复制代码 代码如下:
#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long
//按键
sbit button=P1^7;
//LED
sbit led2=P3^5;
sbit led3=P3^7;
//数码管位选
sbit c0 = P3^0;
sbit c1 = P3^1;
sbit c2 = P3^2;
sbit c3 = P3^3;
//数码管段码
uchar code dm[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
uchar wm[]={0,0,0,0};
ulong pl;
uchar mode;
void delay3ms(void) //误差 0us
{
unsigned char a,b,c;
for(c=1;c>0;c--)
for(b=176;b>0;b--)
for(a=7;a>0;a--);
}
void smg()
{
static uchar i=0;
c0=1;c1=1;c2=1;c3=1;
P1 = 0XFF;
switch(i)
{
case 0:c0=0;
break;
case 1:c1=0;
break;
case 2:c2=0;
break;
case 3:c3=0;
break;
}
P1 = dm[wm[i]];
i++;
if(i>3)
{
i=0;
}
}
void ledmode()
{
switch(mode)
{
case 0:led2=led3=0;
break;
case 1:led2=1;led3=0;
break;
case 2:led2=0;led3=1;
break;
case 3:led2=led3=1;
break;
}
}
void key()
{
static uchar num;
delay3ms();
button=1;
switch(num)
{
case 0:if(!button)
{
num=1;
}
break;
case 1:if(!button)
{
if(mode<3)
{
mode++;
}
else
{
mode=0;
}
num=2;
}
else
{
num=0;
}
break;
case 2:if(button)num=3;
break;
case 3:if(button)num=0;
break;
}
}
void timeinit()
{
TMOD=0x15; //设置T0T1控制字
TH0=0x00;
TL0=0x00;
TH1=0xfC;
TL1=0x18;
ET0=1; //定时器0中断允许
ET1=1;
TR0=1; //启动T0计数
TR1=1; //并启动T1计数
EA=1; //CPU开中断
}
void main()
{
timeinit();
while(1)
{
smg();
ledmode();
key();
}
}
void t1()interrupt 3
{
static uint time;
TR0=0;
TH1=(65536-10000)/256;
TL1=(65536-10000)%256;
time++;
if(time>99)
{
time=0;
pl=TH0*256+TL0;
wm[0]=(pl/1000)%10;
wm[1]=(pl/100)%10;
wm[2]=(pl/10)%10;
wm[3]=pl%10;
TH0=TL0=0;
}
TR0=1;
}
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