#include "reg52.h"
typedef unsigned int u16;
typedef unsigned char u8;
sbit LSA=P2^2;
sbit LSB=P2^3;
sbit LSC=P2^4;
u8 code smgduan[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}
u16 s;
u8 sec,mb[4];
u8 min,fb[2];
void Timer0Init()
{
TMOD|=0X01;//选择为定时器0模式,工作方式1,仅用TR0打开启动。
TH0=0XFC; //给定时器赋初值,定时1ms
TL0=0X18;
TR0=1;//打开定时器
}
void delay(u16 i)
{
while(i--);
}
void DigDisplay()
{
u8 i;
u8 j;
for(j=0;j<2;j++)
{
switch(j) //位选,选择点亮的数码管,
{
case(0):
LSA=0;LSB=0;LSC=0; break;
case(1):
LSA=0;LSB=1;LSC=0; break;
}
}
P0=smgduan[fb[j]];
for(i=2;i<4;i++)
{
switch(i) //位选,选择点亮的数码管,
{
case(2):
LSA=0;LSB=1;LSC=0; break;
case(3):
LSA=1;LSB=1;LSC=0; break;
}
P0=smgduan[mb[i]];//发送段码
delay(1); //间隔一段时间扫描
P0=0x00;//消隐
}
}
/void main()
{
Timer0Init();
while(1)
{
if(TF0==1)
{
TF0=0;
TH0=0XFC; //给定时器赋初值,定时1ms
TL0=0X18;
s++;
}
if(s==1000) //到达1s时间
{
s=0;
sec++;
if(sec==60)
{
sec=0;
min++;
if(min==60)
min=0;
}
}
mb[3]=sec%10;
mb[2]=sec/10;
fb[1]=min%10;
fb[0]=min/10;
DigDisplay();
}
}
这么写前面两个数码管不亮
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