数码管端口：P0
#include <reg52.h>
#define SMG_A_DP_PORT P0 //定义数码管使用P0端口
char gsmg_code[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};//共阴0~F 断码数据
void main()
{
SMG_A_DP_PORT=gsmg_code[0];
while(1)
{
}
}