🟢共阳极

🔵共阴极

#include "reg52.h"
typedef unsigned char u8;
typedef unsigned int u16;
unsigned char light[17]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xff};

void delay(u16 i)
{
    while(i--);
}

void main()
{
    u8 k;
    while(1)
    {    
        for(k=0;k<17;k++)
        {
            P2 = light[k];
            delay(50000);
        }
    }
}