用的是AT89C51
#include<reg51.h>
#include<intrins.h>
void Delay10ms(unsigned int c);
main()
{
unsigned int LED;
LED=0xfe;
while(1)
{
P2=LED;
Delay10ms(50);
LED=LED<<1;
if (P2==0x00)
{
LED=0xff;
}
}
}
void Delay10ms(unsigned int c)
{
unsigned char a, b;
for(;c>0;c--)
{
for(b=38;b>0;b--)
{
for(a=130;a>0;a--);
}
}
}