静态数码管

#include <reg51.h>
#include <intrins.h>
typedef unsigned char u8; 
//静态数码管高电平
sbit a = P0^0;
sbit b = P0^1;
sbit c = P0^2;
sbit d = P0^3;
sbit e = P0^4;
sbit f = P0^5;
sbit g = P0^6;
sbit dp = P0^7;
void Sleep()
{
u8 i,j;
for(i = 0; i< 255; ++i)
for(j = 0; j< 255; ++j)
_nop_();
}


/*
a
     ___
 f |    g   | b
   | ___ |
e |         | c
   | ___ | . dp   
      d
*/
void main()
{
u8 i = 1;
while(1)
{
if(i == 1)
{
a = 1;
b = 0;
c = 0;
d = 1;
e = 1;
f = 1;
g = 1;
dp = 1;
}
else if(i == 2)
{
a = 0;
b = 0;
c = 1;
d = 0;
e = 0;
f = 1;
g = 0;
dp = 1;
}
else if(i == 3)
{
a = 0;
b = 0;
c = 0;
d = 0;
e = 1;
f = 1;
g = 0;
dp = 1;
}
else if(i == 4)
{
a = 1;
b = 0;
c = 0;
d = 1;
e = 1;
f = 0;
g = 0;
dp = 1;
}
else if(i == 5)
{
a = 0;
b = 1;
c = 0;
d = 0;
e = 1;
f = 0;
g = 0;
dp = 1;
}
else if(i == 6)
{
a = 1;
b = 1;
c = 0;
d = 0;
e = 0;
f = 0;
g = 0;
dp = 1;
}
else if(i == 7)
{
a = 0;
b = 0;
c = 0;
d = 1;
e = 1;
f = 1;
g = 1;
dp = 1;
}
else if(i == 8)
{
a = 0;
b = 0;
c = 0;
d = 0;
e = 0;
f = 0;
g = 0;
dp = 1;
}
else if(i == 9)
{
a = 0;
b = 0;
c = 0;
d = 0;
e = 1;
f = 0;
g = 0;
dp = 1;
}
++i;
if(i == 10)
i = 1;
Sleep();
}
}

//http://blog.sina.com.cn/s/blog_6b2e32770100wvgl.html