INT8U Init_lwIP(void)
{
    struct ip_addr ipaddr;
    struct ip_addr netmask;
    struct ip_addr gw;
    uint8_t macaddress[6] = {0};//{ g_systmp.chipid[5], g_systmp.chipid[4], g_systmp.chipid[3], g_systmp.chipid[2], g_systmp.chipid[1], g_systmp.chipid[0] };
        sys_sem_t sem;
        INT8U i = 0;
       
        //éèÖÃmacμØÖ·
        for( i = 0; i < 6 ; i++)
        {
                macaddress[i] = g_systmp.chipid[i];
        }       
   
   
    sys_init();
   
    /* Initializes the dynamic memory heap defined by MEM_SIZE.*/
    mem_init();
   
    /* Initializes the memory pools defined by MEMP_NUM_x.*/
    memp_init();
   
    pbuf_init();       
    netif_init();
   
        USART_Configuration();

    printf("TCP/IP initializing... ");
    sem = sys_sem_new(0);
    tcpip_init(TcpipInitDone, &sem);
    sys_sem_wait(sem);
    sys_sem_free(sem);
    printf("TCP/IP initialized. ");
      
#if LWIP_DHCP
    /* &#198;&#244;ó&#195;DHCP·t&#206;&#241;&#198;÷ */
    ipaddr.addr = 0;
    netmask.addr = 0;
    gw.addr = 0;
#else
    /* &#198;&#244;ó&#195;&#190;2ì&#172;IP */
    IP4_ADDR(&ipaddr, emacIPADDR0, emacIPADDR1, emacIPADDR2, emacIPADDR3 );
    IP4_ADDR(&netmask,emacNET_MASK0, emacNET_MASK1, emacNET_MASK2, emacNET_MASK3 );
    IP4_ADDR(&gw, emacGATEWAY_ADDR0, emacGATEWAY_ADDR1, emacGATEWAY_ADDR2, emacGATEWAY_ADDR3 );
#endif
   
    Set_MAC_Address(macaddress);
   
    netif_add(&netif, &ipaddr, &netmask, &gw, NULL, &ethernetif_init, &tcpip_input);
    netif_set_default(&netif);
          
#if LWIP_DHCP
    dhcp_start(&netif);
#endif
        /* read the new IP address */
        if(netif.ip_addr.addr != 0)
                IPaddress = netif.ip_addr.addr;
       
    netif_set_up(&netif);
       
        return UDP_INIT;
}
代码如下，可以ping通，路由器也可以看到这个ip，用芯片ID做的mac，就是ip一直显示0，奇怪了，