1;
P0=0xfb;
wela=0;
delay(1);
}

程序二

数码管前三位显示一个跑表，
从000到999之间以1%秒的速度运行，
当按下一个独立键盘时跑表停止，
松开手后跑表继续运行（用定时器设计表）

三个独立键盘实现按下第一个时计时停止，按下第二个
时计时结束，按下第三个是计数值清零从头开始

#include
#include
#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
sbit s2=P3^4;
sbit s3=P3^5;
sbit s4=P3^6;
sbit s5=P3^7;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,
0x76,0x79,0x38,0x3f,0};
uchar flag,t0,ge,shi,bai;
uint shu;
void init();
void display(uchar aa,uchar bb,uchar cc);
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void main()
{
init();
while(1)
{
display(bai,shi,ge);
if(s2==0)
{
delay(10);
if(s2==0)
{
TR0=0;
while(!s2)
display(bai,shi,ge);
TR0=1;
}
}
if(s3==0)
{
delay(10);
if(s3==0)
{
while(!s2)
display(bai,shi,ge);
TR0=0;
}
}
if(s4==0)
{
delay(10);
if(s4==0)
{
while(!s2)
display(bai,shi,ge);
TR0=1;
}
}
if(s5==0)
{
delay(10);
if(s5==0)
{
while(!s2)
display(bai,shi,ge);
shu=0;
}
}
}
}

void init()
{
TMOD=0x01;
TH0=(65536-10000)/256;
TL0=(65536-10000)%256;
EA=1;
ET0=1;
TR0=1;
}

void timer0() interrupt 1
{
TH0=(65536-10000)/256;
TL0=(65536-10000)%256;
shu++;
if(shu==1000)
shu=0;
bai=shu/100;
shi=shu%100/10;
ge=shu%10;

}

void display(uchar aa,uchar bb,uchar cc)
{
dula=1;
P0=table[aa];
dula=0;
P0=0xff;
wela=1;
P0=0xfe;
wela=0;
delay(1);

dula=1;
P0=table[bb];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delay(1);

dula=1;
P0=table[cc];
dula=0;
P0=0xff;
wela=1;
P0=0xfb;
wela=0;
delay(1);
}

程序三

按下16个矩阵键盘依次在数码管上显示
1-16的平方。如按下第一个显示1，
第二个显示4---

#include
#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
sbit key1=P3^4;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
uchar temp;
uint num,num1;
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
uint keyscan();
void display(uchar,uchar,uchar);
void main()
{
dula=1;
P0=0;
dula=0;
wela=1;
P0=0xc0;
wela=0;
while(1)
{
num1=keyscan();
display(num1/100,num1%100/10,num1%10);
}
}
void display(uchar aa,uchar bb,uchar cc)
{
dula=1;
P0=table[aa];
dula=0;
P0=0xff;
wela=1;
P0=0xfe;
wela=0;
delay(1);

dula=1;
P0=table[bb];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delay(1);

dula=1;
P0=table[cc];
dula=0;
P0=0xff;
wela=1;
P0=0xfb;
wela=0;
delay(1);
}
uint keyscan()
{
P3=0xfe;
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xee:num=1;
break;
case 0xde:num=4;
break;
case 0xbe:num=9;
break;
case 0x7e:num=16;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}