#include<reg52.h>
sbit pwm=P3^0; //pwm信號輸出
sbit jia=P3^7;//角度增加i/o口
sbit jian=P3^6;//角度減少i/o口
sbit dula=P2^6;
sbit wela=P2^7;
unsigned char jd,count;//角度標識，0.5秒次數標識
unsigned char code table[]={
0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,
0x7c,0x39,0x5e,0x79,0x71};
void delay(unsigned char i)
{
unsigned char k,j;
for(j=i;j>0;j--)
for(k=125;k>0;k--);
}
void timer0_init() //定時器初始化
{
TMOD=0x01;
IE=0x82;//開全局中斷
TH0=0xfe;
TL0=0x33;//11.059赫茲，0.5ms
TR0=1;//定時器開始工作
}
void Time_int()interrupt 1//中斷程序
{
TH0=0xfe;
TL0=0x33;//重新賦值
if(count<jd)
pwm=1;//確實小于，pwm輸出高電平
else
pwm=0;
count=(count+1);//0.5ms的次數加一
count=count%40;//次數始終保持位40,即保持周期為20ms
}
void keyscan()
{
if(jia==0)
{
delay(10);
if(jia==0)
{
jd++; //角度標識加一
count=0; //按鍵按下，則20ms周期重新開始
if(jd==6)
jd=5; //已經是180°，則保持
while(jia==0);
}
}
if(jian==0)
{
delay(10);
if(jian==0)
{
jd--;
count=0;
if(jd==0)
jd=1;
while(jian==0);
}
}
}
void display()
{
unsigned char bai,shi,ge;
switch(jd)
{
case 1:
bai=0;
shi=0;
ge=0;
break;
case 2:
bai=0;
shi=4;
ge=5;
break;
case 3:
bai=0;
shi=9;
ge=0;
break;
case 4:
bai=1;
shi=3;
ge=5;
break;
case 5:
bai=1;
shi=8;
ge=0;
break;
}
dula=0;
P0=table[bai];
dula=1;
dula=0;
wela=0;
P0=0xfe;
wela=1;
wela=0;
delay(5);
P0=table[shi];
dula=1;
dula=0;
wela=0;
P0=0xfd;
wela=1;
wela=0;
delay(5);
P0=table[ge];
dula=1;
dula=0;
wela=0;
P0=0xfb;
wela=1;
wela=0;
delay(5);
}
void main()
{
jd=1;
count=0;
timer0_init();
while(1)
{
keyscan();
display();
}
}
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